Sa. Kandel et al., DYNAMICS FOR THE CL-]HCL+C2H5 REACTION EXAMINED THROUGH STATE-SPECIFIC ANGULAR-DISTRIBUTIONS(C2H6), The Journal of chemical physics, 105(17), 1996, pp. 7550-7559
Photolysis of Cl-2 initiates the title reaction at a sharply defined c
ollision energy of 0.24+/-0.03 eV. Nascent product rotational state di
stributions for HCl (v=0) are determined using resonance enhanced mult
iphoton ionization (REMPI), center-of-mass scattering distributions ar
e measured by the core-extraction technique, and the average internal
energy of the C2H5 product is deduced from the dependence of the core-
extracted signal on the photolysis polarization. The HCl product has l
ittle rotational excitation, but the scattering distribution is nearly
isotropic. Although seemingly contradictory, both of these features c
an be accounted for by using the simple line-of-centers model presente
d to explain earlier results for the Cl+CH4 reaction. in contrast to t
he Cl+CH4 reaction, the data suggest that the Cl+C2H6 reaction proceed
s through a loosely constrained transition-state geometry. The reactio
ns of atomic chlorine with ethane, C2H6, and perdeuteroethane, C2D6, y
ield virtually identical results. These findings, along with the low e
nergy deposited by the reaction into the ethyl product (200+/-120 cm(-
1)), demonstrate that the alkyl fragment acts largely as a spectator i
n this hydrogen abstraction reaction. (C) 1996 American Institute of P
hysics.