Cross sections for production of inner-shell vacancies in atoms by proton impact have been examined in an impulse approximation. The model used includes modifications to account for the nuclear repulsion of the proton. Comparisons with experiment and with other calculations are made. It is found that the model compares favorably with existing Born approximations. If the most recent fluorescent-yield data are used, the present results agree well with experiment for proton energies larger than ∼ 300 times the electron binding energies. Determination of fluorescent yields by means of such experiments is also discussed.

• Received 23 September 1969

DOI:https://doi.org/10.1103/PhysRevA.1.280