Abstract
Using monochromatic light from a frequency-doubled ruby laser and nanosecond time resolution, we have observed vibrational relaxation in the lowest triplet states of several aromatic vapours. A mechanism for vibrational relaxation is proposed and average amounts of energy removed per collision are determined for mixtures of buffer gas and anthracene. The pressure dependence of the triplet yield, upon excitation of anthracene at 347 nm, was also investigated.
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