Lifetimes and Quantum Yields of Individual Vibronic States of C6D6 and C6H5F

Abstract

The lifetimes and quantum yields of fluorescence from 22 vibronic states of C₆D₆ and 59 vibronic states of C₆H₅F have been determined under ``free molecule'' conditions. It is found that the dependence of non‐radiative lifetime on number of quanta of excess vibrational energy follows a pattern similar to that observed for C₆H₆. Calculations of the energy dependence of τ_nr by Heller, Freed, and Gelbart are in good agreement with the observations. An ancillary consequence of the study of the lifetimes of vibronic states of C₆H₅F is the suggested reassignment of five transitions.