Microscopic Identification of Anion Antisite Defects in GaAs by Optically Detected Magnetic Resonance

1985 ◽  
Vol 46 ◽  
Author(s):  
J. Martin Spaeth ◽  
Detlev M. Hofmann ◽  
Bruno K. Meyer
Keyword(s):  
Double Resonance ◽  
Lattice Relaxation ◽  
Lattice Relaxation Time ◽  
Spin Lattice Relaxation ◽  
Electron Nuclear Double Resonance ◽  
Spin Lattice ◽  
Esr Spectrum ◽  
Microscopic Identification ◽  
Antisite Defects ◽  
Optically Detected

AbstractAnion antisite defects in GaAs have been identified so far by their electron spin resonance (ESR) spectrum as one specific point defect, which was found in as-grown, plastically deformed and electron and neutron irradiated GaAs. By optical detection of electron nuclear double resonance (ODENDOR),it could be shown that several species of anion antisite defects exist having practically the same ESR spectrum, which cannot any longer be taken as “fingerprint” identification for this defect. Recent results of ODESR and ODENDOR investigations in as-grown, plastically deformed and electron irradiated GaAs are reviewed. It is also pointed out that the spin lattice relaxation time is an important quantity for the microscopic identification and the properties of anion antisite defects.

scholarly journals Inter-plane Coupling and Spin Gap -an NMR/NQR Look on Typical Properties of High-Temperature Superconductors

1996 ◽  
Vol 51 (5-6) ◽  
pp. 786-792
Author(s):  
D. Brinkmann
Keyword(s):  
Relaxation Time ◽  
Spin Echo ◽  
High Temperature Superconductors ◽  
Double Resonance ◽  
Lattice Relaxation ◽  
Lattice Relaxation Time ◽  
Spin Lattice Relaxation ◽  
Nmr Studies ◽  
Spin Gap ◽  
Spin Lattice

Abstract The paper discusses some NQR/NMR studies performed on Y-Ba-Cu-O superconductors at the University of Zürich. In particular, we review studies performed in Y2Ba4Cu7O15 by measuring various planar Cu NQR/NMR parameters: the spin-lattice relaxation time, the Knight shift and the indirect component of the Gaussian contribution to the spin-spin relaxation time. The temperature dependence of these parameters reveals a coupling between adjacent planes of a double plane. The existence of the inter-plane coupling has independently been confirmed by performing NQR Spin-Echo Double Resonance (SEDOR) experiments. The appearance of a spin gap seems to be the consequence of inter-plane coupling.

Nuclear-electron double resonance in solutions of potassium nitrosyl sulphonate and of potassium nitrosyl pentacyano chromium (III)

1962 ◽  
Vol 269 (1338) ◽  
pp. 287-300 ◽  
Keyword(s):  
Nuclear Polarization ◽  
Double Resonance ◽  
Lattice Relaxation ◽  
Lattice Relaxation Time ◽  
Spin Lattice Relaxation ◽  
Rate Equations ◽  
Spin Lattice ◽  
Dipole Interactions ◽  
Nuclear Spin Lattice Relaxation ◽  
Linear Manner

The effect on the nuclear resonance spectra of exciting the electron resonance in solutions of free radicals has been studied in a magnetic field of about 3000 G. The nuclei and electrons are coupled by dipole-dipole interactions. The nuclear polarization produced by a given microwave power varies in a roughly linear manner with the logarithm of the concentration of radical and this can be interpreted in terms of a set of rate equations relating the build up and decay of nuclear polarization. The presence of oxygen or of para ­ magneticions reduces the nuclear polarization obtainable, and it is established that this effect depends primarily on the change of the nuclear spin-lattice relaxation time. A quantitative discussion of these effects is given.

NUCLEAR SPIN-LATTICE RELAXATION TIME IN TIN

1978 ◽  
Vol 39 (C6) ◽  
pp. C6-1215-C6-1216
Author(s):  
H. Ahola ◽  
G.J. Ehnholm ◽  
S.T. Islander ◽  
B. Rantala
Keyword(s):  
Relaxation Time ◽  
Nuclear Spin ◽  
Lattice Relaxation ◽  
Lattice Relaxation Time ◽  
Spin Lattice Relaxation ◽  
Spin Lattice Relaxation Time ◽  
Spin Lattice ◽  
Nuclear Spin Lattice Relaxation

Protron spin-lattice relaxation time of duchenne dystrophy skeletal muscle by magnetic resonance imaging

1988 ◽  
Vol 11 (2) ◽  
pp. 97-102 ◽  
Author(s):  
Kiichiro Matsumura ◽  
Imaharu Nakano ◽  
Nobuo Fukuda ◽  
Hiroo Ikehira ◽  
Yukio Tateno ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Skeletal Muscle ◽  
Relaxation Time ◽  
Magnetic Resonance ◽  
Lattice Relaxation ◽  
Lattice Relaxation Time ◽  
Spin Lattice Relaxation ◽  
Resonance Imaging ◽  
Duchenne Dystrophy ◽  
Spin Lattice

Determination of chemical shift anisotropy tensor and molecular correlation time of proton pump inhibitor omeprazole by solid state NMR measurements

2020 ◽  
Vol 44 (44) ◽  
pp. 19393-19403
Author(s):  
Krishna Kishor Dey ◽  
Manasi Ghosh
Keyword(s):  
Correlation Time ◽  
Chemical Shift Anisotropy ◽  
Lattice Relaxation ◽  
Lattice Relaxation Time ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Structure And Dynamics ◽  
Molecular Correlation ◽  
Anisotropy Tensor

The correlation between the structure and dynamics of omeprazole is portrayed by extracting CSA parameters through the 13C 2DPASS CP-MAS SSNMR experiment, site specific spin–lattice relaxation time by Torchia CP experiment, and calculation of the molecular correlation time.

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