Abstract
The S 1←S 0 fluorescence excitation spectra of jet-cooled phenyl acetate were measured. The 0-0 band was observed at 37 553 cm −1, and short progressions with intervals of about 45 cm −1 were assigned to the Ph–O torsional mode. The progression starting at the 0-0 band was analyzed with the aid of CIS/6-31+G(D) calculations, from which the torsional potential function in the S 1 state was derived to be V(φ)=V 2(1− cos 2φ)/2+V 4(1− cos 4φ)/2 , where V 4=−281±7 cm −1, using V 2=96 cm −1 derived from ab initio calculations.
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