NEW INVESTIGATION OF SATURATION EFFECT IN ION-ATOM EXCITATION

Excitation cross sections of Kr34+ ions colliding with various target atoms (Z(t) between 6 and 40) at upsilon=35 au have been investigated both experimentally and theoretically. The experimental cross sections were obtained from those for production of projectile He-like and H-l ike Lyman x-rays. The combined experimental and theoretical analysis o f H-like emission allowed for a determination of the competitive captu re-ionization process, whose contribution to the Lyman production cros s sections is important for near-symmetric collision systems and has t o be subtracted. A saturation effect of the experimental excitation cr oss sections with Z(1) is analysed from the theoretical point of view through atomic and molecular coupled-state calculations. ,