Single and double electron-impact ionization of chlorine dioxide

被引:14
作者
O'Connor, CSS [1 ]
Tafadar, N [1 ]
Price, SD [1 ]
机构
[1] Univ London Univ Coll, Christopher Ingold Labs, Dept Chem, London WC1H 0AJ, England
来源
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1998年 / 94卷 / 13期
关键词
D O I
10.1039/a801529e
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
Electron-impact single and double ionization of chlorine dioxide; OClO, have been investigated using time-of-flight mass spectrometry and ion-ion coincidence techniques. Relative partial single ionization cross sections of OClO have been determined for incident electron energies from 30 to 450 eV using time-of-flight mass spectrometry. The experiments detect stable parent ions, OClO+, and the fragmentation products O+, O-2(+), Cl+ and ClO+. The formation and fragmentation of the OClO dication has been investigated using ion-ion coincidence techniques coupled with time-of-flight mass spectrometry. The coincidence spectra show that OClO2+ dissociates to form the following pairs of ions: O+ + ClO+ and O+ + Cl+. Interpretation of the coincidence spectra suggests that there is a multiple kinetic energy release upon dicationic dissociation to form the O+ + Cl+ ion pair, and also yields a determination of the excitation energy required to form the lowest energy dication electronic states which dissociate to form O+ + ClO+ and O+ + Cl+. The similarity of these excitation energies indicate that these dissociation reactions might occur from the same electronic state of OClO2+. Comparison of these excitation energies with estimated values of the double ionization energy of OClO indicate that this state is probably the ground electronic state of OClO2+ and, hence, these investigations provide a first estimate for the double ionization energy of OClO.
引用
收藏
页码:1797 / 1803
页数:7
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