Polarization spectroscopy of He+(nl)produced in collisions of He2+with H in Debye plasmas

Abstract

Polarization spectroscopy of He${}^{+}$($\mathit{nl}$) ion produced in He${}^{2+}$-H(1$s$) collisions in a Debye plasma is studied by the two-center atomic orbital close-coupling (TC-AOCC) method in the energy range 1--200 keV/u. The atomic orbitals and electron binding energies of atomic states are calculated within the Debye-H\uckel approximation of the screened Coulomb potential and used in the AOCC dynamics formalism to calculate the magnetic substate-selective electron-capture cross sections. It is demonstrated that the screening of Coulomb interactions affects the entire collision dynamics and the magnitude and energy behavior of $m$-state-selective cross sections. The changes in magnetic substate-selective electron-capture cross sections when the interaction screening varies introduce dramatic changes in the polarization spectroscopy with respect to the unscreened interaction case. The magnetic substate-selective electron-capture cross sections, as well as the polarization degrees for the $2p {}^{2}{P}_{3/2}$--$1s {}^{2}{S}_{1/2},3p {}^{2}{P}_{3/2}$--$2s {}^{2}{S}_{1/2},3d {}^{2}{D}_{5/2}$--$2p {}^{2}{P}_{3/2}$, and $3d {}^{2}{D}_{3/2}$--$2p {}^{2}{P}_{1/2}$ transitions in the He${}^{+}$ ion produced in this collision system, are presented and discussed for a number of representative screening parameter values.