Semiempirical models for low energy positron scattering by Ar, Kr and Xe

被引：15

作者：

Arretche, Felipe ^{[1
]}

Barp, Marcos, V ^{[1
]}

Scheidt, Adolfo ^{[1
]}

Seidel, Eliton Popovicz ^{[1
]}

Tenfen, Wagner ^{[2
]}

机构：

[1] Univ Fed Santa Catarina, Dept Fis, BR-88040900 Florianopolis, SC, Brazil

[2] Univ Fed Fronteira Sul, Dept Fis, BR-85770000 Realeza, Parana, Brazil

来源：

JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS | 2019年 / 52卷 / 21期

关键词：

positron scattering; scattering length; semiempirical model; folded differential cross sections; hyperpolarisabilities; TOTAL CROSS-SECTIONS; POLARIZATION; ELECTRONS; ANNIHILATION; EXCITATION; HYDROGEN; ATOM; POTENTIALS; HE;

D O I：

10.1088/1361-6455/ab4027

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Positron scattering by Ar, Kr and Xe was investigated considering two well-established semiempirical potentials with different descriptions of the asymptotic positron-atom scattering potential. Exploring the ultimate nature of semiempirical formulations, two independent semiempirical models were studied. In the first model, the potential parameters were fixed to reproduce the experimental values of the positron-atom scattering length, while, in the second, they were tuned to better fit experimental absolute folded differential cross sections through a chi(2) approach. Results showed that the introduction of higher order polarisabilities and hyperpolarisabilities considerably improved the description of the forward scattering and the total and grand-total experimental low energy cross sections.

引用

页数：13

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