| The Role of Generation Volume and Photon Recycling in Transport Imaging of Bulk Materials |
Dec 2011 |
49 pages |
| Authors:
Yoseoph Seo; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
 | The goal of this research was to use Monte Carlo simulations to further develop the model that describes transport imaging by including a more realistic description of the generation region created by the incident electrons. Monte Carlo simulation can be used to determine the energy distribution in bulk materials due to the interaction with incident electrons. In the simulation, the incident electrons undergo both elastic and inelastic scattering events. Through ... |
|
| Positive Vibrational Entropy of Chemical Ordering in FeV |
08 Sep 2011 |
5 pages |
| Authors:
J A Munoz; M S Lucas; O Delaire; M L Winterrose; L Mauger; Chen W Li; A O Sheets; M B Stone; D L Abernathy; Yuming Xiao; CALIFORNIA INST OF TECHNOLOGY PASADENA W M KECK LAB
|
| Inelastic neutron scattering and nuclear resonant inelastic x-ray scattering were used to measure phonon spectra of FeVas a B2 ordered compound and as a bcc solid solution. The two data sets were combined to give an accurate phonon density of states, and the phonon partial densities of states for V and Fe atoms. Contrary to the behavior of ordering alloys studied to date, the phonons in the B2 ordered phase ... |
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| Chemical Reactivity as a Probe of Ionic-Liquid Surfaces |
30-Apr-2009 |
18 pages |
| Authors:
Kenneth McKendrick; Carla Waring; Paul A Bagot; Matthew L Costen; HERIOT-WATT UNIV EDINBURGH (UNITED KINGDOM)
|
| This report results from a contract tasking Heriot-Watt University as follows: The work will be similar to that which the group has pioneered in related studies of the reactions of O(3P) atoms with hydrocarbon liquids. It is based on laser-photolysis of a low pressure of a suitable O(3P) precursor (NO2 at 355 nm) above the surface of the liquid. This produces O(3P) atoms with a relatively broad, superthermal kinetic energy ... |
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| Simulation of HEAO 3 Background |
2007 |
6 pages |
| Authors:
B. L. Graham; B. F. Phlips; R. A. Kroeger; J. D. Kurfess; GEORGE MASON UNIV FAIRFAX VA
|
| A Monte Carlo technique for modeling background in space-based gamma-ray telescopes has been developed. The major background components included in this modeling technique are the diffuse cosmic gamma-ray flux, the Earth's atmospheric flux, the decay of nuclei produced by spallation of cosmic rays, trapped protons and their secondaries, the decay of nuclei produced by neutron capture, and the de-excitation of excited states produced by inelastic scattering of neutrons. The method ... |
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| Proton Dose Assessment to the Human Eye Using Monte Carlo N-Particle Transport Code (MCNPX) |
AUG 2006 |
82 pages |
| Authors:
David B. Oertli; TEXAS A AND M UNIV COLLEGE STATION
|
| The objective of this project was to develop a simple MCNPX model of the human eye to approximate dose delivered from proton therapy. The calculated dose included that due to proton interactions and secondary interactions, which included multiple coulombic energy scattering, elastic and inelastic scattering, and non-elastic nuclear reactions (i.e., the production of secondary particles). After benchmarking MCNPX with a known proton simulation, the proton therapy beam used at Laboratori ... |
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| Plume Characteristics of the Busek 600 W Hall Thruster |
12 JUL 2006 |
11 pages |
| Authors:
Jared M. Ekholm; Jr. Hargus William A.; C. W. Larson; Michael R. Nakles; Garrett Reed; Carrie S. Niemela; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| To better characterize the potential impacts of the operation of a Busek Company, Inc. BHT-HD-600 laboratory Hall thruster on spacecraft, a number of plume properties have been measured. These include current density using a Faraday probe, ion energy distribution using a retarding potential analyzer, and ion species fractions using an E x B probe. The BHT-HD-600 Hall thruster is a nominally 600 W xenon Hall thruster developed by Busek Co. ... |
