Excitation of He—41 D-substates by He+- and Ne+-projectiles investigated by level-crossing techniques

Abstract

Abstract. Collisions of He +-and Ne+-projectiles withHe at impact energies between 90 keV and 800 keV were investigated. Relative excitation cross sections for magnetic sublevels of He-41D were determined using levelcrossing techniques. Absolute excitation cross sections o,, of the Zeeman-sublevels are given using He-4 ~D cross sections from earlier measurements. The results show strong variations of the cross sections ao and a+ 1 with a quasi-oscillatory behaviour, a + 2 is much smaller than ao and a_+~.