Low and intermediate energy electron collisions with the C - 2 molecular anion
Low and intermediate energy electron collisions with the C - 2 molecular anion
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低能和中能电子与C-2分子阴离子的碰撞
DOI：
10.1088/0953-4075/41/15/155201
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
Halmová G
中科院分区：
文献类型：
--
作者：
Halmová G
用分子赝态R矩阵(MRMPS)方法计算了碳二聚体阴离子的电子碰撞电子脱离和电子激发。在C-−-2的电离阈值以上，发现了具有1Σ+g、1Πg和3Πg对称性的共振。这些是被吸引的极化势与排斥的库仑相互作用竞争的效应所捕获的形状共振。Πg共振谱在剥离截面上给出了类似于实验观察到的结构。激发截面和脱离截面都被大碰撞参数的碰撞所支配，碰撞的贡献用Born近似来模拟。
Calculations are presented which use the molecular R-matrix with pseudo-states (MRMPS) method to treat electron impact electron detachment and electronic excitation of the carbon dimer anion. Resonances are found above the ionization threshold of C− 2 with 1 Σ+ g, 1 Π g and 3 Π g symmetry. These are shape resonances trapped by the effect of an attractive polarization potential competing with a repulsive Coulomb interaction. The Π g resonances are found to give structure in the detachment cross section similar to that observed experimentally. Both excitation and detachment cross sections are found to be dominated by large impact parameter collisions whose contribution is modelled using the Born approximation.