四氯化碳同步辐射光电离的研究:离子生成焓与键能的测定

Photoionization Studies of CCl_4 Using Synchrotron Radiation: The Measurements of Ionic Formation Enthalpies and Bond Energies

采用VUV同步辐射光源,在超声冷却条件下研究了四氯化碳(CCl_4)光电离的动力学过程.实验表明,母体离子极不稳定.本文通过对CCl_4光解离电离碎片出现势(AP)的测定,结合有关确认的热力学数据,估算了该体系中有关离子的标准生成焓、离子型分子及自由基中的键能、中性分子及自由基中的键能和母体离子的解离能等一系列热化学数据.详细探讨了CCl_4及VUV光解离电离的通道及其它可能发生的动力学过程.

The photoionization and photodissociative ionization processes of CCl4 have been investigated under the supersonic beam conditions using synchrotron radiation. The experimental results show that the parent ion is extremely unstable. Based on the measured appearance potential (AP) of the ionic fragments from the photodissociation ionization of CCl4, the related ionic formation enthalpies, the bond dissociation energies (BDE) of ionic and neutral species,the dissociation energies (DE) of parent ion have been evaluated. The most possible channels of dissociative photoionization and other probably kinetic processes have been analyzed.