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| Some Aspects of the Boltzmann Equation for a Granular Gas |
13 JUL 2005 |
9 pages |
| Authors:
James W. Dufty; FLORIDA UNIV GAINESVILLE DEPT OF PHYSICS
|
| The Boltzmann equation for a gas of smooth, inelastic hard spheres is introduced and its homogeneous solution for an isolated system is discussed. The possibility of hydrodynamic excitations is explored using the linearized Boltzmann equation for small spatial perturbations of the homogeneous state. It is shown that the spectrum of the generator for this linear dynamics contains five points at long wavelengths that are the origin of hydrodynamic excitations. With ... |
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| International Symposium on Gas Kinetics Bristol (18th) on August 7-12, 2004. Book of Abstracts |
29 JUL 2004 |
197 pages |
| Authors:
BRISTOL UNIV (UNITED KINGDOM)
|
| The Final Proceedings for 18th International Symposium on Gas Kinetics, 7 August 2004 - 12 August 2004 The biennial International Gas Kinetics Conference will bring together internationally recognized experts in experimental, theoretical and modelling studies of gas kinetics, combustion and plasma diagnostics, reaction dynamics and atmospheric chemistry. The meeting is being organized in conjunction with the Gas Kinetics Group of the Royal Society of Chemistry and will feature both invited ... |
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| State-to-State Thermal/Hyperthermal Collision Dynamics of Atmospheric Species |
09 JAN 2004 |
10 pages |
| Authors:
David J. Nesbitt; COLORADO UNIV AT BOULDER
|
| Direct absorption IR laser methods developed under AFOSR support have been used to study state-to-state reactive scattering dynamics under single collision conditions. Efforts over this past granting period have led to significant progress in several areas: i) H atom abstraction dynamics in prototypic atom + diatom (e.g. X + HD --> Hx(v,J) + atom + triatom (e.g. X + H2O --> Hx(v,J) + OH(v,N)) and atom + polyatom (e.g. X ... |
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| Proud Target Classification Based on Multiple Aspect Low Frequency Response |
OCT 2001 |
|
| Authors:
B Zerr; A. Tesei; A. Maguer; B. Houston; P. A. Sletner; SACLANT UNDERSEA RESEARCH CENTRE LA SPEZIA (ITALY)
|
 | The aspect dependence of the acoustic signature has been demonstrated to be an essential indicator to discriminate between man-made and natural underwater objects. A classification method has been defined using the variation with incidence angle of the acoustic waves scattered by an elastic object. As the experiment conducted in a basin on free-field cylinders produced encouraging results, more realistic acoustic measurements were conducted on natural and manufactured objects positioned on ... |
|
| 26TH International Symposium on Free Radicals. Assisi, Italy, 2-7 September 2001. Book of Abstracts |
07 SEP 2001 |
227 pages |
| Authors:
PERUGIA UNIV (ITALY) DIPT DI CHIMICA
|
| Sessions: (1) Reaction Dynamics: Experiment and Theory. Reactivity of the O(D1) atom: from state-to-state dynamics to multiple pathway chemistry; Quantum dynamics on some atom-hydrogen insertion reactions; UV and near-UV photodissociation dynamics of small hydrocarbon free radicals. (2) Spectroscopy. Some 'radical' new experiments in molecular spectroscopy; Linear triatomic radicals containing transitions metal atoms: a case history of vibronic coupling; Fourier-transform microwave spectroscopy of the acetyl radical. (3) Astrochemistry. Low temperature reactions ... |
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| Wide Bandwidth Far-Infrared Mixing Using a High-T(c) Superconducting Bolometer |
29 SEP 2000 |
3 pages |
| Authors:
Mark Lee; Richard C. Li; LUCENT TECHNOLOGIES INC MURRAY HILL NJ
|
