Emission-line polarization degrees and n l m l distributions produced by state-selective electron capture in slow Kr 8 + − Li ( 2 s ) collisions

Polarization degrees of lines emitted by ${\mathrm{Kr}}^{7+}$ excited ions produced by single-electron capture during ${\mathrm{Kr}}^{8+}+\mathrm{Li}(2s)$ collisions were experimentally measured for projectile energies between 0.1 and $2.5$ ${\mathrm{keV}\mathrm{}\mathrm{amu}}^{\ensuremath{-}1}.$ They were compared with theoretical polarization degrees obtained from $n\mathcal{l}{m}_{\mathcal{l}}$ distributions calculated by using the classical trajectory Monte Carlo (CTMC) method; radiative cascades have been included in the calculations. The fair agreement between experimental and calculated polarization degrees confirms the reliability of the CTMC method and allows one to analyze the ${m}_{\mathcal{l}}$ distributions in terms of dynamical couplings responsible for the state-selective electron capture process.