Polarized light emission during very slow ? - Li(2s) collisions (?)

We report on the polarization of lines emitted by excited ions produced by the single-electron capture process during collisions at very low impact energies (E = 0.1 - 1.0). The polarization degrees of lines corresponding to and transitions were measured and were compared with theoretical polarization degrees obtained from distributions calculated by using the classical trajectory Monte Carlo (CTMC) method. A remarkable energy dependence is observed in both the experimental and theoretical results at very low projectile velocity. A qualitative discussion based on the relative importance of the different dynamical couplings is proposed.