Vibrational Relaxation of Highly Excited Toluene.

BEATRIZ M. TOSELLI; J. D. BRENNER, M. L.YERRAM, W. E. CHIN, K. D. KING AND ; JOHN R. BARKER

AMER INST PHYSICS

Año: 1991 p. 176 - 176

he collisional loss of vibrational energy from gas-phase toluene, pumped by a pulsed KrFlaser operating at 248 nm, has been observed by monitoring the time-resolved infraredfluorescence from the C-H stretch modes near 3.3 p,m. The fragmentation quantum yield oftoluene pumped at 248 nm was determined experimentally to be -6%. Energy transfer datawere obtained for 20 collider gases, including unexcited toluene, and analyzed by an improvedinversion technique that converts the fluorescence intensity to the bulk average energy, fromwhich is extracted «!:..E», the bulk average amount of energy transferred per collision.Comparisons are presented of these results with similar studies of benzene and azulene, andwith the time-resolved ultraviolet absorption study of toluene carried out by Hippler et al. [J.Chern. Phys. 78, 6709 (1983)]. The present results show ( (!:..E » to be nearly directlyproportional to the vibrational energy of t