Abstract
Dispersed phosphorescence and phosphorescence excitation spectra were obtained for gas-phase methyl benzoate. Relative phosphorescence quantum yields for methyl, ethyl, and n-butyl benzoate were determined for five excitation energies above the 0,0 band and of the second 1(π, π*) transition. The emitting state was assigned as the 3(n, π*) state. Relative phosphorescence yields were found to be inconsistent with trends expected for variation in either intersystem crossing rates or photodissociation rates as a function of alkyl chain length, strongly suggesting a competing molecular elimination process.
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