Abstract
The paramagnetic resonance spectrum of Yb+++ in gallium and aluminum garnets has been observed at liquid nitrogen and helium temperatures. The components of the principal g tensor are 2.85, 3.60, and 3.74 in gallium garnet, and 2.47, 3.78, and 3.87 in aluminum garnet. In aluminum garnet, for a range of Yb concentrations(relative to Y) of from 2% to .1%, the line width varies linearly from 98 gauss to 20 gauss. The longitudinal relaxation time T1, for the same Yb variation, increases from 0.001 sec to 0.02 sec.
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