| Doping Asymmetry Problem in ZnO: Current Status and Outlook. A Review of Experimental and Theoretical Efforts Focused on Achieving P-Type ZnO Suitable for Light-Emitting Optoelectronic Devices for the Blue/Ultraviolet Spectral Range |
24-Apr-2009 |
12 pages |
| Authors:
Hadis Morkoc; Vitaliy Avrutin; Donald Silversmith; VIRGINIA COMMONWEALTH UNIV RICHMOND
|
 | ZnO has gained considerable interest recently as a promising material for a variety of applications. To a large extent, the renewed interest in ZnO is fueled by its wide direct band gap (3.3 eV at room temperature) and large exciton binding energy (60 meV) making this material, when alloyed with e.g. Cd and Mg, especially attractive for light emitters in the blue/UV spectral region. Unfortunately, as with other wide-gap semiconductors, ... |
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| Quantitative UV Absorbance Spectra of Chemical Agents and Simulants |
MAR 2008 |
41 pages |
| Authors:
J. M. Lochner; Aaron M. Hyre; STEVEN D. CHRISTESEN; Kristina R. Gonser; EDGEWOOD CHEMICAL BIOLOGICAL CENTER ABERDEEN PROVING GROUND MD RESEARCH AND TECHNOLOGY DIR
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| The quantitative UV absorption spectra of selected chemical agents and simulants have been measured for wavelengths in the near UV from 200 to 400 nm. Although these data are of interest in their own right, they are also necessary for predicting the sensitivity of UV Raman based detection systems. Of particular interest are the absorption values at 248.25 nm and 262 nm as these correspond to excitation wavelengths used by ... |
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| Quantitative UV Absorbance Spectra of Chemical Agents and Simulants |
MAR 2008 |
42 pages |
| Authors:
J. M. Lochner; Aaron M. Hyre; STEVEN D. CHRISTESEN; Kristina R. Gonser; EDGEWOOD CHEMICAL BIOLOGICAL CENTER ABERDEEN PROVING GROUND MD RESEARCH AND TECHNOLOGY DIR
|
| The quantitative UV absorption spectra of selected chemical agents and simulants have been measured for wavelengths in the near UV from 200 to 400 nm. Although these data are of interest in their own right, they are also necessary for predicting the sensitivity of UV Raman based detection systems. Of particular interest are the absorption values at 248.25 nm and 262 nm as these correspond to excitation wavelengths used by ... |
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| Modeling of SOC-700 Hyperspectral Imagery with the CAMEO-SIM Code |
26 OCT 2007 |
20 pages |
| Authors:
Roger Evans; TACOM RESEARCH DEVELOPMENT AND ENGINEERING CENTER WARREN MI
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| The CAMEO-SIM software program provides a physics-based spectral radiance simulation over the complete range from UV to Far-IR, the only real limitation being one of obtaining the necessary input data. This paper investigates a CAMEO-SIM simulation of the visual and near-IR spectral range measured by the portable Surface Optics SOC-700 hyperspectral sensor. The FOV and spatial resolution of the sensor will also be modeled appropriately. A description of the SOC-700 ... |
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| A Far-Ultraviolet Study of the Nova-Like V794 Aquilae |
20 FEB 2007 |
13 pages |
| Authors:
Patrick Godon; Edward M. Sion; Paul Barrett; Paula Szkody; VILLANOVA UNIV PA DEPT OF ASTRONOMY AND ASTROPHYSICS
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| V794 Aql was observed in a high state with the Hubble Space Telescope Space Telescope Imaging Spectrograph (HST STIS) on 2003 August 28, and with the Far Ultraviolet Spectroscopic Explorer (FUSE) on 2004 May 13. We present here a spectral analysis of the FUSE and HST STIS spectra. For a 0.9 solar mass, the best fit is an accretion disk with a mass accretion rate M = 10(exp -8.5) to ... |
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| Ultraviolet Properties of Halo Coronal Mass Ejections: Doppler Shifts, Angles, Shocks, and Bulk Morphology |
20 NOV 2006 |
20 pages |
| Authors:
A. Ciaravella; J. C. Raymond; S. W. Kahler; AIR FORCE RESEARCH LAB HANSCOM AFB MA SPACE VEHICLES DIRECTORATE
|
| We present UV spectral information for 22 halo or partial halo CMEs observed by UVCs. The CME fronts show broad line profiles, while the line intensities are comparable to the background corona. The Doppler shifts of the front material are generally small, showing that the motion of gas in the fronts is mostly transverse to the line of sight. This indicates that, at least in halo CMEs, the fronts generally ... |
