| Solid State Quantum Computer in Silicon |
30-Sep-2008 |
47 pages |
| Authors:
R G Clark; A S Dzurak; M Y Simmons; D N Jamieson; S Prawer; L C Hollenberg; J C McCallum; NEW SOUTH WALES UNIV SYDNEY (AUSTRALIA) RESEARCH OFFICE GRANTS SUPPORT SECTION
|
 | A Si:P electron-spin qubit architecture was developed in 2008, based upon research outcomes over the four-year QCCM grant. Single-shot spin readout will proceed via spin-dependent tunneling to a Si MOS rf-SET, which we have demonstrated to posses charge sensitivities equal to or better than Al rf-SETs. Spin manipulation will occur using local electron-spin resonance (ESR), which we have used to observe hyperfine-split electron spin resonances in P-doped Si MOSFETs. This ... |
|
| Characterizing the Dynamic Response of the Estrogen Receptor to Agonists and Antagonists by Multifrequency Electron Spin Resonance Spin-Labeling |
May-2008 |
14 pages |
| Authors:
David E Budil; NORTHEASTERN UNIV BOSTON MA
|
| The overall objective of this project is to characterize the detailed structural and dynamic response of the estrogen receptor ligand binding domain (ER-LBD) to a variety of ligands ranging from strong estrogens to strong antiestrogens using electron spin labeling. The first two technical aims for this reporting period involved completing preparation of site-directed spin-labeled mutants of the ERLBD and completing synthesis new spin-labeled ligands for the proposed studies. These tasks ... |
|
| Solid-State Nuclear Magnetic Resonance Investigations of Microwave Tube Cathode Structure |
30 NOV 2007 |
6 pages |
| Authors:
K. A. Smith; NEW MEXICO UNIV ALBUQUERQUE OFFICE OF RESEARCH SERVICES
|
| The objective of this work was to determine if Solid-State Nuclear Magnetic Resonance (NMR) would be able to determine what chemical or structural changes occur during treatment of carbon fibers by CsI, and during operation of treated cathodes. It was known that CsI treated carbon fibers are superior to either solid CsI or untreated fibers when used as cathodes for high power microwave production. For C-13 NMR, probe background was ... |
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| Characterizing the Dynamic Response of the Estrogen Receptor to Agonists and Antagonists by Multi-frequency Electron Spin Resonance Spin-Labeling |
MAY 2007 |
8 pages |
| Authors:
David E. Budil; Robert N. Hanson; NORTHEASTERN UNIV BOSTON MA
|
| The overall objective of this project is to characterize the detailed structural and dynamic response of the estrogen receptor ligand binding domain (ER-LBD) to a variety of ligands ranging from strong estrogens to strong antiestrogens using electron spin labeling. The technical aims for the initial period involved developing site-directed spin-labeled mutants of the ER-LBD and synthesizing new spin-labeled ligands for the proposed studies. We have optimized cell culture production of ... |
|
| Electric-Field Effects in ESR Spectrum of Low-Spin Center Ni3+ in KTaO3 Crystals (Preprint) |
APR 2007 |
7 pages |
| Authors:
L. S. Sochava; S. A. Basun; V. E. Bursian; A. G. Razdobarin; Dean R. Evans; RUSSIAN ACADEMY OF SCIENCES SAINT PETERSBURG IOFFE PHYSICAL-TECHNICAL INST
|
| Electric-field effects in ESR spectrum of low-spin (S=1/2) tetragonal center Ni3+ was studied in KTaO3 single crystals. Orientation of the centers as well as splitting of the resonance lines was found resulting from the external E-field interaction with the electric dipole moment of the center. The value of the dipole moment was determined to be p=103D=21.4 eAngstrom. An analysis of the experimental results allowed us to make a reasonable choice ... |
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| Single Spin Readout for the Silicon-Based Quantum Computer |
03 JAN 2007 |
13 pages |
| Authors:
P. C. Hammel; OHIO STATE UNIV COLUMBUS DEPT OF PHYSICS
|
| This report presents research funded under ARO grant DAAD19-02-1-0310 and conducted during the time period of 07/15/2002 - 07/14/2006. In the course of this research we have made major advancements in the development of Magnetic Resonance Force Microscopy (MRFM) on the way towards its application as a single spin readout for the silicon-based quantum computer. The main achievement of this work is the demonstration of electron spin resonance (ESR) signal ... |
