Vacuum ultraviolet photodissociation and photoionization studies of CH3SH and SH
10.1063/1.461103
Crossref journal-article
AIP Publishing
The Journal of Chemical Physics (317)
Abstract

The kinetic energy releases of the photodissociation processes, CH3SH+hν (193 nm)→CH3+SH, CH3S+H, and CH2S+H2, have been measured using the time-of-flight mass spectrometric method. These measurements allow the direct determination of the dissociation energies for the CH3–SH and CH3S–H bonds at 0 K as 72.4±1.5 and 90±2 kcal/mol, respectively. The further dissociation of SH according to the process SH+hν (193 nm)→S+H has also been observed. The appearance energy (AE) of S produced in the latter process is consistent with the formation of S(3P)+H. The photoelectron–photoion coincidence (PEPICO) spectra for CH3SH+, CH3S+ (or CH2SH+), and CH2S+ from CH3SH have been measured in the wavelength range of 925–1460 Å. The PEPICO measurements make possible the construction of the breakdown diagram for the unimolecular decomposition of internal-energy-selected CH3SH+ in the range of 0–83 kcal/mol. The AE measured for CH2S+ is consistent with the conclusion that the activation energy is negligible for 1,2-H2 elimination from CH3SH+.

Bibliography

Nourbakhsh, S., Norwood, K., Yin, H.-M., Liao, C.-L., & Ng, C. Y. (1991). Vacuum ultraviolet photodissociation and photoionization studies of CH3SH and SH. The Journal of Chemical Physics, 95(2), 946–954.

Authors 5
  1. S. Nourbakhsh (first)
  2. K. Norwood (additional)
  3. H.-M. Yin (additional)
  4. C.-L. Liao (additional)
  5. C. Y. Ng (additional)
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Dates
Type When
Created 23 years, 1 month ago (July 26, 2002, 8:32 a.m.)
Deposited 1 year, 6 months ago (Feb. 10, 2024, 8:01 a.m.)
Indexed 10 hours, 13 minutes ago (Aug. 30, 2025, 1:18 p.m.)
Issued 34 years, 1 month ago (July 15, 1991)
Published 34 years, 1 month ago (July 15, 1991)
Published Print 34 years, 1 month ago (July 15, 1991)
Funders 0

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@article{Nourbakhsh_1991, title={Vacuum ultraviolet photodissociation and photoionization studies of CH3SH and SH}, volume={95}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.461103}, DOI={10.1063/1.461103}, number={2}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Nourbakhsh, S. and Norwood, K. and Yin, H.-M. and Liao, C.-L. and Ng, C. Y.}, year={1991}, month=jul, pages={946–954} }