Vibrational excitation of ground-state p-difluorobenzene in collisions with He

Abstract

Crossed molecular beam experiments on state‐resolved vibrational excitation of S₀ p‐difluorobenzene show only v=0→1,2 excitation of mode 30, the in‐phase bend of the fluorine atoms perpendicular to the benzene plane. This high degree of mode 30 selectivity in transitions from the rotationally cold vibrational ground state suggests that efficient and mode‐specific transfer of vibrational energy in collisions of polyatomic molecules need not depend strongly on intramolecular level mixing.