| We report on the gain bandwidth and noise characteristics of far-infrared mixers using high-Tc superconducting YBa2Cu3O7 (YBCO) thin films. The YBCO films are patterned into lattice-cooled hot-electron bolometers (HEBs) coupled to an integrated antenna and transmission line. Heterodyne and homodyne down- conversion using LO frequencies of 115 GHz and 585 GHz show a device conversion gain of as high as -9.5 dB at 66 K using 1 micro W of ... |
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| High Strain-Rate and Quasi-Static Ductile Failure Mechanisms in Porous Materials |
14 AUG 1999 |
8 pages |
| Authors:
M. A. Zikry; NORTH CAROLINA STATE UNIV AT RALEIGH
|
| An inelastic rate-dependent crystalline constitutive formulation and specialized computational schemes have been developed and used to obtain a detailed understanding of the interrelated physical mechanisms that can result in ductile material failure in rate-dependent porous crystalline materials subjected to finite inelastic deformations. The effects of void growth and interaction and specimen necking on material failure have been investigated for a single material cell, with ... |
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| Positive Anisotropic Group Scattering Cross Sections for Radiation Transport |
MAY 1999 |
207 pages |
| Authors:
J. M. DelGrande; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| In solving the Boltzmann transport equation, most discrete ordinates codes calculate the source term by first approximating the scattering cross section using a Legendre polynomial expansion. Such expansions are insufficient when scattering is anisotropic and the Legendre expansion is truncated prematurely. This can lead to nonphysical negative cross sections, negative source terms and negative angular fluxes. While negative sources are problematic for standard discrete ordinates methods leading to poor convergence ... |
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| Inelastic Scattering Matrix Elements for the Collision B(2P1/2) + H2(j) --> B(2P3/2) + H2(j') |
MAR 1999 |
113 pages |
| Authors:
Thomas A. Niday; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| Initial efforts to characterize the scattering dynamics of B + H2 focus on computing scattering matrix elements for the fine structure transition B (2P1/2) --> B (2P3/2) in collisions with H2, allowing for rotational excitation. Using a new application of the time dependent Channel Packet Method (CPM), reactant and product wave packets are prepared in the asymptotic limit on the B (2P1/2) and B (2P3/2) surfaces. ... |
|
| Hydrolight 4.0 Users Guide |
NOV 1998 |
100 pages |
| Authors:
Curtis D. Mobley; SEQUOIA SCIENTIFIC INC MERCER ISLAND WA
|
| HYDROLIGHT 4.0 is a radiative transfer numerical model that computes spectral radiance distributions and related quantities for water bodies. Input to the model consists of user-supplied information about the absorbing and scattering properties of the water body, the sky radiance incident onto the water surface, the wind speed, and the bottom of the water column. The water absorbing and scattering properties can vary with depth and wavelength. The model includes ... |
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| Site-Specific Molecule-Surface Interactions on Metal Oxides |
OCT 1998 |
7 pages |
| Authors:
Hanna Reisler; Curt Wittig; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF CHEMISTRY
|
| Collision induced dissociation of highly excited NO2 was observed for the first time for well characterized MgO(100) surfaces with parent and product angular resolution at various internal and incident translational energies, and with product NO state-selected detection. A model was developed which explains the results, and enabled comparisons with the corresponding gas-phase experiments. Scattering of HCl(v=0) was examined at incident energies 0.11-0.90 eV, and demonstrated the transition between direct-inelastic scattering ... |
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| High Resolution Studies of Thin Film Interfaces |
02 MAR 98 |
11 pages |
| Authors:
R. A. Buhrman; CORNELL UNIV ITHACA NY
|