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| Spin-Based Photonics via Electromagnetically Induced Transparency |
NOV 2006 |
4 pages |
| Authors:
Hailin Wang; J. Furdyna; R. Binder; OREGON UNIV EUGENE
|
| Research efforts have focused on the development and implementation of electromagnetically-induced transparency (EIT) from electron spin coherence in a semiconductor quantum well waveguide. Experimental studies have shown an induced transmission resonance arising from the electron spin coherence in the differential transmission spectrum. The induced resonance can be viewed as a signature of EIT from the electron spin coherence. Studies of the polarization and magnetic field dependence further confirm the physical ... |
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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
|
| 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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| Measurements of T2 of Electron Spins at Bound Donor Sites in Si:P |
17 NOV 2005 |
6 pages |
| Authors:
W. G. Clark; Karoly Holczer; Stuart Brown; Eli Yablonovitch; CALIFORNIA UNIV LOS ANGELES
|
| The goal of the project was to establish the limitations on the transverse spin relaxation of bound donors in dilute semiconductors, in particular in Si:P. The experiments were undertaken in two steps, first using the existing pulsed EPR spectrometer in Prof. Holczer's laboratory, and then extending to longer times after obtaining an upgrade in hardware from Bruker Biospin Corporation. |
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| Electron Spin Decoherence Times in Si-Based Structures |
11 NOV 2005 |
6 pages |
| Authors:
Stephen A. Lyon; PRINCETON UNIV NJ DEPT OF ELECTRICAL ENGINEERING
|
| This project addressed several major questions concerning the coherence of electron spins in Si-based structures. Decoherence of the qubits is a fundamental limitation of any quantum computing device. Our goal is to understand the origin of spin decoherence for both free and bound electrons in Si. We have found that electrons bound to donors can have extremely long coherence times in isotopically enriched 28Si, with the ratio of their coherence ... |
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| Special Technology Area Review on Spintronics. Report of Department of Defense Advisory Group on Electron Devices Working Group B (Microelectronics) |
JUN 2004 |
34 pages |
| Authors:
Barry Dunbridge; Les Palkuti; Stuart Wolf; OFFICE OF THE UNDER SECRETARY OF DEFENSE FOR ACQUISITION TECHNOLOGY AND LOGISTICS WASHINGTON DC
|
| The objective of this Advisory Group on Electron Devices (AGED) Working Group B (Microelectronics) Special Technology Area Review (STAR) was to examine the status of spintronics (electronics based on the spin degree of freedom of the electron) as it applies to nonvolatile memories and quantum-based logic and computing. In addition, the information provided at the STAR is expected to be of use to the Services and Department of Defense (DoD) ... |
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| Fundamental Studies of ESR and Optical Bulk Quantum Computing |
APR 2004 |
12 pages |
| Authors:
Warren S. Warren; PRINCETON UNIV NJ
|
| Solution NMR quantum computers are fundamentally limited to small numbers of qubits because energy differences are small compared to kT, and the logic gates that can be created are extremely slow (ca. 100 ms) (see W. S. Warren, Science 277, 1688-1689 (1997)). We proposed to explore the technological and architecture issues associated with two other classes of bulk quantum computing systems: ESR and optical impurity molecules in a dilute lattice. ... |
|
| Electron Spin Relaxation in Zinc-Blende Heterostructures |
23 JUN 2000 |
3 pages |
| Authors:
N. S. Averkiev; L. E. Golub; M. Willander; RUSSIAN ACADEMY OF SCIENCES SAINT PETERSBURG IOFFE PHYSICAL-TECHNICAL INST
|
| Spin relaxation in-plane anisotropy is predicted for heterostructures based on zinc-blende semiconductors. It is shown that it manifests itself especially brightly if the two spin relaxation mechanisms (Dyakonov-Perel and Rashba) are comparable in efficiency. It is demonstrated that for the quantum well grown along the 001 direction, the main axes of spin relaxation rate tensor are 110 and 110. |
