Photoionization spectrum and ionization energy of CH3SCl

Bing Ming Cheng*, Eh Piew Chew, Chin Ping Liu, Jen-Shiang Yu, Chin Hui Yu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Photoionization-efficiency (PIE) spectra in the wavelength range 108-144 nm were measured for CH3SCl generated from the reaction system Cl/Cl2/CH3SH(CH3SSCH3) in a discharge-flow reactor coupled to a photoionization mass spectrometer employing a synchrotron as the source of radiation. According to the PIE spectrum of CH3SCl thus obtained, the ionization energy (IE) is (9.147±0.007) eV. Based on GAUSSIAN-2 calculations, the observed ionization of CH3SCl near the threshold region is likely to form from singlet CH3SCl to doublet CH3SCl+; the calculated IE 9.140 eV agrees well with the experimental value. Two vibrational frequencies of singlet CH3SCl and one of doublet CH3SCl+ were found to be (244±60) cm-1, (513±60) cm-1, and (631±60) cm-1, respectively.

Original languageEnglish
Pages (from-to)4757-4762
Number of pages6
JournalJournal of Chemical Physics
Issue number10
StatePublished - 8 Mar 1999

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