Impact parameter dependence ofK-shell excitation probabilities in Ar ? Ar-collisions

Abstract

The impact parameter (b) dependence of the K-shell excitation probabilities (PK(b) 2p~-2pa rotational coupling mechanism gives the dominant contribution to the K-shell excitation at very small b (kinematic peak regime) as well as at very large b (adiabatic peak regime). The analysis of the data indicateS that in disagreement with the general assumption of a b independent 2pz vacancy probability P2p~, the probability P2p~ increases towards smaller b. At the high projectile energy the data confirm the results of Nolte et al. of a large dynamically produced probability P~ and of strong contributions of direct 2po-and lsa excitation to the measured PK(b) at small impact parameters.)