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| Nanoscale Polymeric Photocells by Advanced Electrospinning |
20 JUL 2006 |
51 pages |
| Authors:
Anvar Zakhidov; John Ferraris; Kenneth Balkus; TEXAS UNIV AT DALLAS RICHARDSON
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| We presented detailed study of postproduction neat treatment of organic solar cells based on RR-P3HT:PCBM composite in a wide temperature range. The efficiency of such device was significantly Improved by postproduction heat treatment. Optimized parameters yielded >3% efficiency for devices on glass substrates and of |
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| Far-Field Spectral Analysis of a Space Shuttle Vernier Reaction Control System Firing |
22 FEB 2006 |
9 pages |
| Authors:
L. S. Bernstein; M. Braunstein; A. L. Broadfoot; W. L. Dimpfl; R. A. Dressler; Y. Chiu; J. A. Gardner; E. Murad; AIR FORCE RESEARCH LAB HANSCOM AFB MA SPACE VEHICLES DIRECTORATE
|
| Near-UV OH(A-X) and NH(A-X) emission bands at ~3100 and 3360 Angstrom, respectively, have been observed in the far-field radiance from the shuttle vernier reaction control system engine exhaust using the GLO imager spectrograph located in the payload bay during the STS-74 mission. Spectra were collected at a resolution of 4 Angstrom for daytime solar illumination conditions during low-Earth-orbit maneuvers. A temporal analysis (2 s temporal resolution) of spectral features is ... |
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| Growth, Characterization, and Application of InGaN with the Full-range Indium Content |
31 JAN 2006 |
33 pages |
| Authors:
Chih-Chung Yang; NATIONAL TAIWAN UNIV TAIPEI (TAIWAN) GRADUATE INST OF ELECTRO-OPTICAL ENGINEERING
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| InGaN was grown, covering the entire indium composition range, to characterize the various compositions of the material and to implement white-light generation. |
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| Fully Integrated, Multiport, Planar-Waveguide, Spectral Comparators and Multiplexers Based on Lithographic Holography |
31 AUG 2005 |
17 pages |
| Authors:
Thomas Mossberg; Christoph Greiner; LIGHTSMYTH TECHNOLOGIES INC EUGENE OR
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| Several multiplexer layouts based on holographic Brag reflectors were designed and fabricated in a preliminary device water Fabrication results constitute. for the first time the successful application of HBRs to wavelength division multiplexing. Measured device performance indicates that the photolithographic fabrication process has reduced multiplexer designs to practice essentially perfectly. Device apodization and engineering of multiplexer spectral transfer functions based on partial writing and offsetting of diffractive contours is shown ... |
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| Chemistry in Action: Space Shuttle Fuel Chemistry |
AUG 2005 |
32 pages |
| Authors:
Ghanshyam L. Vaghjiani; AIR FORCE RESEARCH LAB EDWARDS AFB CA SPACE AND MISSILE PROPULSION DIV
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| CVC Silicon Carbide Optical Properties and Systems (Preprint) |
29 JUL 2005 |
11 pages |
| Authors:
Jr Foss Colby A.; TREX ENTERPRISES CORP LIHUE HI
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| The chemical vapor composites (CVC) process provides for the rapid manufacture of near net shape, reduced residual stress silicon carbide (SIC) suitable for high performance optics. The reduction or elimination of residual stress provides several key advantages: 1) increased growth rate, 2) high yields and 3) near net shape deposition of complex geometries. Near net shape deposition allows for fabrication of spherical and aspherical optics without machining of the optical ... |
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| Explosive Residue Detection by Laser Surface Photo-Fragmentation- Fragment Detection Spectroscopy. 2. In Situ and Real-Time Monitoring of RDX. HMX, CL20, and TNT, by an Improved Ion Probe |
APR 2005 |
28 pages |
| Authors:
Jerry B. Cabalo; Rosario C. Sausa; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
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| We measured trace concentrations of hexahydro-1,3,5-hexanitro-1,3,5- triazine RDX, octohydro-1,3,5,7-octonitro-1,3,5,7-octazocine HMX, hexanitrohexazaisowurtzitane CL20, and 2,4,6-trinitrotoluene TNT by surface laser photo-fragmentation- fragment detection (SPF-FD) spectroscopy at ambient temperature and pressure. In this technique, a low power, 248-nm laser photo- fragments the target molecule on the surface of a substrate, and a low power, 226-nm laser ionizes the resulting nitricoxide (NO) fragment by resonance- enhanced multi-photon ionization by means of its A-X (0,0) ... |