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| Investigations of the Temperature and Concentration Dependencies of ESR Spectrum of Residual Donors in N-Type Bulk 6H SiC |
05 JUN 1998 |
20 pages |
| Authors:
Ekaterina Kalabukhova; UKRAINIAN ACADEMY OF SCIENCES KIEV INST OF SEMICONDUCTOR PHYSICS
|
| This report results from a contract tasking Institute of Semiconductor Physics as follows: The contractor will investigate the ESR spectra of n-type 6H SiC over wide temperature and concentration ranges to establish the number of residual donors inherent in the 6H SiC polytype and their energy characteristics. |
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| The ESR Characterization of Oligomeric Thiophene Materials |
28 JUN 94 |
30 pages |
| Authors:
James R. Diers; M. K. DeArmond; John Guay; Art Diaz; Rulian Wu; SOUTH CAROLINA UNIV COLUMBIA
|
| The ESR of electro-oxidation products of orthogonally bridged dimers of alpha,alpha-coupled thiophene oligomers and spiro-fused phenylene-thiophene mixed oligomers was studied as a function of temperature. ESR measurements on the one electron oxidation products indicate that the charge remains on a single oligomer unit and does not hop between the two bridged oligomer chains for temperatures up to 300K. This is evident from the presence of hyperfine structure in ESR spectra ... |
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| Determination of Hyperfine Splittings of Biradical Termini by Combining Biradical Trapping and Time-Resolved ESR Techniques |
1993 |
8 pages |
| Authors:
Igor V. Koptyug; Naresh Ghatlia; Nicholas J. Turro; William S. Jenks; COLUMBIA UNIV NEW YORK DEPT OF CHEMISTRY
|
| ESR detection of spin-polarized short-lived biradicals has been shown to be a valuable tool in studying the mechanisms of photochemical reactions and in the investigation of the properties of biradicals. However, some important spectroscopic features of these species are not readily available because of certain peculiarities of biradical ESR spectra. This difficulty can be overcome through the conservation of spin polarization by the controlled scavenging of a biradical into a ... |
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| Electron Spin Resonance and Radiation Effects in MOS Devices |
OCT 90 |
90 pages |
| Authors:
P. M. Lenahan; M. A. Jupina; PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF ENGINEERING SCIENCE AND MECHA NICS
|
| The basic mechanisms were explored of radiation damage in metal/ oxide/silicon (MOS) field effect transistors (MOSFET's) with a combination of electron spin resonance (ESR) and electrical measurements. The major focus has been develop a new and much more sensitive ESR technique called spin dependent recombination (SDR) to study radiation damage in MOSFET's. Keywords: Metal oxide semiconductors; Field effect transistors; Electron spin resonance; Radiation effects. (rh) |
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| ESR Base: An Electron Spin Resonance Spectrum Baseline Correction Routine Using Chebyschev Polynomials |
MAR 89 |
63 pages |
| Authors:
Joseph A. Menapace; FRANK J SEILER RESEARCH LAB UNITED STATES AIR FORCE ACADEMY CO
|
| An electron spin resonance (ESR) spectrum baseline correction routine is presented for use in modeling correcting experimental ESR spectral data. The routine corrects for baseline intensity drift by approximating the baseline using a Chebyschev (power-series) polynomial expansion. The correction routine's source code is written in FORTRAN 77 and accepts computerized ESR spectral data as input from files written in ASCII format. After correcting the baseline to zero intensity, the routine ... |
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| FILMCAL: An ESR (Electron Spin Resonance) Simulation Program for Transition Metals in Phthalocyanine Films |
24 FEB 89 |
28 pages |
| Authors:
M. D. Pace; S. M. Masumura; NAVAL RESEARCH LAB WASHINGTON DC
|
| A computer program, written in FORTRAN, was developed to simulate ESR spectra of transition metal ions in thin layer phthalocyanine films. The spectral calculation is based on Gaussian distribution of orientations of the molecules plane of the phthalocyanine with respect to the surface of the film. Four 14N hyperfine interactions are included to simulate the coordination site of the transition metal ion. Keywords: Electron spin resonance, Electron paramagnetic resonance, Films, ... |
