Positron scattering and ionization of neon atoms —— theoretical investigations

doi:10.1088/1674-1056/19/10/103402

中国物理B ›› 2010, Vol. 19 ›› Issue (10): 103402-103402.doi: 10.1088/1674-1056/19/10/103402

• ATOMIC AND MOLECULAR PHYSICS • 上一篇下一篇

Positron scattering and ionization of neon atoms —— theoretical investigations

Harshit N. Kothari, K. N. Joshipuravs

Department of Physics, Sardar Patel University, Vallabh Vidyanagar-388120, India

收稿日期:2009-12-29 修回日期:2010-03-18 出版日期:2010-10-15 发布日期:2010-10-15
基金资助:
Project supported by ISRO Bangalore--India for a Research Project (Grant No. RES/2/356/08-09), and UGC, New Delhi for Meritorious Research Fellowship through Sardar Patel University, Vallabh Vidyanagar, India.

Positron scattering and ionization of neon atoms —— theoretical investigations

Harshit N. Kothari^† and K. N. Joshipura

Department of Physics, Sardar Patel University, Vallabh Vidyanagar-388120, India

Received:2009-12-29 Revised:2010-03-18 Online:2010-10-15 Published:2010-10-15
Supported by:
Project supported by ISRO Bangalore–India for a Research Project (Grant No. RES/2/356/08-09), and UGC, New Delhi for Meritorious Research Fellowship through Sardar Patel University, Vallabh Vidyanagar, India.

摘要/Abstract

摘要： Although positron scattering with inert gas atoms has been studied in theory as well as in experiment, there are discrepancies. The present work reports all the major total cross sections of e⁺--neon scattering at incident energies above ionization threshold, originating from a complex potential formalism. Elastic and cumulative inelastic scatterings are treated in the complex spherical e⁺--atom potential. Our total inelastic cross section includes positronium formation together with ionization and excitation channels in Ne. Because of the Ps formation channel it is difficult to separate out ionization cross sections from the total inelastic cross sections. An approximate method similar to electron--atom scattering has been applied to bifurcate ionization and cumulative excitation cross sections at energies from threshold to 2000 eV. Comparisons of present results with available data are made. An important outcome of this work is the relative contribution of different scattering processes, which we have shown by a bar-chart at the ionization peak.

Abstract: Although positron scattering with inert gas atoms has been studied in theory as well as in experiment, there are discrepancies. The present work reports all the major total cross sections of e⁺–neon scattering at incident energies above ionization threshold, originating from a complex potential formalism. Elastic and cumulative inelastic scatterings are treated in the complex spherical e⁺–atom potential. Our total inelastic cross section includes positronium formation together with ionization and excitation channels in Ne. Because of the Ps formation channel it is difficult to separate out ionization cross sections from the total inelastic cross sections. An approximate method similar to electron–atom scattering has been applied to bifurcate ionization and cumulative excitation cross sections at energies from threshold to 2000 eV. Comparisons of present results with available data are made. An important outcome of this work is the relative contribution of different scattering processes, which we have shown by a bar-chart at the ionization peak.

Key words: ionization cross sections, positron scattering, complex potential, total cross sections

中图分类号: (Photoionization of atoms and ions)

32.80.Fb

34.80.Uv (Positron scattering)

Harshit N. Kothari, K. N. Joshipuravs. Positron scattering and ionization of neon atoms —— theoretical investigations[J]. 中国物理B, 2010, 19(10): 103402-103402.

Harshit N. Kothari and K. N. Joshipura. Positron scattering and ionization of neon atoms —— theoretical investigations[J]. Chin. Phys. B, 2010, 19(10): 103402-103402.

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Positron scattering and ionization of neon atoms —— theoretical investigations

Positron scattering and ionization of neon atoms —— theoretical investigations

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