TITLE

Spin-lattice relaxation of the hydrogen atom in a fused quartz

AUTHOR(S)
Ichikawa, Tsuneki; Kurshev, Vadim
PUB. DATE
October 1993
SOURCE
Journal of Chemical Physics;10/15/1993, Vol. 99 Issue 8, p5728
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The paramagnetic spin-lattice relaxation of hydrogen atoms in γ-irradiated fused quartz at 77 K was measured by an electron spin echo method. The relaxation was induced by dipole interactions between electron spins, so that the relaxation rate increased with the concentration of the hydrogen atoms. The observed relaxation was compared with theoretical one in which the spin diffusion and the phonon-induced simultaneous transition of the electron spin state and the local vibrational state of the hydrogen atoms in trapping sites were taken into account. The theoretical relaxation behavior was in perfect accordance with the observed one. The relaxation was ten orders of magnitude accelerated by the spin diffusion of the hydrogen atoms, which indicates that the spin diffusion plays a significant role on the spin-lattice relaxation of paramagnetic species with small g anisotropy.
ACCESSION #
7649624

 

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