Excitation functions and absolute cross sections for Sn

K

- and

L

-shell and Ta

L

-shell x-ray production by proton impact have been measured over the energy range 1.4-4.4 MeV with a Si(Li) detector. The results, combined with our measurements on other elements, are compared with existing theories. In the calculation of ionization cross sections from the plane-wave Born approximation, we discuss the effect of a relativistic correction for the ionization potential. The plane-wave Born approximation with the correction due to the Coulomb deflection gives the best fit for Sn

K

x-ray production and the binary-encounter approximation is the best for Sn

L

and Ta

L

x-ray production. The semiclassical approximation based on the impact-parameter treatment predicts values which are not in agreement with the data on Sn

L

x rays. The scaled universal excitation curve based on the binary-encounter approximation gives good fits to

K

-shell ionizations but seems to show some disagreement for

L

-shell ionizations. The dependence of the

\frac{K α}{K β}

ratio of Sn on the target thickness was investigated but it was found that the ratio is constant within the experimental uncertainty. Relative intensities for the transitions

L α

L β

L γ

, and

L_{l}

are also compared with the theories.

Publications with shared reference:

0 publications found