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
影响因子:
2.9
通讯作者:
Swann A
中科院分区:
文献类型:
--
作者:
Swann A
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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DOI:
--
发表时间:
2012
期刊:
影响因子:
--
作者:
C. Surko;J. Danielson;G. Gribakin;R. Continetti
通讯作者:
R. Continetti
DOI:
--
发表时间:
2008
期刊:
影响因子:
--
作者:
J. N. Cooper;E. Armour;M. Plummer
通讯作者:
M. Plummer
DOI:
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发表时间:
1983
期刊:
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--
作者:
A. Jain;D. Thompson
通讯作者:
D. Thompson
DOI:
--
发表时间:
1993
期刊:
Physical Review A. Atomic, Molecular, and Optical Physics
影响因子:
--
作者:
I. Bray;A. Stelbovics
通讯作者:
A. Stelbovics
影响因子:
8.6
作者:
J. Young;C. Surko
通讯作者:
C. Surko