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| Photorefractive Damage Mechanism in Electro-Optic Materials |
01 MAR 88 |
|
| Authors:
Larry E. Halliburton; OKLAHOMA STATE UNIV STILLWATER DEPT OF PHYSICS
|
 | The photo-induced redistribution of charge has been characterized in Bi12GEO20 and Bi12Sio20 crystals using electron spin resonance, thermally stimulated luminescence, and optical absorption techniques. Our results suggest that Fe3+ ions play an important role in the photorefractive effect in these materials. Keywords: Bismuth compounds, Silicon compounds, Germanium compounds. |
|
| Electronic Structure of Interface States of MOS and SOS Device Materials |
23 AUG 86 |
|
| Authors:
B. Henderson; STRATHCLYDE UNIV GLASGOW (SCOTLAND) DEPT OF PHYSICS
|
| The use of ion implantation in silicon device fabrication is known to give rise to defects both in the silicon and oxide. Some of these defects may be capable of withstanding even high temperature (1000C) anneals. Renewed interest in ion implantation in Si/SiO2 device structures in recent years has led to the use of a variety of experimental techniques to investigate the nature of damage produced by implantation of ions ... |
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| Dynamic Properties of Electronic Trapping Centers at the Si-SiO2 Interface |
MAY 1983 |
|
| Authors:
N. M. Johnson; XEROX PALO ALTO RESEARCH CENTER CA GENERAL SCIENCES LAB
|
| On unannealed, thermally oxidized silicon, electron spin resonance reveals an oriented interface defect which is termed the Pb center and identified as the trivalent silicon defect. Deep-level transient spectroscopy (DLTS) reveals two broad characteristic peaks in the interface-state |
|
| Optical Detection of Electron Spin Resonance in Compound Semiconductors |
31 MAR 1982 |
|
| Authors:
Brian Henderson; TRINITY COLL DUBLIN (IRELAND) PHYSICAL LAB
|
| The electronic structures of defects and impurities in GaSe-S alloys, GaAs:Cr, GaAs: Zn, ColTe and Si/Si02 have been investigated using the techniques of optically detected magnetic resonance (ODMR) and spin sensitive photoconductivity (SSP). In GaSe-S the ODMR has been used to study a wide range of triplet states. The photoluminescence bands associated with triplet state deexcitation change linearly with composition. The g-values of the triplet state ODMR as well as ... |
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| Nonlinear Interactions between Laser Radiation and Spin-Aligned Carriers in Semiconductors. |
25 NOV 1980 |
|
| Authors:
E. J. Johnson; R. W. Davies; A. Lempicki; GTE LABS INC WALTHAM MA
|
| The central theme of this work is the effect of radiation upon the vector orientation of characteristic properties of photo-excited carriers in semiconductors. The orientation is referred to the direction of propagation and the polarization state of the exciting light. Initially the emphasis was on the optical properties of spin-aligned electrons, particularly their behavior in stimulated emission. The scope was extended to include ordering of orbital angular moments, and electron ... |
|
| AB Initio Configuration Interaction Calculations on the States of HF(-), |
SEP 1980 |
|
| Authors:
Kathleen A. Wolf; RAND CORP SANTA MONICA CA
|
| The principles that form the basis of all quantum mechanics were first introduced in 1926 by Schroedinger. Since that time these principles have been extended to become the framework of the theory used today. Although the simplicity of the theory cannot be questioned, practical implementation of the basic concepts has often proven difficult. For certain applications, including the hydrogen atom as well as other one electron systems, the Schroedinger Theory ... |
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| Branching Ratios of Hg 5d and Cd 4d: Dirac-Fock Calculations |
27 JUN 1980 |
|
| Authors:
B. R. Tambe; Warren Ong; Steven T. Manson; GEORGIA STATE UNIV ATLANTA
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|
| Electron Spin Resonance of O(17)-Labeled Protein-Peroxide Radicals: Zein and Edestin (Oxygenated Free Radicals/Electron Spin Resonance Spectra/O(17) Hyperfine structure), |
22 OCT 1979 |
|
| Authors:
Louis J. Dimmey; Walter Gordy; DUKE UNIV DURHAM NC DEPT OF PHYSICS
|
|
