Spin-Peierls fluctuations in(TMTTF)2Brstudied by pulsed electron spin resonance spin-lattice relaxation

2001 ◽  
Vol 64 (17) ◽  
Author(s):  
A. Zorko ◽  
D. Arčon ◽  
K. Biljaković ◽  
C. Carcel ◽  
J. M. Fabre ◽  
...  
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Spin Resonance ◽  
Resonance Spin

Electron spin resonance studies of radicals condensed from irradiated water vapor: paramagnetic relaxation of trapped electrons in ice

1969 ◽  
Vol 47 (12) ◽  
pp. 2155-2160 ◽  
Author(s):  
P. Wardman ◽  
W. A. Seddon
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Trap Depth ◽  
Lattice Relaxation ◽  
Relaxation Mechanism ◽  
Lattice Relaxation Time ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Spin Resonance ◽  
Fast Passage

The spin–lattice relaxation time T1 of electrons (et−) trapped in several ice matrices at 77 °K has been estimated to be of the order of 10−2 s by observation of the electron spin resonance (e.s.r.) dispersion signal under fast passage conditions. These studies, together with measurements of the microwave power saturation of the e.s.r. absorption signal indicate that there is little difference in T1 at 77 °K for et− in solute-free polycrystalline H2O or D2O ice, γ-irradiated 8 M NaOH/H2O or NaOD/D2O glassy ices, and in 8 M NaOD/D2O glasses in which the electrons were produced by photoionization of ferrocyanide ion. This indicates that the predominant spin–lattice relaxation mechanism is not cross relaxation, and that correlations between T1 and line width or trap depth are inappropriate.

Recombination of Optically Excited Carriers in a-Si:H at Low temperatures and Intermediate Times

2002 ◽  
Vol 715 ◽  
Author(s):  
J. Whitaker ◽  
T. Su ◽  
P. C. Taylor
Keyword(s):  
Electron Spin Resonance ◽  
Low Temperatures ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Dipolar Relaxation ◽  
Spin Lattice ◽  
Carrier Recombination ◽  
Nmr Data ◽  
Spin Resonance ◽  
Time Regime

AbstractOptically induced electron spin resonance (LESR) studies on time scales in between the previously published PL and LESR results (approximately 10 ms to 10 s) allow one to examine the cross over between energy-loss (downward) hopping of carriers and carrier recombination via tunneling. In addition, data in this time regime are directly compared in the same sample with NMR data on the dipolar spin-lattice relaxation of the bonded hydrogen where light induced electrons and holes are responsible for dipolar relaxation of bonded hydrogen. The LESR results confirm the interpretation of the NMR measurements.

Electron Spin Resonance of Mn2+ in Eu2M”3(NO3)12 · 24H2O (M” = Zn, Co) Single Crystals

2003 ◽  
Vol 58 (12) ◽  
pp. 677-681
Author(s):  
V. K. Jain
Keyword(s):  
Electron Spin Resonance ◽  
Single Crystals ◽  
Electron Spin ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Cobalt Ions ◽  
Spin Resonance ◽  
Divalent Cobalt

Electron spin resonance of Mn2+ doped in Eu2M”3 (NO3)12.24H2O (M” = Zn, Co) single crystals has been studied at 295 and 77 K using an X-band spectrometer. The observation of resolved Mn2+ spectra in Eu2Co3(NO3)12.24H2O at 295 K have been interpreted in terms of random modulation of interaction between Mn2+ and divalent cobalt ions by the rapid spin-lattice relaxation of cobalt ions. T1 of divalent cobalt has been estimated to be ∼ 5×10−12 s at 295 K. The superposition model is applied to the zero-field splitting parameter D.- PACS: 76.30 F

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