scholarly journals Electron spin dynamics and spin–lattice relaxation of trityl radicals in frozen solutions

2016 ◽  
Vol 18 (36) ◽  
pp. 24954-24965 ◽  
Author(s):  
Hanjiao Chen ◽  
Alexander G. Maryasov ◽  
Olga Yu. Rogozhnikova ◽  
Dmitry V. Trukhin ◽  
Victor M. Tormyshev ◽  
...  
Keyword(s):  
Electron Spin ◽  
Self Assembly ◽  
Nuclear Polarization ◽  
Spin Dynamics ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Frozen Solutions ◽  
Electron Spin Dynamics ◽  
Trityl Radical

Self-assembly of trityl radical aggregates dominates electron spin dynamics for dynamic nuclear polarization.

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

ELECTRON SPIN-LATTICE RELAXATION : A TOOL FOR THE INVESTIGATION OF PARAMAGNETIC CENTERS IN AMORPHOUS SEMI-CONDUCTORS

1981 ◽  
Vol 42 (C4) ◽  
pp. C4-1001-C4-1004
Author(s):  
A. Deville ◽  
B. Gaillard ◽  
C. Blanchard ◽  
J. Livage
Keyword(s):  
Electron Spin ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Paramagnetic Centers ◽  
Spin Lattice

Pulse Shaped Dynamic Nuclear Polarization Under Magic Angle Spinning

2019 ◽  
Author(s):  
ASIF EQUBAL ◽  
Kan Tagami ◽  
Songi Han
Keyword(s):  
Electron Spin ◽  
Lattice Relaxation ◽  
Magic Angle Spinning ◽  
Spin Lattice Relaxation ◽  
Magic Angle ◽  
Total Electron ◽  
Spin Lattice ◽  
Maximum Benefit ◽  
Selective Saturation ◽  
Angle Spinning

In this paper, we report on an entirely novel way of improving the MAS-DNP efficiency by shaped μw pulse train irradiation for fast and broad-banded (FAB) saturation of the electron spin resonance. FAB-DNP achieved with Arbitrary Wave Generated shaped μw pulse trains facilitates effective and selective saturation of a defined fraction of the total electron spins, and provides superior control over the DNP efficiency under MAS. Experimental and quantum-mechanics based numerically simulated results together demonstrate that FAB-DNP significantly outperforms CW-DNP when the EPR-line of PAs is broadened by conformational distribution and exchange coupling. We demonstrate that the maximum benefit of FAB DNP is achieved when the electron spin-lattice relaxation is fast relative to the MAS frequency, i.e. at higher temperatures and/or when employing metals as PAs. Calculations predict that under short T<sub>1e </sub>conditions AWG-DNP can achieve as much as ~4-fold greater enhancement compared to CW-DNP.

Novel spin dynamics in ferrimagnetic molecular chains from NMR and μSR spin–lattice relaxation measurements

2004 ◽  
Vol 272-276 ◽  
pp. 1087-1088 ◽  
Author(s):  
E. Micotti ◽  
A. Lascialfari ◽  
A. Rigamonti ◽  
S. Aldrovandi ◽  
A. Caneschi ◽  
...  
Keyword(s):  
Spin Dynamics ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Relaxation Measurements

scholarly journals Electron Spin-Lattice Relaxation in Polymers and Crystals Related to Disorder and Structure Defects

2003 ◽  
Vol 103 (4) ◽  
pp. 373-385 ◽  
Author(s):  
S.K. Hoffmann ◽  
W. Hilczer ◽  
T. Radczyk ◽  
I. Polus
Keyword(s):  
Electron Spin ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Structure Defects ◽  
Spin Lattice

The Raman electron spin-lattice relaxation process for diatomic molecules

Physica B+C ◽  
1987 ◽  
Vol 145 (2) ◽  
pp. 85-100
Author(s):  
G.D.F. van Velzen ◽  
W.Th. Wenckebach
Keyword(s):  
Relaxation Process ◽  
Electron Spin ◽  
Diatomic Molecules ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice
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