CO2 laser-induced photolysis of spirohexane: Time resolved observation of vibrationally excited 1,3-butadiene
作者:P.K. Chowdhury、R.K. Vatsa、Awadhesh Kumar、K.V.S.Rama Rao、J.P. Mittal
DOI:10.1016/0584-8539(92)80242-o
日期:1992.11
Vibrationally excited spirohexane (SHX) generated in CO2 laser irradiation undergoes photolysis producing ethylene, 1,3-butadiene and a C4 compound as major products. Collisional energy pooling plays a major role in the multiphoton excitation process. Time-resolved formation of 1,3-butadiene is monitored by UV absorption from which the unimolecular rate constant for SHX dissociation is found to be 5.6 x 10(5) s-1. A red shift of 40 nm observed in the transient UV absorption spectrum has been assigned to nascent 1,3-butadiene, which suggests that vibrationally hot 1,3-butadiene molecules are formed. The effects of laser energy fluence and pressure of SF6 as a sensitizer on dissociation yield are also investigated.