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| Absolutely Calibrated Vacuum Ultraviolet Spectra in the 150 nm to 250 nm Range from Plasmas Generated by the NIKE KrF Laser |
25 MAR 2005 |
31 pages |
| Authors:
J. F. Seely; Uri Feldman; G. E. Holland; J. L. Weaver; A. N. Mostovych; S. P. Obenschain; A. J. Schmitt; R. Lehmberg; Benjawan Kjornarattanawanich; C. A. Back; NAVAL RESEARCH LAB WASHINGTON DC SPACE SCIENCE DIV
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| High resolution vacuum ultraviolet (VUV) spectra were recorded from plasmas generated by the NIKE KrF laser for the purpose of observing emission from the two-plasmon decay instability (TPDI) at 2/3 the NIKE wavelength (165 nm). The targets were irradiated by up to 43 overlapping beams with intensity up to ≈1014 W/sq cm and with beam smoothing by induced spatial incoherence (ISI). The targets consisted of planar foils of CH, BN, ... |
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| Pathogen Inactivated Plasma Concentrated: Preparation and Uses |
01 SEP 2004 |
19 pages |
| Authors:
Howard E. Purdum; CRYOFACETS INC RALEIGH NC
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| Plasma transfusion is a crucial element of casualty care. Unfortunately, two plasma components sharply limit its use: contaminants and excess water. Contamination arises because plasma must be obtained from human donors, and these donors may be infected with a wide variety of pathogens. If supply lines for military medical units are cut, such units may be forced to collect plasma from a local population suffering from high infection rates of ... |
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| Sub-100nm, Maskless Deep-UV Zone-Plate Array Lithography |
07 MAY 2004 |
154 pages |
| Authors:
Harry I. Smith; MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS
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| Semiconductor lithography is at a crossroads. With mask set costs in excess of $1M, long mask-turn-around times, and tools that are characterized by their inflexibility and skyrocketing costs (in excess of $20M), there is need for a new paradigm in lithography. Zone-Plate-Array Lithography (ZPAL) bypasses some of the most pressing problems of current lithography equipment by offering a maskless lithography tool that is scalable, flexible and low cost. It is ... |
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| Zinc Oxide Based Photonics Devices |
09 DEC 2003 |
25 pages |
| Authors:
Yungryel Ryu; Henry W. White; MOXTRONICS INC COLUMBIA MO
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| The objectives of this project are to develop critical technologies required for ZnO-based photonic device; high-quality ZnO film growth, p/n-doping processes, etching processes, and fabrication of ZnO light emitting devices. We have developed such critical technologies% in this Phase I work. Prototype ZnO light emitting devices have been successfully fabricated and tested for a feasibility study to assess whether ZnO devices can satisfy the operational requirements as photonics devices to ... |
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| Deep Ultra-Violet (DUV) Light Emitting Diodes |
30 AUG 2003 |
14 pages |
| Authors:
Deepika Singh; Steve Pearton; SINMAT INC GAINESVILLE FL
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| Problems to Overcome: The main problem to overcome is to develop a commercially and economically viable method to synthesize and process high crystalline quality diamond films for applications such as DUV LEDs and solar- blind detectors. Scientific Approach: The scientific approach is the homoepitaxial deposition on diamond films on large area (50 - 100 sq mm) synthetic Type Ib diamond substrates. Although type Ib diamond substrates have a high nitrogen ... |
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| Validation of Ionospheric Models |
31 MAR 2003 |
68 pages |
| Authors:
Patricia Doherty; BOSTON COLL CHESTNUT HILL MA INST FOR SCIENTIFIC RESEARCH
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| During the period of April 2002 through March 2003, we have continued to pursue the validation of ionospheric models. This work included significant efforts to access, process and analyze Total Electron Content (TEC) data from a variety of sources. These databases were useful in a series of validation studies that focused on PRISM's ability to predict the sub-peak ionospheric profile and geomagnetic storm effects. They were also useful in determining ... |
