Photoionization efficiency spectrum and ionization energy of HSO studied by discharge flow photoionization mass spectrometry

被引：15

作者：

Cheng, BM ^{[1
]}

Eberhard, J ^{[1
]}

Chen, WC ^{[1
]}

Yu, CH ^{[1
]}

机构：

[1] NATL TSING HUA UNIV, DEPT CHEM, HSINCHU 30043, TAIWAN

来源：

JOURNAL OF CHEMICAL PHYSICS | 1997年 / 106卷 / 23期

关键词：

D O I：

10.1063/1.473835

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The photoionization efficiency (PIE) spectrum of HSO was measured in the spectral range (107-130) 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, C2H5SH, 2-C3H7SH, or HSC2H4SH, in the flow tube. The ionization energy of HSO was determined for the first time and found to be (9.918 +/- 0.016) eV. GAUSSIAN-2 calculations predict 9.897 eV for ionization to HSO+, the singlet ground state of the molecular ion, in satisfactory agreement with the experimental result. The onset to tripler HSO+ may occur at (11.15 +/- 0.04) eV. A vibrational frequency of HSO+ of (1150 +/- 160) cm(-1) was derived from the separation of steps in the PIE spectrum. The heat of formation of HSQ(+) was also derived and calculated to be Delta(f)H(298)degrees(HSO+) = (228 +/- 5) kcal mol(-1). (C) 1997 American Institute of Physics.

引用

页码：9727 / 9733

页数：7

共 43 条

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