| Electron Spin Resonance Studies of Hydrogen and Deuterium Bombardment of Unsaturated Hydrocarbons At 77K. |
JUL 1979 |
|
| Authors:
Cornelius U. Morgan; Kevin J. White; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The interaction of free atoms and radicals with unsaturated compounds has been a field of considerable interest. In this present work, the reactions of solid unsaturated hydrocarbons at 77K with gaseous hydrogen atoms are studied by electron spin resonance (esr). The hydrogen atom adds directly to the terminal position of the double bond of trans-2-butene, 2,3-dimethyl-1, 3-butadiene, 2-methyl-1-butene-3-yne, 3,3-dimethyl-1-butene, isobutylene, ethylene, and propylene to produce the sec-butyl, 2,3-dimethyl-2-butenyl, 1,1-dimethyl-2-propynyl, 1,2,2-trimethyl ... |
|
| Computer Controlled ESR. |
APR 1979 |
|
| Authors:
Ira B. Goldberg; ROCKWELL INTERNATIONAL THOUSAND OAKS CALIF SCIENCE CENTER
|
| Research in the development and application of a computer-controlled EPR spectrometer is described. The limitations and advantages of the computer are discussed in conjunction with studies on unstable organic radical ions, precision of g-factor and hyperfine splitting, measurements, line-shape analysis and determination of transient lifetimes. The computer permitted considerably greater precision in analytical measurements allowing accuracies of + or - 1%. Various data processing algorithms are also briefly discussed. (Author) ... |
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| A Versatile Approach for Investigating Site Separation in Functionalized Organic Polymers Containing Certain Donor Groups. |
01 FEB 1979 |
|
| Authors:
Russell S. Drago; John H. Gaul; ILLINOIS UNIV AT URBANA-CHAMPAIGN DEPT OF CHEMISTRY
|
| Resins containing pendant chloromethyl groups were prepared by suspension co-polymerization techniques and functionalized with imidazole. This imidazole polymer, at various percent crosslinking and loading was used to examine the utility of Co(DPGB)2-2MeOH as a reagent to investigate the existence of isolated functionalized sites in the resin. In this study, Co(DPGB)2-2MeOH is attached to the imidazole containing polymer via axial coordination and the resulting polymer complexes studied by ESR. The ESR ... |
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| Electron Spin Resonance Studies of Free Radicals in Energetic Materials. |
01 NOV 1978 |
|
| Authors:
W. B. Moniz; A. D. Britt; NAVAL RESEARCH LAB WASHINGTON D C
|
| Chemical reactions between fracture-induced free radicals in nylon 6 and energetic materials were explored. It was determined that picric acid (2,4,6-trinitrophenol) and nitrobenzene reacted with initial nylon 6 mechano-radicals but not with secondary nylon 6 radicals. Upon UV irradiation triaminotrinitrobenzene (TATB) forms free radicals which are thermally stable to at least 220 C. At 300 C they decay with a half-life of 20 minutes to a second radical having a ... |
|
| An ESR Study of Titanium(III) Exchanged Zeolite A. |
01 SEP 1978 |
|
| Authors:
Steven M. Kuznicki; K. Larry DeVries; Edward M. Eyring; UTAH UNIV SALT LAKE CITY DEPT OF CHEMISTRY
|
| A comparison of the chemical reactivity of Ti(III) cations in A type and Y type zeolite lattices has been performed by the use of electron spin resonance. While the state of the Ti(III) cation is similar in the two types of lattices, the reactions of absorbed gases with the two titanium (III) exchanged zeolites are strikingly different. The formation of a Ti(IV)-04- radical in zeolite A is suggested. (Author) |
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| I. Spin-Lattice Relaxation of Dilute Solutions of Polarized He3 in Liquid He4 in Low Magnetic Fields at 4 K. II. An Analysis of a Proposed Cryogenic He3 Nuclear Gyroscope and Its Application to a Nuclear Electric-Dipole Moment Experiment |
AUG 1978 |
|
| Authors:
Michael A. Taber; STANFORD UNIV CALIF DEPT OF PHYSICS
|
| Measurements were made of the spin-lattice nuclear relaxation time of 0.07% solutions of polarized helium-3 in liquid helium-4 at 4 K by use of an rf- biased SQUID (Superconducting Quantum Interference Device) magnetometer in magnetic fields ranging between 30 microGauss and 3 milliGauss. After the effect of magnetic-gradient-induced relaxation was subtracted by extrapolation to large magnetic fields, it was found that the relaxation time was 40 hours in a 1 ... |
