title: Computational studies on metathetical and redox processes of HOCl in the gas phase. 1. Reactions with H, O, HO, and HO2.
abstract: The potential energy surfaces of four reactions including (a) HOCl + H, (b) HOCl + O, (c) HOCl + HO, (d) HOCl + HO(2), have been studied by the CCSD(T)/aug-cc-pVTZ//CCSD/aug-cc-pVDZ, CCSD(T)/aug-cc-pVTZ//CCSD/cc-pVDZ, and CCSD(T)/6-311+G(3df,2p)//BH&HLYP/6-311+G(3df,2p) levels of theory. For both HOCl + H and HOCl + O, the direct Cl-abstraction channels take place via the lowest energy barriers; for both HOCl + HO and HOCl + HO(2), the lowest energy barrier channels are the indirect H-abstraction reactions by HO(x) (x = 1, 2) via long-lived reaction intermediates. The rate constants for the low barrier channels have been calculated in the temperature range 200-3000 K by statistical theory. The predicted rate constants for HOCl + H and HOCl + HO are in good agreement with experimental results whereas that for HOCl + O was found to be in disagreement with the majority of available experimental data, suggesting a need for further improvement in theory and/or experiment.
authors: Department of Chemistry, Emory University, Atlanta, Georgia 30322, USA.
authors: Z F
authors: ZF
authors: Xu
authors: M C
authors: MC
authors: Lin