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| Ultraviolet-spectrum Light-emitting Diodes with Omnidirectional Reflectors for High Extraction Efficiency |
10 FEB 2003 |
4 pages |
| Authors:
E. F. Schubert; BOSTON UNIV MA
|
| This report covers the period August 1st to August 31st 2002 while I was working for Boston University (BU). On September 1st I transferred to Rensselaer Polytechnic Institute (RPI). It is my understanding that this report is required for the transfer of the contract from BU to RPI. The reflective properties of a triple-layer omni-directional reflector have been investigated. The reflector has a two-fold purpose namely it serves as ohmic ... |
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| Characterization of Metal-Oxide Nanoparticles: Synthesis and Dispersion in Polymeric Coatings |
2003 |
7 pages |
| Authors:
Li-Piin Sung; Stephanie Scierka; Mana Baghai-Anaraki; Derek L. Ho; NATIONAL INST OF STANDARDS AND TECHNOLOGY GAITHERSBURG MD
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| Metal-oxide nanoparticles can be used to optimize UV absorption and to enhance the stiffness, toughness, and probably the service life of polymeric materials, Characterization of the nano- and microstructure dispersion of particles is necessary to optimize the structure-property relationships. Characterizations of both TiO2 particles dispersed in an acrylic-urethane matrix and TiO2 nanostructured films obtained through sol-gel synthesis are discussed. Experimental methods include microscopy (confocal, AFM) and small angle neutron scattering ... |
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| An Approach to Nanoglasses through Anodic Oxidation of Sputtered Aluminum on Glass Surface |
2003 |
7 pages |
| Authors:
Satoru Inoue; Song-Zhu Chu; Kenji Wada; NATIONAL INST FOR MATERIALS SCIENCE IBARAKI TSUKUBA (JAPAN)
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| The new processes for the preparation of nanoglasses have been developed through anodic oxidation. The aluminum thin film sputtered on the ITO thin film on the glass surface was decomposed into alumina by anodic oxidation technique. The alumina layer possessed nanometer size pore array standing on the glass surface. The sizes of the pore was widened by acid etching from 10 approx. 20 nm to a few hundred nm. The ... |
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| Synthesis and Investigation of Non-Linear Optical Properties of Organometallic Polymers |
22 NOV 2002 |
26 pages |
| Authors:
William Douglas; MONTPELLIER-2 UNIV (FRANCE) LABORATORIE CHIMIE MOLECULAIRE ET ORGANISATION DU SOLIDE
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| This report results from a contract tasking Universite de Montpellier II as follows: The contractor will investigate the nonlinear optical properties of a variety of organometallic polymer-based materials. Organic materials offer the potential for greatly increased non-linear interactions with intense laser light, enabling the construction of a wide variety of electro-optic components for laser systems. |
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| Kinetics of CH Radicals With O2: Evidence for CO-Chemiluminescence in the Gas Phase Reaction |
18 JUN 2002 |
33 pages |
| Authors:
Ghanshyam Vaghjiani; ENGINEERING RESEARCH AND CONSULTING INCEDWARDS AFB CA
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| Production of CO vis-uv-chemiluminescence has been observed for the first time in the gas phase reaction of photolytic-methylidyne radicals with molecular oxygen. A trace amount of CMBr3 vapor was photo-decomposed in a pulsed-photolysis reactor using a 248-nm laser under multi-photon-dissociation conditions to produce the CH(X(sup 2)H) radicals in an excess of O2 in diluent helium carrier gas at 2.0 torr and 298 K. The time resolved chemiluminescent traces due to ... |
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| Development of High-Sensitivity Nitride Solar-Blind Detectors and Detector Arrays Using Low-Dislocation-Density Nitride Surfaces |
MAR 2002 |
62 pages |
| Authors:
J. F. Schetzina; NORTH CAROLINA STATE UNIV AT RALEIGH
