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]

---

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), Journal Name: Journal of Chemical Physics; (United States) Vol. 95:7; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

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