|
| Electron Spin Resonance Spectra of the (14)NF3(+) and (15)NF3(+) Radical Cations, |
18 APR 1978 |
|
| Authors:
I. B. Goldberg; H. R. Crowe; K. O. Christe; ROCKWELL INTERNATIONAL THOUSAND OAKS CA SCIENCE CENTER
|
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| ESR Centers and Charge Defects Near the Silicon/Silicon Dioxide Interface. |
APR 1978 |
|
| Authors:
Edward H. Poindexter; Edwin R. Ahlstrom; Philip J. Caplan; ARMY ELECTRONICS RESEARCH AND DEVELOPMENT COMMAND FORT MONMOUTH NJ ELECTRONICS TECHNOLOGY/DEVICES LAB
|
| The Nishi-B esr center has been examined as a function of thermal oxidation and annealing conditions in single-crystal silicon wafers. It was observed that B concentration was not correlated with fixed surface-state charge density Q, despite some similarities in their behavior. In freshly oxidized wafers, B typically ranges up to 200 per nm sq, and Q up to 50 per nm sq. The concentration of B is highly dependent on ... |
|
| An Investigation of the First Row Transition-Metal Fluoride Molecules using ESR Spectroscopy. |
1978 |
|
| Authors:
T. C. DeVore; R. J. Van Zee; W. Weltner Jr; FLORIDA UNIV GAINESVILLE DEPT OF CHEMISTRY
|
|
| Electron Spin Resonance of the Radical Complexes (NO2)2, (t-BuO)2, and (CH3)2 in an Argon Matrix at 10K. |
NOV 1977 |
|
| Authors:
Cornelius U. Morgan; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| In the present electron spin resonance (esr) study nitrate esters or t-butyl peroxide in an inert gas (1:100) are pyrolyzed to produce the monoradicals NO2, CH3, and t-BuO. The pyrolysis products and inert gas are collected as a solid at 10K. In the solid phase some of the monoradicals associate to form the radical complexes (NO2)2, (CH3)2, and (t-BuO)2. The integrated intensity of the complex in these cases is always ... |
|
| Contributions of Membrane Components to Intracellular Water Order. The Current Status. |
27 SEP 1977 |
|
| Authors:
Philip D. Morse II; WAYNE STATE UNIV DETROIT MICH DEPT OF BIOLOGY
|
| Methods are described for measuring intracellular viscosity by electron spin resonance and show results obtained for red blood cells, red blood cell ghosts, chloroplasts, and artificial lipid vesicles. The conclusions from these studies are that membrane proteins may be strong contributors to water order within cells and organelles. Detailed descriptions are provided for the methods developed for use in this project. These include preparing a sample for measuring its internal ... |
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| Improving the Analytical Accuracy of Electron Spin Resonance Spectrometry. |
22 AUG 1977 |
|
| Authors:
Ira B. Goldberg; ROCKWELL INTERNATIONAL THOUSAND OAKS CALIF SCIENCE CENTER
|
| Sources of error in Analytical Electron Spin Resonance Spectrometry are discussed. Errors due to gain of the lock in amplifiers and modulation amplitude settings can be reduced if the settings are properly calibrated or if the attenuators are rebuilt. It is also necessary that the incident microwave power level is monitored and that the cavity is reproducibly tuned. A method of correction for incomplete integration of Lorentzian lines is discussed. ... |
|
| Analysis of the Electron Spin Resonance of Spin Labels Using Chemometric Methods. |
30 MAY 1977 |
|
| Authors:
J. R. Koskinen; Bruce R. Kowalski; WASHINGTON UNIV SEATTLE LAB FOR CHEMOMETRICS
|
| Chemometric methods are used to show that certain ESR spectra of a model membrane system are a composite of spectra of an immobilized spin label and a mobil spin label. (Author) |
|
| Analytical Applications of Electron Spin Resonance. |
SEP 1976 |
|
| Authors:
Ira B. Goldberg; ROCKWELL INTERNATIONAL THOUSAND OAKS CALIF SCIENCE CENTER
|
| This report reviews applications of electron spin resonance (ESR) to chemical analysis. Basic theory of ESR and the instrumentation required for chemical analysis is discussed. The theory of ESR absorption is presented for the general case, and simplified forms for specific conditions are derived. These are applicable to solid, liquid and gas phase analysis of paramagnetic materials. Finally, specific techniques which utilize ESR are described. The application of the computer ... |
|
| The Electron Spin Resonance Determination of Site Populations in Erbium Doped Calcium Fluoride. |
