Ra. Brownsword et al., PHOTODISSOCIATION DYNAMICS OF CHF2CL AFTER PHOTOEXCITATION AT THE LYMAN-ALPHA WAVELENGTH (121.6 NM), The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory, 101(6), 1997, pp. 995-999
The collision-free gas-phase photodissociation dynamics of CHF2Cl (HCF
C-22) were studied at room temperature using the laser photolysis/lase
r-induced fluorescence ''pump/probe'' technique. Lyman-or laser radiat
ion (lambda = 121.6 nm) was used both to photodissociate the parent mo
lecule and to detect the nascent H atom products via (2p(2)P <-- 1s(2)
S) laser-induced fluorescence. An absolute H atom quantum yield of Phi
(H) = 0.77 +/- 0.13 was determined by a calibration method in which H2
O photolysis at 121.6 nm was used as a reference source of well-define
d H atom concentrations. The line shapes of the measured H atom Dopple
r profiles indicate a bimodal velocity distribution suggesting the pre
sence of two different H atom formation pathways in the Lyman-a photod
issociation of CHF2Cl.