Multiple ionization of fast heavy ions by neutral atoms in the energy deposition model

Abstract

Multiple ionization processes of fast heavy low-charged ions in collisions with neutral atoms are considered. Combining the energy deposition model and the statistical probabilities for m-electron ionization, a new computer DEPOSIT code was developed for the calculation of multiple ionization probabilities and cross sections of heavy low-charged ions colliding with neutral atoms. A comparison of the present calculations for ionization of heavy ions (Xe18+, U28+) by various atoms at energies E > 1 MeV u−1 with experimental data and the classical-trajectory Monte Carlo (CTMC) calculations shows that the suggested model can be applied with an accuracy of a factor of 2.

Single- and multiple-electron loss cross-sections for fast heavy ions colliding with neutrals: Semi-classical calculations

“…The code employs the Slater wave functions for the electron density function of projectile ion and a Yukawa-type potential for the field of neutral target atom. The first results obtained in [1] demonstrate that the semi-classical approximation can be successfully applied for calculation of multiple and total electron-loss cross-sections of heavy ions within accuracies of a factor of 2.…”

“…In a previous paper [1] a semi-classical approximation was applied to calculate m-fold electron-loss probabilities and cross-sections using a DEPOSIT computer code created by combining the energy deposition model [2,3] with the statistical ionization probabilities in the impact-parameter representation [4,5]. The code employs the Slater wave functions for the electron density function of projectile ion and a Yukawa-type potential for the field of neutral target atom.…”

Fast low‐rank approximations of multidimensional integrals in ion‐atomic collisions modelling

“…[23]. Theoretical development of the model is presented in [23,24,25,26]. Examples of calculations are reported in [27,28,29,30].…”

Total projectile electron loss cross sections ofU28+ions in collisions with gaseous targets ranging from hydrogen to krypton

“…In the present work, we report on a follow-up experiment using again U 28þ projectiles which was performed under improved experimental conditions and with target gases covering a broader range of the atomic number Z. The experimental data are compared to predictions based on a combination of a classical deposition model (DEPOSIT code) [33,34] and the relativistic ionization code (RICODE) developed by Shevelko et al [35] and, where available, to n-body classical trajectory Monte Carlo (CTMC) calculations by Olson [29].…”