Photoionization-efficiency spectrum and ionization energy of C2H5SCl

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

3 Scopus citations


Photoionization-efficiency (PIE) spectra in the wavelength range of 108-143 nm are measured for C2H5SCl produced from reaction systems Cl/Cl2/C2H5SH and Cl/Cl2/C2H5SSC2H5 in a discharge-flow reactor coupled to a photoionization mass spectrometer employing a synchrotron as the source of radiation. According to PIE spectra of C2H5SCl thus obtained, the ionization energy (IE) is (8.994±0.007) eV. Based on GAUSSIAN-2 calculations, the observed ionization of C2H5SCl near the threshold region is likely to form doublet C2H5SCl+ from singlet C2H5SCl: the calculated IE 8.978 eV agrees well with the experimental value. A vibrational frequency of doublet C2H5SCl+, was found to be (557±60) cm-1, which agrees satisfactorily with a theoretical value of 560.9 cm-1.

Original languageEnglish
Pages (from-to)10093-10098
Number of pages6
JournalJournal of Chemical Physics
Issue number22
StatePublished - 8 Dec 1999

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