Rate Coefficients of the Reactions of Fluorine Atoms with H
2S and SH over the Temperature Range 220-960 K.
MOLECULES (BASEL, SWITZERLAND) 2022;
27:molecules27238365. [PMID:
36500456 PMCID:
PMC9739569 DOI:
10.3390/molecules27238365]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Revised: 11/24/2022] [Accepted: 11/24/2022] [Indexed: 12/05/2022]
Abstract
Reaction F + H2S→SH + HF (1) is an effective source of SH radicals and an important intermediate in atmospheric and combustion chemistry. We employed a discharge-flow, modulated molecular beam mass spectrometry technique to determine the rate coefficient of this reaction and that of the secondary one, F + SH→S + HF (2), at a total pressure of 2 Torr and in a wide temperature range 220-960 K. The rate coefficient of Reaction (1) was determined directly by monitoring consumption of F atoms under pseudo-first-order conditions in an excess of H2S. The rate coefficient of Reaction (2) was determined via monitoring the maximum concentration of the product of Reaction (1), SH radical, as a function of [H2S]. Both rate coefficients were found to be virtually independent of temperature in the entire temperature range of the study: k1 = (1.86 ± 0.28) × 10-10 and k2 = (2.0 ± 0.40) × 10-10 cm3 molecule-1 s-1. The kinetic data from the present study are compared with previous room temperature measurements.
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