RESONANCE MODES AT DEFECTS IN CRYSTALLINE QUARTZ.
Scientific rept. no. 1,
WESTINGHOUSE RESEARCH LABS PITTSBURGH PA
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The Raman spin-lattice relaxation time, T sub 1R, for the oxygen divacancy E sub 1 center in synthetic crystalline quartz measured in applied magnetic fields of 3 KOe is accurately given by 1T sub 1R Be to the x sub 1 power e to the x sub 1 power - 1 to the 2nd power C e to the x sub 2 powere to the x sub 2 power - 1 to the 2nd power D e to the minus x sub 3 power where the coefficients are B 0.25sec, C 250sec, D 300,000sec, and the characteristic frequencies have the corresponding temperatures of x sub 1T 20 2K, x sub 2T 125 10K, and x sub 3T 1400 300K. The two lower frequencies are interpreted in terms of mechanical resonances being localized at each center and having large resonant amplitudes. The highest frequency is tentatively associated with some of the optical modes of the SiO2 lattice. There is no evidence for relaxation by the acoustic modes having the normal Debye cutoff. Author