Electron Spin–Lattice Relaxation Mechanisms of Nitroxyl Radicals in Ionic Liquids and Conventional Organic Liquids: Temperature Dependence of a Thermally Activated Process

2015 ◽  
Vol 119 (12) ◽  
pp. 4501-4511 ◽  
Author(s):  
Krishnendu Kundu ◽  
Daniel R. Kattnig ◽  
Boryana Y. Mladenova ◽  
Günter Grampp ◽  
Ranjan Das
Keyword(s):  
Ionic Liquids ◽  
Temperature Dependence ◽  
Electron Spin ◽  
Lattice Relaxation ◽  
Nitroxyl Radicals ◽  
Spin Lattice Relaxation ◽  
Organic Liquids ◽  
Spin Lattice ◽  
Thermally Activated ◽  
Thermally Activated Process

Dielectric Behaviour of the Ferroelectric AgNa(NO2)2 and Spin Lattice Relaxation of 23Na

1974 ◽  
Vol 29 (7) ◽  
pp. 1055-1059 ◽  
Author(s):  
J. Grossmann ◽  
D. Müller ◽  
J. Petersson
Keyword(s):  
Pulse Sequences ◽  
Lattice Relaxation ◽  
Lattice Relaxation Time ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Thermally Activated ◽  
Small Influence ◽  
Nuclear Spin Lattice Relaxation ◽  
Diffusional Motion ◽  
Thermally Activated Process

The characteristic ferroelectric dispersion of the dielectric constant of AgNa(NO2)2 is measured near the ferroelectric phase transition. In accordance with other works an extremely slow relaxation is observed which can be related to a thermally activated motion of the electrical dipoles. The nuclear spin lattice relaxation time T1 of 23Na in AgNa(NO2)2 is measured by 90° - t-90° pulse sequences. In the entire temperature range the temperature dependence of T1 is governed by a thermally activated process which is ascribed to a diffusional motion. There is only a small influence of the dielectric instability on T1.

Chlorine NQR Spin-Lattice Relaxation and Electron Spin Dynamics in Paramagnetic [Co(H2O)6[PtCl6]

1991 ◽  
Vol 46 (12) ◽  
pp. 1103-1107 ◽  
Author(s):  
Motohiro Mizuno ◽  
Tetsuo Asaji ◽  
Atsushi Tachikawa ◽  
Daiyu Nakamura
Keyword(s):  
Temperature Dependence ◽  
Electron Spin ◽  
Correlation Time ◽  
Spin Exchange ◽  
Energy Gap ◽  
Spin Dynamics ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice

Abstract Chlorine NQR spin-lattice relaxation times T1Q were determined for [Co(H2O)6][PtCl6] at 4.2 400 K. Above ca. 350 K, T1Q decreased rapidly showing the onset of a reorientation of [PtCl6]2-. The activation energy Ea of this reorientation was determined as 125 ± 15 kJ mol-1. With decreasing temperature, T1Q showed a maximum at ca. 250 K. Below ca. 200 K, T1Q. is governed by the magnetic dipolar interaction between chlorines and paramagnetic Co2+ ions and is inversely proportional to the electron spin correlation time τe of CO2+ . τe is shown to be determined by the electron spin-lattice relaxation time T1e and the temperature independent correlation time rs for the spin-exchange between neighbouring ions above and below ca. 50 K, respectively. The temperature dependence of T1e is explained by assuming the Orbach process with an energy gap A/k of 530 + 20 K as T1e = 5 x 10-14 exp(530/T)s. τs was estimated to be 0.9 x 10-10 s. The temperature dependence of the ESR linewidth of Mn2+ impurities in single crystal was also measured, intending to study Co2+ spin dynamics. The limit of the ESR method is discussed by comparing the obtained results with those of the NQR method

scholarly journals Electron spin–lattice relaxation of nitroxyl radicals in temperature ranges that span glassy solutions to low-viscosity liquids

2008 ◽  
Vol 191 (1) ◽  
pp. 66-77 ◽  
Author(s):  
Hideo Sato ◽  
Steven E. Bottle ◽  
James P. Blinco ◽  
Aaron S. Micallef ◽  
Gareth R. Eaton ◽  
...  
Keyword(s):  
Electron Spin ◽  
Lattice Relaxation ◽  
Nitroxyl Radicals ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Low Viscosity ◽  
Temperature Ranges
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