Journal of Physical Chemistry, Vol.100, No.32, 13375-13380, 1996
Photodissociation of Chf2Cl at 193 nm - H/Cl and Cl(P-2(1/2))/Cl(P-2(3/2)) Branching Ratios
The photodissociation of chlorodifluoromethane, CHF2Cl(HCFC-22), was studied by a laser pump-and-probe technique, using 193 nm excitation of the parent molecule and a time-of-flight mass spectrometer combined with (2+1) resonance-enhanced multiphoton ionization to detect products. Photolysis via two channels, C-Cl and C-H bond rupture, was observed, while HCl elimination was not found. The H, Cl(P-2(3/2)) and Cl(P-2(1/2)) yields are found to be first order in the photolysis and third order in the probe laser intensity. The H/Cl and Cl(P-2(1/2))/Cl(P-2(3/2)) branching ratios are 0.19+/-0.06 and 0.36+/-0.03, respectively. The mechanism of the dissociation is discussed in view of these results.
Keywords:ULTRAVIOLET PHOTODISSOCIATION;HYDROGEN-CHLORIDE;DOPPLER PROFILES;CROSS-SECTIONS;HCL;DISTRIBUTIONS;REGION;ATOMS;CHLOROETHYLENES;PHOTOFRAGMENTS