Theoretical study of the differential cross section of the ionization of hydrogen (2s) by electron impact

Abstract

A b s h c t Electron impact ionization of hydrogen in its 2s metastable state is investigated theoretically. An ob initio calculation is proposed which includes the carelated double continuum Brauner-Brigs-Klar (BBK) wavefunction. ' The results of this model are compared with those given by the use of the second Born approximation, Some interesting kinematical situations are explored for future experiments.

Use of correlated double continuum wave functions for the determination of the triple differential cross section of the ionization of lithium by electron impact

“…to our problem and have written p, using the procedure that we have developed in our preceding paper [7], in the following form:…”

“…We have recently developed and applied [7] following Brauner Briggs and Klar [ 8] a procedure using the double continuum correlated BBK wave function, which contains by its nature the electron-electron correlation of the final state electrons (10), to the calculations of the triple differential cross section (TDCS) of the ionization of hydrogen in its metastable (2 s) state. Our aim in this paper is to extend, in a first place, this procedure to the determination of the TDCS of the ionization of lithium using a model potential, which takes in consideration the inner electrons, to compare them to existing results [5,6], to study the similarities that should exist with the ionization of the excited hydrogen atoms, and finally to present some favourable kinematical situations for experiments.…”

Ionization of metastable H(2S) atom by electron and positron impact

“…recoil region, while 02(180~ ~ refers to binary region (92 = 180~ 9 In the absence of any experiment we have compared our results at Ei = 250 eV (see fig. 1-4) with the corresponding theoretical results of Vucic et al [3] calculated in the framework of the second Born approximation as well as with the results of Hafid et al [4] who adopted the approach of Briggs et al [7] using three Coulomb wave functions in the final state. It may be mentioned that for positron impact the only available theoretical result is due to Vucic et al [3] for the parameters Ei = 250 eV, E2 = 5 eV, 01 = 5 o (see fig.…”

“…The parameters for Ei =250eV have been chosen in accordance with other existing theoretical [3,4] results, available only for this value of energy (E i). Present results have been displayed in fig.…”

“…On the other hand, there is no TDCS measurement so far for ionization of hydrogen atom from metastable state although absolute total cross-section data exist in the literature due to different experimental groups [2]. However, on the theoretical side some calculations on TDCS of metastable states of hydrogen have been performed [3,4] for coplanar, asymmetric geometry where significant differences have been noted in the TDCS structure when compared to the case of ground-state ionization and some new features have been predicted that are not present in the ground-state ionization.…”