No abstract

Measurements of Kα and Kβ x rays induced by proton and α-particle beams from an electrostatic accelerator show a divergence from the normal x-ray spectra as the nuclear charge increases. These measurements are consistent with the explanation that the ion excitation produces multiple inner-shell electron vacancies, which in turn cause electronic-shell energy shifts. The intensity of these shifted lines is a measure of the amount of multiple inner-shell ionization.

KX-ray de-excitation spectra have been produced for K and Ti by proton, alpha and oxygen ion beam bombardment. These spectra have been measured with a crystal spectrometer of resolution (FWHM) of 10 and 13 ev for the K~I, 2 line in K and Ti respectively. The additional lines not found in the normal X-ray spectra are attributed to multiple inner shell ionization. The energy shifts and relative intensities of these lines are compared to theoretical predictions.

A thick Mg target was bombarded by a 21-MeV oxygen-ion beam. Nine 1s-2p transitions were observed with an energy resolution of 1.26 eV. with Hartree-Fock-Slater calculations, the five groups of peaks were found to correspond to 1s-2p (Ko.) transitions with initial configurations (1s) (2p)~for n= 0, 1, 2, 3, and 4. The transition for the (1s) (2p) initial configuration was not observed in this experiment. This can be attributed to self-absorption in the target since the (1s) (2p) K& transition energy lies above the K absorption edge.