| This research program was generally concerned with the application of Ballistic Electron Emission Microscopy (BEEM) and related scanning tunneling microscopy (STM) techniques to the study of interfacial ballistic transport in a range of electronic materials, and with the extension of BEEM to locally examine aspects, consequences, and possible applications of elastic and inelastic electronic scattering processes at both Schottky barrier interfaces and thin film overlayers. |
|
| Experiments and Theory in Ultracold Collision Dynamics |
OCT 97 |
4 pages |
| Authors:
John Weiner; MARYLAND UNIV COLLEGE PARK
|
| This research program seeks to understand and control atomic collisions at ultracold temperatures where quantum and light-filed effects lead to new interactions between atoms. We have pursued experimental and theoretical investigations of optical shielding and suppression, and the nature of ground- state collisions in and near a Bose-Einstein condensate. This research shows how inelastic collisions can be turned on and turned off by light fields, how the scattering length of ... |
|
| First International Induced Gamma Emission Workshop |
SEP 97 |
|
| Authors:
INSTITUTE OF ATOMIC PHYSICS BUCHAREST (ROMANIA)
|
| The Final Proceedings for International Workshop on Induced Gamma Emission IGE'97, 16 August 1997 - 20 August 1997. The Topics covered include: induced gamma emission, gamma ray laser, ultra-high energy density materials, and ultrashort wavelength lasers. |
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| Quantitative Light-Scattering Angular Correlations of Conglomerate Particles |
AUG 1997 |
24 pages |
| Authors:
Paul Pellegrino; Gorden Videen; Ronald G. Pinnick; ARMY RESEARCH LAB ADELPHI MD
|
| Quantitative analyses were performed of the fluctuations in the light scattering intensities associated with micrometer size glycerol droplets containing spherical latex inclusions. Scattering intensities at two angles (the near forward and near backward directions) were measured as a function of time. We analyzed these signals using two techniques. We find that calculated autocorrelation time constants associated with these signals are not consistent with current models that are based on interference ... |
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| Bioluminescence Estimation Algorithms for In Situ Irradiances |
DEC 96 |
12 pages |
| Authors:
N. J. McCormick; UNIV OF WASHINGTON SEATTLE DEPT OF MECHANICAL ENGINEERING
|
| This optical oceanography project provided support to researchers doing ocean optics experiments by developing analytical methods for solving multiple-scattering inverse and forward problems of radiative transfer, including: (1) Solutions of inverse problems that can be used to determine the spatial dependence of internal sources and/or inherent optical properties (IOPs) . The sources of interest can arise from inelastic scattering effects, bioluminescence, or fluorescence, while the IOPs of interest are the ... |
|
| Estimating Bounds on Collisional Relaxation Rates of Spin-Polarized 87Rb Atoms at Ultracold Temperatures |
Jul 1996 |
16 pages |
| Authors:
Frederick H Mies; Carl J Williams; Paul S Julienne; Morris Krauss; NATIONAL INST OF STANDARDS AND TECHNOLOGY GAITHERSBURG MD
|
| We present quantum scattering calculations for the collisional relaxation rate coefficient of spin-polarized (87)Rb(function = 2, minutes of time = 2) atoms, which determines the loss rate of cold Rb atoms from a magnetic trap. Unlike the lighter alkali atoms, spin-polarized (87)Rb atoms can undergo dipolar relaxation due to both the normal spin-spin dipole interaction and a second-order spin-orbit interaction with distant electronic states of the dimer. We present ab ... |
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| A Simple, Causal Method to Incorporate Anelastic Attenuation into Finite-Difference Calculations |
21 DEC 95 |
58 pages |
| Authors:
Rong-Song Jih; PHILLIPS LAB HANSCOM AFB MA
|
| Current nuclear treaty monitoring interest has shifted to the verification of a comprehensive test ban treaty (CTBT), including the detection of the first test of potential proliferators. Predictive modeling capabilities are crucial, not just desirable, in the context of CTBT and proliferation monitoring. Synthetic seismograms generated with the linear-finite-difference (LFD) code are particularly useful for regions where earthquake or explosion data are not available. However, to date many LFD modeling ... |
