Model-potential calculations of positron binding, scattering, and annihilation for atoms and small molecules using a Gaussian basis

Model-potential calculations of positron binding, scattering, and annihilation for atoms and small molecules using a Gaussian basis
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使用高斯基计算原子和小分子的正电子结合、散射和湮灭的模型势

DOI:
10.1103/physreva.101.022702
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发表时间:
2020
期刊:
影响因子:
2.9
通讯作者:
Swann A
Swann A
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Swann A

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用模型势方法计算了Be、Mg、He、Ar、Ar和Be等多个原子和非极性小分子的正电子束缚、弹性散射和湮灭。对于靶内的每种原子,模型势都包含一个自由参数。选择它的值是为了再现存在的从头电子-原子结合能或散射相移。计算是用正电子态的高斯基进行的,我们展示了如何从离散的正能量赝态获得散射相移和归一化湮灭率的值。目前的结果与现有的计算和实验数据符合得很好,包括低位虚正电子态强烈增强的值。一个例外是室温下的For,它的现值比50多年前的实验值要小得多。我们的计算预测,在所研究的分子靶中,只有可能支持正电子的束缚态,其结合能为几meV。
A model-potential method is employed to calculate binding, elastic scattering, and annihilation of positrons for a number of atoms and small nonpolar molecules, namely, Be, Mg, He, Ar,, and. The model potential contains one free parameter for each type of atom within the target. Its values are chosen to reproduce existingab initiopositron-atom binding energies or scattering phase shifts. The calculations are performed using a Gaussian basis for the positron states, and we show how to obtain values of the scattering phase shifts and normalized annihilation ratefrom discrete positive-energy pseudostates. Good agreement between the present results and existing calculations and experimental data, where available, is obtained, including thevalue for, which is strongly enhanced by a low-lying virtual positron state. An exception is the room-temperature value offor, for which the present value is much smaller than the experimental value obtained over 50 years ago. Our calculations predict that among the molecular targets studied, onlymight support a bound state for the positron, with a binding energy of a few meV.
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