Cross sections of charge exchange and ionization in O8+ +H collision in Debye plasmas

Abstract

Charge exchange and ionization processes in O8+ +H collision system in a Debye plasma are studied using the classical trajectory Monte Carlo (CTMC) method in the collision energy ranging from 1 keV/amu to 500 keV/amu. Total charge exchange and ionization cross sections have been determined in both screening and unscreening environments. In the unscreened case, partial cross sections for transfer into individual n shells of the projectile have also been determined. An interesting and remarkable feature of sudden increase in the ionization cross sections at lower velocities is discussed in terms of the CTMC framework. Results are analyzed in light of available theoretical and experimental results. The cross sections dependencies on Debye screening lengths have been investigated, and plasma screening effect on charge exchange and ionization cross sections has been found throughout the collision energies range, but is particularly pronounced at low projectile collision energies. The sudden rise in the ionization cross sections towards lower energies is explained qualitatively in terms of the multiple encounter model.

Review of quantum collision dynamics in Debye plasmas

“…al. [129,130] have studied the charge exchange and ionizaiton in O 8+ -H and He-like system-H collisions in Debye plasmas by classical trajectory Monte Carlo method, and Bhattacharya et al [131] have investigated the proton-hydrogen collisions in Debye plasmas by distorted wave formalism.…”

Doubly excited states of the hydrogen negative ion and helium atom in astrophysical plasmas

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] In weakly coupled thermal plasmas, the screened interaction between the plasma particles can be modeled by the standard Debye-H€ uckel potential obtained by the thermal Maxwellian distributions. In the space environment, however, plasmas are generally observed to possess a non-Maxwellian high-energy tail that can be well modeled by a generalized Lorentzian (or kappa) distribution function containing the spectral index j.…”

Dynamic polarizability of two-electron ions under Debye screening

“…The study of atomic systems embedded in plasma environments is of great importance as this process has been used for plasma diagnostics and several other spectroscopic applications . Several spectral or structural properties of plasma embedded atoms, ions, molecules have been studied based on the Debye shielding approach to plasma modeling . The purpose of this article is to report the behavior of the dynamic dipole polarizabilities (DPP) of two‐electron ions Be 2+ , B 3+ , C 4+ under the influence of Debye plasmas screening.…”