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| This work explored the application of III-V nitride semiconductors for optical detectors in the ultraviolet (UV) region of the electromagnetic spectrum. Metalorganic vapor phase epitaxy was used to synthesize thin film p-i- n photodiode structures on double side polished sapphire substrates. These structures were fabricated into photodiode devices using generally accepted techniques for dry etching and p and n-contact metallizations. Test devices were characterized which demonstrated quantum efficiencies as high ... |
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| Specification of UV, Visible, and Infrared Emission Spectra of Sprites and Blue Jets |
18 JAN 2002 |
6 pages |
| Authors:
Timothy F. Bell; STANFORD UNIV CA SPACE TELECOMMUNICATIONS AND RADIOSCIENCE LAB
|
| During the period of performance Stanford University constructed a VLF/ELF receiver to measure the VLF/ELF electromagnetic and quasi-electrostatic fields produced by lightning during Sprite and Blue Jet events, and deployed this instrument in the field to make such measurements. The data acquired in the field was used to characterized the electromagnetic and quasi-electrostatic fields produced by lightning during Sprite and Blue Jet events. |
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| Rare Earth Nanophosphors |
13 DEC 2001 |
18 pages |
| Authors:
Stephen C. Rand; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| This project initiated a systematic investigation of doped nanodielectrics as optical materials in which strong scattering conditions offer prospects of new, low-voltage phosphors and high brightness surface lighting in the ultraviolet and visible spectral regions. The research effort succeeded in demonstrating not only new phosphors, but electrically-pumped stimulated emission in random powders and advances in the synthesis of dielectric nanophosphors suitable for bright source applications of many kinds, including flat ... |
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| Salt-Induced Block Copolymer Micelles as Nanoreactors for the Formation of CdS Nanoparticles |
NOV 2001 |
6 pages |
| Authors:
Hanying Zhao; Elliot P. Douglas; FLORIDA UNIV GAINESVILLE DEPT OF MATERIALS SCIENCE AND ENGINEERING
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| A novel preparation method of CdS nanoparticles in the core or corona of micelles is presented. Poly(styrene-block-2-vinylpyridine) (PS-b-P2VP) and cadmium ions form aggregates of single micelles, called compound micelles, upon addition of the cadmium acetate salt into a solution of the block copolymer in tetrahydrofuran. The growth of CdS nanoparticles is confined to the core of single micelles after introduction of hydrogen sulfide gas into the solution. UV-visible spectroscopy, fluorescence ... |
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| Aluminum Doped Parahydrogen Solids |
12 SEP 2001 |
3 pages |
| Authors:
Mario E. Fajardo; Michelle E. DeRose; Simon Tam; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE WEST
|
| During the past year we focused our efforts towards the production and characterization of gram-scale cryogenic parahydrogen (pH2) solids doped with large (- 1 %) concentrations of Al atoms. We incorporated into our apparatus a commercially available effusive Al atom source capable of delivering Al atom fluxes in excess of 10(exp 17) #/sq cm-s to the sample deposition substrate, enabling the deposition of heavily-doped millimeters-thick samples on an ^1 hour ... |
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| Identification of Chemical Agents (Mimics) Residues after Destructive Adsorption Using TPD and UV-vis-IR and Raman |
APR 2001 |
3 pages |
| Authors:
Kenneth J. Klabunde; KANSAS STATE UNIV MANHATTAN
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| Instrumentation was purchased that helps characterize the chemical structures and chemical reactions that occur when nanocrystalline metal oxides carry out destructive adsorption of chemical agents mimics. The residues (adducts) are characterized and the gases given off identified. |
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| Investigation of High-Energetic Transitions in Some Pr3+-Doped Fluoride and Oxide Crystals |
2001 |
6 pages |
| Authors:
I. Sokolska; S. Kueck; M. Baluka; HAMBURG UNIV (GERMANY) INST FUER LASER-PHYSIK
|
| The excitation and emission spectra obtained for Pr(3+):YAlO3, Pr(3+):LiYF4 and K5PrLi2F10 crystals by means of high-energetic excitation with synchrotron radiation (HASYLAB, DESY Hamburg, Germany) are presented. In the emission spectra broad, overlapping bands in UV range are present Their positions, bandwidths as well as the short emission decay times suggest, that emission from levels of 4f5d configuration dominate in all of the crystals investigated. |
