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首页> 外文期刊>The Journal of Chemical Physics >Calculation of photodetachment cross sections and photoelectron angular distributions of negative ions using density functional theory
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Calculation of photodetachment cross sections and photoelectron angular distributions of negative ions using density functional theory

机译:利用密度泛函理论计算负离子的光解截面和光电子角分布

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摘要

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 beta. 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-, O-2(-), and S-2(-) show that our method is an efficient way to calculate the photodetachment cross section and anisotropy parameter beta for anions, thus promising for large systems. (C) 2015 AIP Publishing LLC.
机译:近来,光电子速度图成像的发展使得更容易通过实验获得光电子角分布(PAD)。但是,在大多数情况下,对PAD的解释只是定性的,而且关于如何计算阴离子的PAD的报道非常有限。在目前的工作中,我们报告了一种使用密度泛函理论的Kohn-Sham轨道计算光分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上的球均值。已经编写了既可以处理高斯型轨道又可以处理斯拉特型轨道的程序。对Li-,C-,O-,F-,CH-,OH-,NH2-,O-2(-)和S-2(-)的测试计算表明,我们的方法是一种计算阴离子的光电离截面和各向异性参数β,因此有望用于大型系统。 (C)2015 AIP Publishing LLC。

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