Dipole Moment of the First Excitedpgr;*thinsp;larr;thinsp;pgr;State of Fluorobenzene

摘要

A Stark effect is observed in the rotational fine structure of the 0ndash;0 band of the lowesthyphen;lying singletpgr;*thinsp;larr;thinsp;pgr;state of fluorobenzene. Splittings are found in bothPandRbranches. This enables us to determine the excitedhyphen;state dipole moment to bemgr;prime;thinsp;equals;thinsp;1.96thinsp;plusmn;thinsp;0.07D. This result is discussed in relation to previous measurements on substituted benzenes, and it is shown that the previously observed correlation between structure and dipole moment for excited states also extends to fluorobenzene.