scholarly journals Measuring Spin Relaxation Rates Using Satellite Exchange NMR Spectroscopy

2018 ◽  
Vol 57 (25) ◽  
pp. 7498-7502
Author(s):  
Gerard P. Robertson ◽  
Barbara Odell ◽  
Ilya Kuprov ◽  
Darren J. Dixon ◽  
Tim D. W. Claridge
Keyword(s):  
Nmr Spectroscopy ◽  
Spin Relaxation ◽  
Relaxation Rates

scholarly journals Measuring Spin Relaxation Rates Using Satellite Exchange NMR Spectroscopy

2018 ◽  
Vol 130 (25) ◽  
pp. 7620-7624
Author(s):  
Gerard P. Robertson ◽  
Barbara Odell ◽  
Ilya Kuprov ◽  
Darren J. Dixon ◽  
Tim D. W. Claridge
Keyword(s):  
Nmr Spectroscopy ◽  
Spin Relaxation ◽  
Relaxation Rates

NUCLEAR RELAXATION RATES, PENETRATION DEPTH, AND ENERGY-DEPENDENT GAP FUNCTIONS IN HIGH-Tc SUPERCONDUCTORS

1992 ◽  
Vol 06 (18) ◽  
pp. 1145-1150 ◽  
Author(s):  
Q. P. LI ◽  
ROBERT JOYNT
Keyword(s):  
Penetration Depth ◽  
Spin Relaxation ◽  
Nuclear Spin ◽  
High Temperature Superconductors ◽  
Gap Function ◽  
Gap Functions ◽  
Nuclear Spin Relaxation ◽  
Relaxation Rates ◽  
Relaxation Experiments ◽  
Energy Dependent

We study the experimental consequences of a gap function which is odd in energy. This type of gap may occur in high temperature superconductors. We show that nuclear spin relaxation experiments can be used to probe the "particle-hole parity" of a gap function. We find that an exponent α=1/3 which characterizes the energy dependence is in agreement with the currently available experimental data of both the nuclear spin relaxation rate (∝T(2-α)/α) and the electromagnetic penetration depth (∝T(1-α)/α).

Temperature Dependence of Exciton Spin Relaxation Rates in Semiconductor Quantum Dots

2007 ◽  
Author(s):  
A. Reznitsky ◽  
A. Klochikhin ◽  
S. Permogorov ◽  
L. Tenishev ◽  
K. Mironenko ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Temperature Dependence ◽  
Spin Relaxation ◽  
Semiconductor Quantum Dots ◽  
Relaxation Rates

Impact of molecular size on electron spin relaxation rates of nitroxyl radicals in glassy solvents between 100 and 300 K

2007 ◽  
Vol 105 (15-16) ◽  
pp. 2137-2151 ◽  
Author(s):  
H. Sato ◽  
V. Kathirvelu ◽  
A. Fielding ◽  
J. P. Blinco ◽  
A. S. Micallef ◽  
...  
Keyword(s):  
Spin Relaxation ◽  
Electron Spin ◽  
Molecular Size ◽  
Nitroxyl Radicals ◽  
Relaxation Rates ◽  
Electron Spin Relaxation

scholarly journals Triarylmethyl Radical: EPR Signal to Noise at Frequencies between 250 MHz and 1.5 GHz and Dependence of Relaxation on Radical and Salt Concentration and on Frequency

2017 ◽  
Vol 231 (4) ◽  
Author(s):  
Yilin Shi ◽  
Richard W. Quine ◽  
George A. Rinard ◽  
Laura Buchanan ◽  
Sandra S. Eaton ◽  
...  
Keyword(s):  
Spin Relaxation ◽  
Electron Spin ◽  
Salt Concentration ◽  
Spin Echo ◽  
Electron Spin Echo ◽  
Relaxation Rates ◽  
Optimum Frequency ◽  
Paramagnetic Resonance ◽  
Electron Spin Relaxation

AbstractIn vivo oximetry by pulsed electron paramagnetic resonance is based on measurements of changes in electron spin relaxation rates of probe molecules, such as the triarylmethyl radicals. A series of experiments was performed at frequencies between 250 MHz and 1.5 GHz to assist in the selection of an optimum frequency for oximetry. Electron spin relaxation rates for the triarylmethyl radical OX063 as a function of radical concentration, salt concentration, and resonance frequency were measured by electron spin echo 2-pulse decay and 3-pulse inversion recovery in the frequency range of 250 MHz–1.5 GHz. At constant OX063 concentration, 1/T

Ionic mobility in Nasicon-type LiMIV2(PO4)3 materials followed by 7Li NMR spectroscopy.

2011 ◽  
Vol 1313 ◽  
Author(s):  
K. Arbi ◽  
I. Sobrados ◽  
M. Hoelzel ◽  
A. Kuhn ◽  
F. Garcia-Alvarado ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Impedance Spectroscopy ◽  
Nmr Relaxation ◽  
Lattice Relaxation ◽  
Ionic Mobility ◽  
Spin Lattice Relaxation ◽  
Pulse Field ◽  
Relaxation Rates ◽  
Arrhenius Behavior ◽  
Spin Lattice

AbstractLithium mobility in LiM2(PO4)3 compounds, with M= Ge, Ti, Sn, Zr and Hf, has been investigated by 7Li Nuclear Magnetic Resonance (NMR) spectroscopy in the temperature range 100-500 K. From the analysis of 7Li NMR quadrupole interactions (CQ and η parameters), Li sites occupancy and exchange processes between structural sites have been studied. Below 250K, Li ions are preferentially located at M1 sites in rhombohedral phases, but occupy M12 sites in triclinic ones. At increasing temperatures, Li mobility has been deduced from spin-spin () and spin-lattice relaxation () rates. In this analysis, the presence of two relaxation mechanisms in plots has been associated with departures of conductivity from the Arrhenius behavior. At high temperatures, residence times at M12−T11−T11−T1 and M12 sites become similar and conductivity significantly increase. This superionic state can be achieved by enlarged order-disorder transformations in rhombohedral phases, or by sharp first order transitions in triclinic ones. Results described in the LiTi2(PO4)3 sample have been compared with those obtained in rhombohedral Li1+xTi2-xAlx(PO4)3 and LiTi2-xZrx(PO4)3 series showing respectively higher and lower conductivities. In the case of Li1.2Ti1.8Al0.2(PO4)3, displaying the highest reported conductivity, NMR results are discussed in relation with those obtained by Neutron Diffraction (ND) and Impedance Spectroscopy (IS). Diffusion coefficients determined by NMR Pulse Field Gradient (PFG) technique are similar to those deduced from Impedance Spectroscopy and NMR relaxation data.

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