Experimental and Computational Studies of the Kinetics of the Reaction of Atomic Hydrogen with Methanethiol

Katherine E Kerr; Ionut M Alecu; Kristopher M Thompson; Yide Gao; Paul Marshall

doi:10.1021/jp512966a

Experimental and Computational Studies of the Kinetics of the Reaction of Atomic Hydrogen with Methanethiol

J Phys Chem A. 2015 Jul 16;119(28):7352-60. doi: 10.1021/jp512966a. Epub 2015 Apr 23.

Authors

Katherine E Kerr¹, Ionut M Alecu¹, Kristopher M Thompson¹, Yide Gao¹, Paul Marshall¹

Affiliation

¹ Department of Chemistry and Center for Advanced Scientific Computing and Modeling, University of North Texas, 1155 Union Circle #305070, Denton, Texas 76203-5017, United States.

PMID: 25872011
DOI: 10.1021/jp512966a

Abstract

The overall rate constant for H + CH3SH has been studied over 296-1007 K in an Ar bath gas using the laser flash photolysis method at 193 nm. H atoms were generated from CH3SH and in some cases NH3. They were detected via time-resolved resonance fluorescence. The results are summarized as k = (3.45 ± 0.19) × 10(-11) cm(3) molecule(-1) s(-1) exp(-6.92 ± 0.16 kJ mol(-1)/RT) where the errors in the Arrhenius parameters are the statistical uncertainties at the 2σ level. Overall error limits of ±9% for k are proposed. In the overlapping temperature range there is very good agreement with the resonance fluorescence measurements of Wine et al. Ab initio data and transition state theory yield moderate accord with the total rate constant, but not with prior mass spectrometry measurements of the main product channels leading to CH3S + H2 and CH3 + H2S by Amano et al.