Molecular dissociation by electron impact: High Rydberg fragments from methane, ethylene, and ethane
Molecular dissociation by electron impact: High Rydberg fragments from methane, ethylene, and ethane
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电子碰撞引起的分子解离：来自甲烷、乙烯和乙烷的高里德伯碎片
DOI：
10.1063/1.434838
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发表时间：
1977
影响因子：
4.4
通讯作者：
R. Freund
中科院分区：
文献类型：
--
作者：
J. Schiavone;David E. Donohue;R. Freund
CH4、C2H4和C2H6的电子冲击离解产生高里德堡H和C碎片。飞行时间测量和激励函数有助于表征所涉及的分子过程。虽然细节不同，但这三种分子表现出相似的解离行为；相对低动能碎片（约8 eV）来自19至30 eV之间的状态，高动能碎片来自30至40 eV之间的状态（最可能有双电离核的状态），甚至更高动能碎片（高达18 eV）来自40 eV以上的状态。高里德伯动能谱与可用离子动能谱的比较结果基本一致，证实了核离子模型在多原子分子中的实用性。
Electron impact dissociation of CH4, C2H4, and C2H6 produces high Rydberg H and C fragments. Time‐of‐flight measurements and excitation functions help to characterize the molecular processes involved. Although details differ, the three molecules display similar dissociation behavior; relatively low kinetic energy fragments (≲8 eV) arise from states between 19 and 30 eV, higher kinetic energy fragments from states between 30 and 40 eV (states most likely with doubly ionized cores), and even higher kinetic energy fragments (up to 18 eV) from states above 40 eV. Comparisons of high Rydberg kinetic energy spectra with available ion kinetic energy spectra show general agreement confirming the utility of the core ion model for polyatomic molecules.