|
| Collisional and Dissociative Processes Involving Molecular Free Radicals |
13 APR 95 |
23 pages |
| Authors:
Paul J. Dagdigian; Millard H. Alexander; JOHNS HOPKINS UNIV BALTIMORE MD
|
| A collaborative experimental and theoretical study of a number of elementary collisional processes involving small molecular free radicals of importance in combustion and in the decomposition of propellants has been carried out. These have involved chemical reactions and photodissociation, as well as nonreactive collision-induced rotational and electronic transitions. Information on non-bonding interactions involving free radicals was also obtained from analysis of the electronic spectrum of van der Waals complexes of ... |
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| Collisional and Dissociative Processes Involving Molecular Free Radicals |
13 APR 95 |
22 pages |
| Authors:
Paul J. Dagdigian; Millard H. Alexander; JOHNS HOPKINS UNIV BALTIMORE MD
|
| In this project, we have carried out a collaborative experimental and theoretical study of a number of elementary collisional processes involving small molecular free radicals of importance in combustion and in the decomposition of propellants. These have involved chemical reactions and photodissociation, as well as nonreactive collision-induced rotational and electronic transitions. In addition, we have obtained information on the non- bonding interactions between a free radical and a rare gas ... |
|
| AB Initio Studies of Electron and Positron Scattering from Non-Linear Molecules |
MAR 95 |
6 pages |
| Authors:
Charles A. Weatherford; FLORIDA AGRICULTURAL AND MECHANICAL UNIV TALLAHASSEE
|
| During a period of three years, several important developments and calculations were made on the electron-molecule scattering. We presented rotationally elastic, inelastic and summed cross sections for electron scattering with several polyatomic molecules (CH4, SiH4, GeH4, H2O, H2S and NH3) in a highly sophisticated close-coupling non-empirical theory. Exchange effects were included exactly, while polarization corrections were considered approximately but without involving any fitting parameter. Results were compared with measurements where ... |
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| State Resolved Differential Cross Sections for Reactions Important to the Decomposition of Energetic Materials |
01 SEP 94 |
10 pages |
| Authors:
Paul L. Houston; CORNELL UNIV ITHACA NY DEPT OF CHEMISTRY
|
| This final report describes the research whose goal was to develop a new technique for characterizing the velocity distributions of state-selected reaction products and to use this technique to study reactions of importance to the decomposition of energetic materials. In this technique, the three- dimensional product velocity distribution is determined by ionizing the appropriate species, waiting for a delay while the species separate along their trajectories, and then projecting the ... |
|
| Microforces in Electromigration |
DEC 93 |
54 pages |
| Authors:
Richard S. Sorbello; WISCONSIN UNIV-MILWAUKEE DEPT OF PHYSICS
|
| Theoretical description of electromigration (EM) in metallic microstructures. How EM in a small metallic system is affected by surfaces, interfaces, and extended defects e.g. grain boundaries and dislocations. Electronic aspects of EM and dynamical atom response to current; emphasizing mesoscopic systems. Calculated local transport field in very small structures: near grain boundary or dislocation; and probeability by scanning tunneling microscope. Investigated inelastic scattering effects on electrical conductivity and EM of ... |
|
| Triple Axis and Spins Spectrometers |
SEP 93 |
17 pages |
| Authors:
S. F. Trevino; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY ARSENAL N J ARMAMENT ENGINEERING DIRECTORATE
|
