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Photoionization efficiency spectrum and ionization energy of HSO studied by discharge flow-photoionization mass spectrometry
Journal of Chemical Physics
The photoionization efficiency ͑PIE͒ spectrum of HSO was measured in the spectral range ͑107-130͒ nm by means of a discharge flow and a photoionization mass spectrometer coupled to a synchrotron as the radiation source. HSO radicals were generated by reacting O atoms with various organothiol compounds, C 2 H 5 SH, 2-C 3 H 7 SH, or HSC 2 H 4 SH, in the flow tube. The ionization energy of HSO was determined for the first time and found to be ͑9.918Ϯ0.016͒ eV. GAUSSIAN-2 calculations predict 9.897doi:10.1063/1.473835 fatcat:qlxdnlyl7fesvbwmm5gxi2kzra