Abstract
The diagonal modulation mechanism for optical dephasing of impurity transitions in amorphous solids is reexamined by utilizing nonphenomenological distribution functions for the two-level systems (TLS). With reasonable variations in the distribution function parameters, it is shown that the power law ..delta..omega proportional to T/sup n/ with 1.2 approximately less than or equal to n approximately less than or equal to 2 holds for a dipole-dipole interaction. However, off-diagonal modulation provides the same range in n. The problem of distinguishing between dephasing mechanisms is discussed.
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