03 JUN 1976 |
|
| Authors:
Danny Hilton Mills; NAVAL ACADEMY ANNAPOLIS MD
|
| The populations of erbium ions in the tetragonal, cubic, and trigonal sites in CaF2 crystals were measured for concentrations of .01 o/o, .03 o/o, .1 o/o, and .3 o/o erbium in CaF2 crystals. Experimental results show that the relative population of erbium ions in the cubic (quasi-cubic or perhaps aggregate) site increased as the concentration of total erbium ions increased while the relative site population in the tetragonal site decreased ... |
|
| Electron Spin Resonance Spectra of Tert-Butyl Substituted Naphthalene Anion Radicals. |
15 MAY 1976 |
|
| Authors:
Ira B. Goldberg; ROCKWELL INTERNATIONAL THOUSAND OAKS CALIF SCIENCE CENTER
|
| The hyperfine splittings (hfs) of the ring protons and the g-factors of seven tert-butylnaphthalene anions were measured. The hfs data was utilized in a multiple linear least squares analysis in order to determine parameters for use in an additivity model. This gives satisfactory prediction of the ring proton hfs. Factors were similarly treated. The hfs additivity parameters were correlated against those determined for methyl substituents and were found to be ... |
|
| ESR Study of the Association of 1,8-Di-tert-Butylnaphthalene Anions with Sodium and Potassium Cations. |
MAY 1976 |
|
| Authors:
Ira B. Goldberg; Harry R. Crowe; ROCKWELL INTERNATIONAL THOUSAND OAKS CALIF SCIENCE CENTER
|
| Electron spin resonance studies of the association of the non-planar 1,3,8-tri-tert-butylnaphthalene or 1,3,6,8-tetra-tert-butylnaphthalene anions with alkali metal cations revealed an alternating linewidth arising from cation motion between opposite sides of the median plane. The rates of motion were determined from simulation of the spectra. Activation energies determined from the rates were small and either postive or negative for loose ion pairs. The apparent negative activation energy was attributed to changes ... |
|
| Modulation Broadening of Second Derivative Gaussian and Lorentzian Lines. |
FEB 1976 |
|
| Authors:
A. W. Johnson; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| The broadening of second derivative Gaussian and Lorentzian absorption lines has been calculated as a function of modulation amplitude. It is shown that Lorentzian lines are more sensitive to modulation-induced distortion than Gaussian lines. For modulation levels less than 0.2 (half-width at half-height), broadening is less than 1% for Gaussian lines and 2% for Lorentzian lines. (Author) |
|
| Relaxation Processes in Magnetic Systems. |
30 DEC 1975 |
|
| Authors:
Thomas A. Kitchens; OFFICE OF NAVAL RESEARCH LONDON (ENGLAND)
|
| The British Radio-Spectroscopy Group met at the University of Bristol 3-4 September, 1975, to discuss relaxation in magnetic systems. A historical review of early experiments pertaining to 'spin' of electrons and nuclei by Dr. E. E. Schneider of Newcastle upon Tyne. Thirteen talks were given on relaxation effects in magnetic systems investigated by nuclear magnetic and electron spin resonance techniques. |
|
| STUDIES OF SOLIDS AT LOW TEMPERATURES |
APR 1963 |
28 pages |
| Authors:
ALABAMA UNIV UNIVERSITY
|
| Radical species which are stable only at low temperatures are investigated by electron spin resonance and optical methods. The initial compound chosen for study was KH2PO4, the deuterated compound also being included in this investigation. 50-kv x-rays produce free radicals in this compound which appear to be completely stable at liquid air temperatures, but decay rapidly above about 140K. Complete orientation data were taken on this compound about all three ... |
|
| PHYSICO-CHEMICAL STUDIES ON THE MICROSOMAL RIBONUCLEOPROTEIN PARTICLES |
14 MAR 1963 |
23 pages |
| Authors:
Akira Inouye; KYOTO UNIV (JAPAN)
|
| By ESR spectra and magnetic susceptibility measurement, the ferromagnetic behavior of liver ribosome, ribosomal RNA and thymus DNA was studied. The results obtained strongly suggested that RNA and DNA of high molecular weight are ferromagnetic in themselves and hence they would be so even in the ribosomes or nuclei. Some studies on the brain microsomes were made. Using the method of isolating liver ribosome, it was found that brain ribosomes ... |
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Reports by Keyword(s)
*ELECTRON SPIN RESONANCE