| The triple axis and spin polarized inelastic neutron scattering (SPINS) spectrometers which are installed at the National Institute of Standards and Technology Cold Neutron Research Facility (CNRF) are described in this report. The general principle of operation of these two instruments is described in sufficient detail to allow the reader to make an informed decision as to their usefulness for his needs. However, it is the intention of the staff ... |
|
| Twenty-Second International Symposium on Free Radicals. Book of Abstracts. Doorwerth, The Netherlands, 6-10 September 1993 |
SEP 93 |
117 pages |
| Authors:
ARMY FOREIGN SCIENCE AND TECHNOLOGY CENTER CHARLOTTESVILLE VA
|
| Partial contents: Photofragment spectroscopy of free radicals; Photodissociaton dynamics of free radicals; Rotation vibration state specific studies of the unimolecular dynamics of highly vibrationally excited molecules; High resolution spectroscopy of fragments from photodissociation; Free radicals in interstellar space; Microwave spectra and structure of HC3O; Rotational energy transfer of OH in collisions with He, Ar and H2; Rotationally and electronically inelastic scattering of diatomic free radicals; Bridged structures in small molecules ... |
|
| Solid-State Dynamics in Novel Semiconductor Nanostructures |
30 JUN 93 |
8 pages |
| Authors:
Michael A. Stroscio; NORTH CAROLINA STATE UNIV AT RALEIGH
|
|
| Dynamics of Gas-Surface Interactions |
26 JAN 93 |
47 pages |
| Authors:
Steven J. Sibener; CHICAGO UNIV IL JAMES FRANCK INST
|
| This research initiative deals with the interaction of neutral particle, electron, and optical beams with well-characterized single crystal surfaces. These studies are motivated by a desire to understand and control surface reactions, such as surface oxidation, the technological need to characterize the physical properties of thin films and surfaces, and the desire to understand how energy and momentum are exchanged at the surface of a material when it is subjected ... |
|
| Cross Phase Modulation Induced Nonelastic Collisions of Optical Solitons, |
22 MAY 1992 |
|
| Authors:
A. Hook; M. Lisak; D. Anderson; V. N. Serkin; CHALMERS UNIV OF TECHNOLOGY GOETEBORG (SWEDEN)
|
| A new class of problems has recently appeared; nonelastic interaction of solitons at different polarization states or different wavelengths. Recently it was predicted that the so-called effects of shadows should appear in the process of collisions between solitons in birefringent fibres. The same behaviour is observed in computer simulations of NLSE solitons at different wavelengths in single-mode fibres. |
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| The Temperature Dependence of the Resonant Tunneling Process, |
22 MAY 1992 |
|
| Authors:
I. Bar-Joseph; Y. Gedalyahu; A. Yacoby; T. K. Woodward; D. S. Chemla; WEIZMANN INST OF SCIENCE REHOVOT (ISRAEL)
|
| The nature of a resonant tunneling process that involves inelastic scattering events is of a wide interest lately. In this paper, we investigate the influence of inelastic scattering by measuring the tunneling characteristics at various temperatures. We show that the stored charge and the transit time are not sensitive to a large temperature change. We used a symmetric double barrier diode under electric bias to study the electrons tunneling process. ... |
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| Semiconductor Ballistic Electron Reflection, Refraction, Interference, and Diffraction Effects: Modeling and Quantum Device Applications, |
APR 1992 |
|
| Authors:
T. K. Gaylord; G. N. Henderson; E. N. Glytsis; D. W. Wilson; P. N. First; GEORGIA INST OF TECH ATLANTA
|
| Semiconductor growth techniques such as molecular beam epitaxy have been refined so that nanostructures can be grown with precise monolayer and compositional control . This has produced semiconductor materials in which ballistic (collisionless) electron transport lengths of over a micron have been observed. That is, the electrons traverse the sample as quantum mechanical plane waves experiencing no elastic or inelastic scattering events. Ballistic electrons can account for more than half ... |
|