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| Temperature, Absorption and Excitation Study of the A(1-x)B(x)C Crystals by Raman Scattering Methods |
2001 |
4 pages |
| Authors:
M. Kozielski; M. Szybowicz; POZNAN UNIV OF TECHNOLOGY (POLAND) FACULTY OF TECHNICAL PHYSICS
|
| Recently, wide gap II-VI mixed crystals are studied for their application in technology of blue-green laser diodes. The mixed crystals were grown using the modified pressure Bridgman method. The temperature, absorption and excitation study of Zn(1-x)A(x)Se mixed crystals using Raman scattering method is reported. Measurements have been performed for crystals with x = 0.07 for A = Mg content and x = 0.09 for A = Be content. The Raman ... |
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| Excited State Absorption of the Cr(6+)O(2-) Center in Li2B4O7 Glass |
2001 |
4 pages |
| Authors:
Czeslaw Koepke; Krzysztof Wisniewski; Marek Grinberg; NICHOLAS COPERNICUS UNIV OF TORUN (POLAND) INST OF PHYSICS
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| We present excited state absorption (ESA) measurements of the Cr:Li2B4O7 glass (Cr:LBO-glass) along with preliminary interpretation. The most distinct feature in the ESA characteristics is connected with the presence of chromium in its hexe-(d(sup 0)) valence states. The Cr(6+) ions appear to contribute in the deexcitation processes and their evidence can be seen in the ESA spectra under excitation wavelength at 308 nm. We interpret the ESA spectra detected with ... |
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| Practical Issues in Applying Ultra-Broadband (UB) Radiation to the Monitoring of Hazardous Air Pollutants (HAPs) at Extended Distances |
27 NOV 2000 |
13 pages |
| Authors:
A. Ting; J. Qiu; C. Manka; NAVAL RESEARCH LAB WASHINGTON DC
|
| The ultra-broadband (UB) radiation source that is being developed at the Naval Research Laboratory (NRL) has the potential to become a versatile source of radiation for active remote sensing of chemical hazardous air pollutants (HAPs) at extended distances. However, before the realization of this important application of the radiation source, some of the practical issues involved in the research and development of the technique of UB generation and HAP detection ... |
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| Spatial-Spectral Sensor Techniques for Detection of Atmospheric Turbulence |
03 MAR 2000 |
71 pages |
| Authors:
Robert D. Sears; Lyle Broadfoot; VANGUARD RESEARCH INC FAIRFAX VA
|
| This report addresses the problem of utilizing spatial-hyperspectral imaging capabilities of spaceborne sensors to detect and characterize regions of atmospheric turbulence and cirrus cloud clutter which may impact employment and/ or performance of space based laser and airborne high energy laser weapons systems. Our concept for worldwide detection, characterization and mapping of atmospheric turbulence and cirrus clouds involves use of satellite-borne (and possibly airborne) spectral and ... |
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| Ultraviolet Measurement of Optical Memory Subsystems |
FEB 2000 |
29 pages |
| Authors:
Joseph Osman; Rebecca Bussjager; David Grucza; AIR FORCE RESEARCH LAB ROME NY SENSORSDIRECTORATE
|
| This effort mapped out the wavelengths of the states within the bandgap which have enough absorption strength to be used to write the material. Since metal oxides are always highly defected materials, we predict that subbandgap light could also be used to drive other processes, such as catalysis, which were previously only thought to be possible with superbaridgap light. We found that using 385 am light ... |
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| Photochemistry of Fe2(CO)8(Mu-CH2) |
04 JAN 2000 |
70 pages |
| Authors:
Daniel M. Branan; OHIO STATE UNIV COLUMBUS DEPT OF CHEMISTRY
|
| We herein present the previously unreported photochemistry of two forms of the dimetallocyclopropane the complex Fe2(CO)8(mu-CH2), and its deuterated analog. We have determined that it behaves similarly to other dimetallic carbonyls in that it eliminates carbon monoxide upon irradiation with high-intensity UV/Visible light to form distinct single and double CO-loss products. Upon formation of a 34-electron single CO-loss product however, it exhibits the ability to ... |
