Calculations of Triple Differential Cross-Sections for the Ionization of H (3S) by Electron Impact

Tania Noor

doi:10.11648/j.ajmp.20160506.11

Abstract

In the present study we have calculated the Triple Differential Cross-Sections (TDCS) for the ionization of metastable 3S-state hydrogen atoms at 250 eV incidence electron energy for various kinematic conditions in the asymmetric coplanar geometry. A final state wave function of multiple scattering theory [11] has been used in the present study. The present results show a good qualitative agreement with the existing hydrogenic ground state experimental data and various related theoretical results. Some results of hydrogenic metastable states are also presented here for comparisons. However there is no existing theoretical and experimental works on hydrogenic metastable 3S-state except an existing theoretical first born result of Vuc<img width="7" height="16" src="http://article.sciencepublishinggroup.com/journal/122/1221089/image001.png" />i<img width="7" height="16" src="http://article.sciencepublishinggroup.com/journal/122/1221089/image001.png" /> et al. [19].

Highlights

The ionization study of atoms by electrons and positrons is one of the most important challenges problems for astrophysics, plasma physics and radiation physics
The first theoretical study on the second born triple differential cross-sections (TDCS) for the coplanar asymmetric ionization of hydrogenic metastable 2S-state by fast electrons was done by Vuiet al. [19]
We studied here the second born triple differential cross sections for the ionization of metastable 3S-state hydrogen atoms by electrons at incident electron energy of 250 eV for some varied ejected angles ( and for a fixed scattering angle ( )

Summary

Introduction

The ionization study of atoms by electrons and positrons is one of the most important challenges problems for astrophysics, plasma physics and radiation physics. The first theoretical study on the second born triple differential cross-sections (TDCS) for the coplanar asymmetric ionization of hydrogenic metastable 2S-state by fast electrons was done by Vuiet al. Using this multiple scattering theory [11] good cross sectional results for the ground state hydrogenic ionization [11, 13] and hydrogenic metastable state ionization [22, 23, 40, 41] by electrons have been calculated successfully This multiple scattering theory [11] is used widely in the study of medium-heavy atoms ionization by electrons and positrons in the relativistic energy region [17, 24, 35, 36]. The (e, 2e) symmetric coincidence experiments by Amaldi et al [37] have been monitored by this type of experiments

Theory

Result and Discussion

Conclusions