| Electronic Properties of High-Tc Superconductors. The Normal and the Superconducting State of High-Tc Materials. Proceedings of the International Winter School held in Kirchberg, Tyrol on March 7 - 14, 1992 |
14 MAR 92 |
546 pages |
| Authors:
H. Kuzmany; M. Mehring; J. Fink; VIENNA UNIV (AUSTRIA)
|
| The International Winter School on Electronic Properties of High Temperature Superconductors, held between March 7-14, 1992, in Kirchberg,(Tyrol) Austria, was sixth in a series of meetings to be held at this venue. Four of the earlier meetings were dedicated to issues in the filed of conducting polymers, while the winter school held in 1990 was devoted to the new discipline of high- Tc superconductivity. This year's meeting constituted a forum ... |
|
| Inelastic Deformation and Fracture of Glassy Solids |
31 MAY 91 |
|
| Authors:
A. S. Argon; MASSACHUSETTS INST OF TECH CAMBRIDGE
|
| A general unified treatment of the phenomeriology and mechanisms on inelastic deformation in glassy media, ranging from polymers to metals to ceramics. |
|
| Pion Elastic and Inelastic Scattering from 15N |
MAY 91 |
181 pages |
| Authors:
David P. Saunders; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| Data were obtained on the Energetic Pion Channel and Spectrometer for elastic and inelastic pion scattering from ground state Nitrogen 15 nuclei. States observed here included those of 0.0, 5.27, 6.32, 7.16, 7.30, 7.57, 8.31, 8.57, 9.15, 9.76, 9.9, 10.7, 11.3, 11.9, 12.5, 12.9, 13.1, 14.1, 14.4, 14.6, 15. 0, 16.5, 16.9, 17.2, 17.6, 18.3, 18.7, 18.9 MeV excitation energies. Angular distributions were obtained for scattering at angles from 25 ... |
|
| An Intermolecular H-O Potential for Methyl Rotations in Solid Nitromethane |
APR 91 |
34 pages |
| Authors:
Betsy M. Rice; S. F. Trevino; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| A reliable determination of the (H-O) intermolecular potential by which of nitromethane interact with each other is presented. This effort is based upon a body of experimental information which is available on the crystal structure and the rotational properties of the methyl group of the molecule in the solid state. The crystal structure is known in the temperature range of 4 to 233 K. The rotational properties of the methyl ... |
|
| Exact Theory of Long-Wavelength One-Phonon Aplitudes in Atom-Surface Scattering |
18 FEB 91 |
18 pages |
| Authors:
M. Flatte; W. Kohn; CALIFORNIA UNIV SANTA BARBARA DEPT OF PHYSICS
|
| An expression is derived for the probability of creating or annihilating one long-wavelength surface or bulk phonon during a scattering event, which depends on the bulk elastic constants but is independent of the details of the atom-target potential and of force constant changes near the surface. This expression is exact if the inelastic scattering is weak (the meaning of which is explained in the text). This theory should be experimentally ... |
|
| Electron-Phonon Interaction and transport in Artificially Made Semiconductor Microstructures |
MAR 90 |
17 pages |
| Authors:
Sankar Das Sarma; MARYLAND UNIV COLLEGE PARK
|
| Our research accomplishments under this contract cover a wide area of transport and electron phonon interaction processes in artificially made semiconductor microstructures including a complete theory for picosecond relaxation phenomena and hot electron energy loss in semiconductor quantum wells and heterostructures, a theory for inelastic scattering in ballistic hot electron transistors, a theory for elementary excitations in low dimensional semiconductor microstructures, a theory for the quasiparticle properties of semiconductor microstructures ... |
|
| Quantum Corrections for Inelastic Atom-Surface Scattering |
21 JUN 89 |
22 pages |
| Authors:
J. H. Jensen; W. Kohn; CALIFORNIA UNIV SANTA BARBARA DEPT OF PHYSICS
|
| One derives simple and exact expressions for the leading quantum corrections to the angular and energy distributions of an atom scattered inelastically from a solid crystalline surface. The quantum corrections are given in terms of classical trajectories and equilibrium correlation functions for the solid surface. Our results are useful when the incident atom has an energy of about 1 electron volt and the surface has a temperature less than or ... |