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| Operational and Calibration of the NPS Ultraviolet Imaging Spectrometer (NUVIS) in the Detection of Sulfur Dioxide Plumes |
DEC 1999 |
104 pages |
| Authors:
Stephen A. Marino; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The Naval Postgraduate School's Ultraviolet Imaging Spectrometer (NUVIS) is a hyperspectral sensor with a spectral response of 300 to 375 nanometers. This thesis research concentrates on the operation and calibration of NUVIS in the detection of effluent suliur dioxide (SO2) plumes. NUVIS is capable of detecting and quantifying SO2 emissions in the form of effluent smokestack plumes by exploiting SO2's unique Uv absorption signature. Laboratory ... |
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| Concept of Gamma-Ray Lasing Assisted by Nuclear Recoil Effect |
OCT 1999 |
|
| Authors:
Lev a. Rivlin; MIREA TECHNICAL UNIV MOSCOW (RUSSIA)
|
 | This report results from a contract tasking MIREA Technical University as follows: The contractor will develop an analytical and quantitatively proven treatment of how to incorporate the nuclear recoil phenomenon into the nuclear gamma-ray lasing process, including the basic scheme of a first demonstration experiment. |
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| Spatially Resolved Combustion Species and Temperatures of Solid Propellant Flames Using Snapshot Spectroscopy |
OCT 1999 |
32 pages |
| Authors:
Barrie E. Homan; John A. Vanderhoff; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Experimental improvements have been made in the ultraviolet (UV)- visible absorption spectroscopy technique applied to propellant flame diagnostics. The two-dimensional (2-D) feature of an intensified charge-coupled device (ICCD) detector was used to simultaneously record multiple, spatially distinct absorption spectra over a region of 0.35 cm. Temporal resolution has been increased to 1 ms by pulsing a simmering xenon arc lamp. The resulting increase ... |
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| New Tetraazacrown Ethers Containing Two Pyridine, Quinoline, 8- Hydroxyquinoline, or 8-Aminoquinoline Sidearms |
12 AUG 1999 |
11 pages |
| Authors:
Zhaoxia Yang; Jerald S. Bradshaw; Xian X. Zhang; Paul B. Savage; Krzysztof E. Krakowiak; BRIGHAM YOUNG UNIV PROVO UT DEPT OF CHEMISTRY AND BIOCHEMISTRY
|
| A series of macrocyclic tetraazacrown ethers containing two pyridine, quinoline, 8-hydroxyquinoline, or 8-aminoquinoline sidearms has been prepared. Crab-like cyclization of bis(alpha-chloroacetamide)s and diamines followed by reduction of the cyclic diamides was used to synthesize the selected crown ethers containing two unsubstituted macroring nitrogen atoms. The preparation of the macrocycles with sidearms was accomplished by reductive aminatlon of the proper aldehydes with the crown ethers using sodium triacetoxyborohydride (NaBH(OAc)3) as the ... |
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| ISTEF Passive Imaging Programs |
22 JUL 1999 |
25 pages |
| Authors:
Alan Tietjen; Jodean Wendt; Jonathan Emery; Don Dawson; Rolf Ahlgreen; NICHOLS RESEARCH CORP ORLANDO FL
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| Unique Approaches to BMDO/ISTEF Optical Systems Design |
1999 |
12 pages |
| Authors:
Joseph B. Houston Jr; NICHOLS RESEARCH CORP SHALIMAR FL
|
| Recently, two 12.5-inch diameter aperture Small Transportable ISTEF Pedestal System (STRIPS) telescopes were designed using all-reflective optics in order to provide four optical bands ranging from 0.3-microns to 15.0-microns on a single instrument mount. Each telescope provides three focal panes/focal lengths for a maximum 1-inch diameter circular image plane. As the name implies, these telescopes are easily transportable (by air, land and sea), and capable of being ... |
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| Multi-Spectral Shocklayer Radiance from a Hypersonic Slender |
1999 |
15 pages |
| Authors:
Deborah A. Levin; David M. Mann; Clifton B. Phillips; Mike Lovern; Carl Howlett; GEORGE WASHINGTON UNIV WASHINGTON DC
|
| The Science and Technology Directorate of the Ballistic Missile Defense Organization is conducting programs to characterize and measure the radiation emitted by the flows about hypersonic vehicles. In addition to understanding the basic physics of high temperature plasmas, ongoing analyses are establishing how such emissions are useful for the detection of theater missile targets using the mid-wave infra-red (MWIR) spectral region (3 - 5 ... |
