化学学报 ›› 1998, Vol. 56 ›› Issue (5): 459-464. 上一篇    下一篇

研究论文

CH3I同步辐射光电离及生成焓、键能和质子亲合势的测定

冉琴;裴林森;束继年;陈从香;俞书勤;马兴孝;武国华;盛六四;张允武   

  1. 中国科学技术大学化学物理系;中国科学技术大学国家同步辐射实验室
  • 发布日期:1998-05-15

Photoionization of CH3I and determination of formation enthalpies, bond energies and proton affinities using synchrotron radiation

RAN QIN;PEI LINSEN;SHU JINIAN;CHEN CONGXIANG;YU SHUQIN;MA XINGXIAO;WU GUOHUA;SHENG LIUSI;ZHANG YUNWU   

  • Published:1998-05-15

在超声射流冷却条件下用VUV同步辐射研究了CH3I分子的光电离过程。测定了CH3I光电离及解离电离产生的CH3I^+, CH3^+和I^+的出现势, 结合已确认的热力学数据, 估算出体系中有关离子的标准生成焓、分子和分子离子的键能、自由基的质子亲合势及母体离子的解离能等数据。对CH3I分子VUV光解离电离通道进行了分析。

关键词: 碘甲烷, 光电离, 同步辐射, 出现势

The photoionization and photodissociative ionization of CH3I have been investigated under the supersonic beam conditions by using synchrotron radiation. The appearance potentials (AP) of the ionic fragments from CH3I have been accurately determined. The standard formation enthalpies of the ions, bond energies D0 of the molecules or molecule ions, proton affinities PA0 of the radicals, and the dissociation energy De of parent ion have been evaluated. The most possible channels of VUV dissociation photoionization have been analyzed.

Key words: IODOMETHANE, PHOTOIONIZATION, SYNCHRONOUS RADIATION

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