|
| Studies of the Structure and Properties of Amorphous a-Zr76Fe24Hx |
31 MAY 89 |
12 pages |
| Authors:
R. C. Bowman Jr.; A. J. Maeland; K. M. Unruh; E. L. Venturini; J. J. Rush; AEROSPACE CORP EL SEGUNDO CA LAB OPERATIONS
|
| The a-Zr76Fe24Hx samples with x 140 irreversibly crystallizes into c-Zr(Hx) and ZrFe2. Keywords: Zirconium alloys, Iron, Amorphous alloys, hydrogen, Thermal stability, Metal hydrides, Mossbauer effect, Nuclear magnetic resonance, Glassy alloys. (AW) |
|
| Dynamics of Gas-Surface Interactions |
02 FEB 89 |
49 pages |
| Authors:
S. J. Sibener; CHICAGO UNIV IL JAMES FRANCK INST
|
| This research initiative has dealt with the interaction of atomic, molecular, electron, and optical beams with well-characterized single crystal surfaces. These studies were motivated by a desire to understand and control catalytic surface chemistry, the technological need to characterize the physical properties of thin films and surfaces, and the desire to understand how energy and momentum are exchanged at the surface of a material when it is subjected to gas-surface ... |
|
| The Physics of Electronic and Atomic Collisions. AIP Conference Proceedings 205 Held in New York on 25 July through 1 August 1989 |
89 |
|
| Authors:
A. Dalgarno; R. S. Freund; P. M. Koch; M. S. Lubell; T. B. Lucatorto; AMERICAN INST OF PHYSICS NEW YORK
|
|
| Orientation and Polarisation Effects in Reactive Collisions |
89 |
261 pages |
| Authors:
ROYAL SOCIETY OF CHEMISTRY LONDON (UNITED KINGDOM)
|
| Partial Contents: Alignment Measurements in Orbitally Selective Collision-induced Fluorescence; Alignment Effects involving Multiple Pathways: Electronic Energy Transfer of Sr 5s6p 1P1 with Rare Gases; Differential Scattering of Na(3P) from HF: Reactive and Non-reactive Processes; Orientational and Spin-orbital Dependence of Interatomic Forces; M(i) Selectivity in Collisional Energy Transfer between Alkali-metal Atoms; Determination of Molecular Orientation and Alignment from Polarized Laser Photofragmentation Measurements: Orientated CH3I Molecule Beams; Reactant Orientation-Product Polarisation Correlations: Collision ... |
|
| Three-State Model for Laser-Assisted Collisions |
89 |
20 pages |
| Authors:
P. R. Berman; NEW YORK UNIV NY DEPT OF PHYSICS
|
| A laser assisted collision (LAC) is one involving a combined collisional-radiative interaction. A typical laser assisted collision can be written as a reaction of the form. A sub I + h-bar omega yields A sub F, where I> and F> are composite initial and final states, respectively, of atoms A and A' which are undergoing the collision, and Omega is the frequency of the laser field which produces the transition ... |
|
| Elastic and Inelastic Scattering of Colloidal Particles |
OCT 88 |
4 pages |
| Authors:
Milton Kerker; CLARKSON UNIV POTSDAM NY
|
| This project has continued the experimental and theoretical investigation of surface enhanced Raman scattering of molecules adsorbed on silver colloids. It includes the combined enhancement of normal and resonance Raman scattering as well as the observation of each of these effect separately on the same substrate. In addition there were studies of chromate, molybdate and tungstate on colloidal silver. Theoretical studies included the effect on enhancement of adsorption within cavities ... |
|
| Effect of Finite Size on Magnetoresistance |
OCT 88 |
11 pages |
| Authors:
H. R. Lee; H. G. Oh; Thomas F. George; STATE UNIV OF NEW YORK AT BUFFALO AMHERST
|
| Finite size effects are studied for magnetoresistance in a disordered metallic system. Quantum corrections to the conductivity are strongly affected by the presence of an in-plane magnetic field in a thin film. They are also affected significantly by the boundaries of the finite quantum size. Expressions are obtained for the quantum correction to the conductivity due to both effects. The dephasing characteristic time scale due to the magnetic field is ... |
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Reports by Keyword(s)
INELASTIC SCATTERING