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| Substituent Effects on the Optical Properties of Free Base (Alpha,Beta, Gamma,Delta)-Tetraphenylporphyrin |
28 OCT 1998 |
81 pages |
| Authors:
Kirsten M. Wohlwend; WRIGHT STATE UNIV DAYTON OH
|
| Optical limiting devices have gained importance as more laser threats have been developed. The purpose of this project was to study the optical properties of various substituted groups on TPP and use the information obtained to improve materials under investigation for potential use as optical limiting dyes. Compounds were obtained that had substituents added to the phenyl groups of free base tetraphenyl porphyrin. Absorption peak shifts, molar ... |
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| Final Technical Report for AFOSR Grant #F49620-97-1-0261 |
FEB 1998 |
7 pages |
| Authors:
J. G. Eden; ILLINOIS UNIV AT URBANA DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Research conducted under AFOSR grant no. F49620-97-l-026l focused on exploring the properties of microdischarge devices fabricated in silicon. Cylindrical devices having diameters between 20 micrometers and 400 micrometers have been fabricated and intense emission on the B --> X transition of xenon monoiodide (XeI) in the ultraviolet (UV) is produced when mixtures of Xe/I2 are introduced to the discharge. Having specific power loadings beyond 100 kW-/cu cm on a continuous ... |
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| Ultrashort Pulse Excitation of Dense Upconversion Media |
10 NOV 97 |
82 pages |
| Authors:
Stephen C. Rand; MICHIGAN UNIV ANN ARBOR DIV OF RESEARCH DEVELOPMENT AND ADMINISTRATION
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| This project was initiated to identify conditions in dense upconversion media under which ultrashort pulses could lead to new applications. Four main results were obtained. First, a new channel for the generation of ultraviolet upconversion emission in Erbium-doped compounds was discovered. Second, an extremely promising imaging technique which relies on time-gated, ultrafast upconversion was demonstrated. Third, induced nonlinear response in dense upconversion materials was shown to be primarily dispersive in ... |
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| Conformation of Polyaniline: Effect of Mechanical Shaking and Spin Casting |
20 SEP 97 |
4 pages |
| Authors:
J. Feng; A. G. MacDiarmid; A. J. Epstein; OHIO STATE UNIV COLUMBUS DEPT OF PHYSICS
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| We find from diffuse reflectance Vis/UV spectral studies of polyaniline (emeraldine base; EB) powder doped with camphorsulfonic acid (HCSA) that the free carrier tail characteristic of an extended coil conformation appears and increases gradually on mechanical shaking with KBr powder. We also find that the forces present during spin-casting of EB films have a significant effect on the value of the absorption maximum of the exciton peak. |
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| Synthesis of Oligomeric Anilines |
20 SEP 97 |
4 pages |
| Authors:
W. J. Zhang; J. Feng; A. G. MacDiarmid; A. J. Epstein; OHIO STATE UNIV COLUMBUS DEPT OF PHYSICS
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| Parent aniline oligomers such as tetramer and '16-mer' have been synthesized by a general method. This method can be used to synthesize other oligomers by selecting appropriate ratios of reactants and appropriate oxidants. The oligomers were characterized by UV/Vis, IR, NMR, mass spectroscopy, GPC and elemental analysis. The conductivities of Hcl doped oligomers were lower than that of polyaniline. ANNOTATION: Reprint: Synthesis of Oligomeric Anilines |
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| In-Situ Monitoring and Feedback Control of Metalorganic Precursor Delivery |
29 JUL 1997 |
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| Authors:
William J. DeSisto; Brian J. Rappoli; DEPARTMENT OF THE NAVY WASHINGTON DC
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| The in-situ monitoring of metal organic precursor delivery in a metal organic chemical vapor deposition oxide system in high temperature super conductors (HTSC) film growth is accomplished by utilizing the distinct absorbance bands for metal organic compounds. As an ultraviolet-visible light beam is passed through an effluent metal organic gas stream the relative change in ultraviolet-visible absorbance of the ultraviolet-visible light beam passing through the effluent metal organic gas stream ... |
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ULTRAVIOLET SPECTRA
