CH3I同步辐射光电离及生成焓、键能和质子亲合势的测定

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。

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

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 CH^l have been accurately determined. The standard formation enthalpies of the ions, bond energies DO 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.