SCREENING EFFECTS FOR TRANSITION-PROBABILITIES IN COLLISIONS OF CHARGED-PARTICLES WITH AN ATOM OR STRIPPED ION

Screening effects for transition probabilities in collisions of charge d particles with an atom or stripped ion are investigated using the mo dified hyperbolic-orbit path in the semiclassical approximation. Effec tive nuclear charges for bound electrons in many-electron atoms are de termined by new screening constants [Y.-D. Jung and R. J. Could, Phys. Rev, A 44, 111 (1991)]. Applications were made to O, O4+, and O7+. Fo r these targets, the transition probabilities are calculated for 1s--> 2p transitions. The results show that the maximum point of the transit ion probability is shifted to the nucleus with an increase of the scre ening effect. Moreover, the maximum amplitude of the transition probab ility is appreciably reduced as the screening effect increases.