CDW-EIS calculations for multiple ionization of Ne, Ar, Kr and Xe by the impact of H⁺and He⁺, including post-collisional electron emission

Abstract

We present theoretical single to quintuple ionization cross sections for Ne, Ar, Kr and Xe bombarded by H + and He + . Post-collisional contributions due to Auger-like processes are taken into account using recent photoionization data. The present continuum distorted wave-eikonal initial state (CDW-EIS) and first Born approximation results are compared with the experimental data available in the energy range of 50-10 000 keV amu −1 for H + on Ne and Ar, and 50-1000 keV amu −1 for the other cases. In general, the combination of the CDW-EIS with the post-collisional branching ratios describes well the multiple ionization data above 300 keV amu −1 , showing a clear tendency to coalesce with the first Born approximation at high energies. The surprising result of this work is the good performance of the first Born approximation which describes rather well the experimental data of double and triple ionization, even in the intermediate energy range (50-300 keV amu −1 ), where direct ionization is the dominant contribution.

Multiple ionization of rare gases by hydrogen-atom impact

“…For the inclusion of the relaxation effects we followed the procedure suggested by Montanari et al [27]. Since the Auger emission depends on the considered shell, we have to write the probability of the vacancy creation separately for each shell (subshell).…”

“…Montanari et al [27] have derived the following expressions for the single, double, and triple ionization probabilities including the Auger transitions:…”

“…(7) does not contain factors that account for events when the electrons are only excited in the shell. Therefore, in our procedure we extended the expressions (7) given by Montanari et al [27] in the following way:…”

Effectiveness of projectile screening in single and multiple ionization of Ne by B2+

“…In collisions with heavy ions, several collision channels are not only important but also strongly coupled among themselves. The independent electron approximation has been widely used as a useful starting point for the analysis of both inclusive (when the collision channels leading to different charge states of the projectile and the target are not separated in the measurements) and exclusive (when the collision channels leading to different charge states of the projectile and the target are separately measured) cross sections of multielectron systems [1][2][3][4] in connection with the energy deposition model [5], the classical trajectory Monte Carlo calculations [6][7][8], or quantal calculations [9,10].…”

Electron-recoil ion and recoil ion-projectile coincidence techniques applied to obtain absolute partial collision cross sections

“…Despite the fact that the multiple ionization of rare gas targets in collision with ions has been extensively investigated over the past several decades, 1 it still continues to pose experimental [2][3][4][5][6][7][8][9][10][11][12][13][14][15] and theoretical challenges. 13,[16][17][18][19][20] For example, studies focused on the comparison between bare or partially stripped ions shed light on the role of the projectile effective charge state in direct multiple ionization processes of rare noble gases. 13 In this work, the total and partial absolute pure ionization and charge exchange cross sections were obtained by combining two techniques: (1) the growth-rate method for the measurement of the total charge exchanging cross sections based on a gas cell setup, and (2) the time-of-flight mass spectrometry and coincidence technique using an effusive gas jet in the molecular flow regime as a target.…”