摘要:
本文利用反应显微成像技术（reaction microscope）研究了54eV电子入射甲烷分子导致的电离解离过程,详细分析了电离解离产生的CH2＋,CH＋,C＋离子碎片的动能分布情况.实验结果表明,该入射能量下产生CH2＋,CH＋,C＋离子碎片主要贡献来自2a1内价轨道电子的直接电离过程产生的离子态（2a1）-1和1t2外价轨道电子的电离加激发过程产生的离子态（1t2）-2（3a1）的解离,离子的动能与产生这些碎片离子的初始能态有很强的依赖关系.其中小于0.1eV的低能离子碎片主要来源于（2a1）-1态的解离,同时（1t2）-2（3a1）态也有贡献;动能在0.1到0.3eV之间的离子,两种能态的贡献相当;而动能大于0.4eV的离子碎片几乎全部来源于（1t2）-2（3a1）态.
Abstract:
The dissociative ionization process of methane induced by 54eV electron impact is investigated using an advanced reaction microscope. In the present paper, our attention is specially paid to the kinetic energy distributions of the CH＋2,CH＋ and C＋ fragments. Energy deposition spectra are presented for these fragments of different kinetic energies. It is shown that the dissociations from the （2a1） -1 and （1t2） -2（3a1） states of CH＋4 are the dominant contributions of the CH＋2, CH＋ and C＋ fragments. The kinetic energy of fragment is sensitive to the electronic state of its parent ion. Fragment ions with kinetic energies lower than 0.1 eV are mainly from the dissociation of （2a1） -1 state, and partly from the dissociation of （1t2） -2（3a1） state; the ions with energies between 0.1 eV and 0.3 eV are contrituted equally by the two states; the ions with energies higher than 0.4 eV are formed dominantly from the dissociation of （1t2） -2（3a1） state.
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