Measurement of impact parameter dependent probabilities and total cross sections for target K-shell ionization by He ions.

We have measured the impact parameter dependent K-shell ionization probabilities P ( b) of Ca, Cr and Cu from collisions with 4.04 MeV He ions by particle- K X ray coincidences. A dependence on the target thickness was investigated to study a possible influence of multiple collisions on P( b). We measured the total cross section σ for K vacancy production simultaneously with P( b) and σ agrees within 30% with the integrated P( b). A comparison of the P( b) and σ with SCA calculations of Trautmann et al. using RHFS wavefunctions for united atom and separated atom states is discussed. [ABSTRACT FROM AUTHOR]