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The orientational relaxation times and S1 singlet lifetimes for Rhodamine 6G molecules in various alcohols have been measured using mode-locked laser pulses in a transient induced grating technique. The transient grating technique can be applied to measure a variety of atomic and molecular excited state phenomena on subnanosecond to picosecond time scales.
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Phillion et al. (1975) studied this question.
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