Photoionization studies of sulfur radicals and products of their reactions

Bing Ming Cheng*, Eh Piew Chew, Wen Ching Hung, Jürg Eberhard, Yuan-Pern Lee

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


A discharge flow-photoionization mass spectrometric system coupled to a synchrotron is employed to study intermediates and products of sulfur radical reactions related to atmospheric chemistry. Sulfur radicals are generated from reactions of oxygen or chlorine atoms with sulfur compounds in a flow tube. The gaseous reaction products are sampled into the ionization region via a three-stage differential pumping scheme. Photoionization spectra and ionization energies are measured by dispersing synchrotron radiation to ionize the samples. Using this technique, photoionization spectra and ionization energies of HSO, CH3SO, C2H5SO, HSCl, and some secondary reaction products, SSCl, HSSCl, HSSSH, CH3SOH and CH3SS(O)CH3, were measured for the first time.

Original languageEnglish
Pages (from-to)1041-1043
Number of pages3
JournalJournal of Synchrotron Radiation
Issue number3
StatePublished - 1 May 1998


  • Ionization energy
  • Photoionization mass spectrometry
  • Photoionization spectra
  • Sulfur radicals

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