Vacuum ultraviolet photodissociation and photoionization studies of CH sub 3 SCH sub 3 and CH sub 3 S

Journal Article · Tue Oct 01 00:00:00 EDT 1991 · Journal of Chemical Physics; (United States)

DOI:https://doi.org/10.1063/1.461717· OSTI ID:5180242

Nourbakhsh, S; Norwood, K; Yin, H; Liao, C; Ng, C Y ^[1]

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1. Ames Laboratory, U.S. Department of Energy, and Department of Chemistry, Iowa State University, Ames, Iowa (USA)

We have measured the translational energy releases of the laser photodissociation processes CH{sub 3}SCH{sub 3}+{ital h}{nu} (193 nm){r arrow}CH{sub 3}+CH{sub 3}S (process (1)) and CH{sub 3}SCH{sub 2}+H (process (2)); and CH{sub 3}S+{ital h}{nu} (193 nm){r arrow}S+CH{sub 3} (process (3)). The onsets of the translational energy distributions for photofragments of processes (1) and (2) allow the direct determination of 74.9{plus minus}1.5 and 91{plus minus}2.5 kcal/mol for the dissociation energies of the CH{sub 3}--SCH{sub 3} and H--CH{sub 2}SCH{sub 3} bonds at 0 K, respectively. The threshold observed for S formed by process (3) is consistent with the conclusion that the production of S({sup 3}{ital P}) is small compared to S({sup 1}{ital D}). The photoelectron--photoion coincidence (PEPICO) spectra for CH{sub 3}SCH{sup +}{sub 3}, CH{sub 3}SCH{sup +}{sub 2}, CH{sub 3}S{sup +} (or CH{sub 2}SH{sup +} ), and CH{sub 2}S{sup +} resulting from photoionization of CH{sub 3}SCH{sub 3} have been measured in the wavelength region of 900--1475 A. The PEPICO study allows the construction of a detailed breakdown diagram for the formation of CH{sub 3}SCH{sup +}{sub 2}, CH{sub 3}S{sup +} (or CH{sub 2}SH{sup +} ), and CH{sub 2}S{sup +} from energy-selected CH{sub 3}SCH{sup +}{sub 3} ions.

• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5180242
• Journal Information: Journal of Chemical Physics; (United States), Vol. 95:7; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ORGANIC SULFUR COMPOUNDS
PHOTOLYSIS
DISSOCIATION
FAR ULTRAVIOLET RADIATION
LASER RADIATION
PHOTOIONIZATION
PHOTON-MOLECULE COLLISIONS
TIME-OF-FLIGHT METHOD
CHEMICAL REACTIONS
COLLISIONS
DECOMPOSITION
ELECTROMAGNETIC RADIATION
IONIZATION
MOLECULE COLLISIONS
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTON COLLISIONS
RADIATIONS
ULTRAVIOLET RADIATION
640302* - Atomic
Molecular & Chemical Physics- Atomic & Molecular Properties & Theory