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 PK(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 of PK(b). We measured the total cross section σK for K vacancy production simultaneously with PK(b) and σK agrees within 30% with the integrated PK(b). A comparison of the PK(b) and σK with SCA calculations of Trautmann et al. using RHFS wavefunctions for united atom and separated atom states is discussed. (orig.)