Calculation of photodetachment cross sections and photoelectron angular distributions of negative ions using density functional theory.

Calculation of photodetachment cross sections and photoelectron angular distributions of negative ions using density functional theory.
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DOI:
10.1063/1.4932978
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发表时间:
2015-10
期刊:
The Journal of chemical physics
影响因子:
--
通讯作者:
Yuan Liu;C. Ning
Yuan Liu;C. Ning
中科院分区:
其他
文献类型:
--
作者:
Yuan Liu;C. Ning

文献摘要

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近年来,光电子速度图成像的发展使得通过实验获得光电子角分布(PAD)变得更加容易。然而,在大多数情况下,PAD 的解释只是定性的,关于如何计算阴离子 PAD 的工作报道非常有限。在目前的工作中,我们报告了一种使用密度泛函理论 Kohn-Sham 轨道来计算光脱离截面和各向异性参数 β 的方法。通过分析计算所有随机分子取向的球形平均值。已经编写了一个可以处理高斯型轨道和斯莱特型轨道的程序。对Li(-)、C(-)、O(-)、F(-)、CH(-)、OH(-)、NH2(-)、O2(-)和S2(-)的测试计算表明,我们的方法是计算阴离子光脱离截面和各向异性参数β的有效方法,因此在大型系统中具有应用前景。
Recently, the development of photoelectron velocity map imaging makes it much easier to obtain the photoelectron angular distributions (PADs) experimentally. However, explanations of PADs are only qualitative in most cases, and very limited works have been reported on how to calculate PAD of anions. In the present work, we report a method using the density-functional-theory Kohn-Sham orbitals to calculate the photodetachment cross sections and the anisotropy parameter β. The spherical average over all random molecular orientation is calculated analytically. A program which can handle both the Gaussian type orbital and the Slater type orbital has been coded. The testing calculations on Li(-), C(-), O(-), F(-), CH(-), OH(-), NH2 (-), O2 (-), and S2 (-) show that our method is an efficient way to calculate the photodetachment cross section and anisotropy parameter β for anions, thus promising for large systems.