Oscillator strengths for multiple ionization in the outer and first inner shells of Kr and Xe

Abstract

Abstract Oscillator-strength spectra are reported for the formulation of the charge states one to four following N and M ionization in Kr and O and N ionization in Xe. The spectra were derived from coincidence measurements of small-angle inelastically scattered 10-keV electrons in the two gases and the ions formed. The spectra of Kr 1+ and Xe 1+ gave evidence of the presence of a minimum and subsequent maximum in the contribution of 4p-ed transitions in Kr and 5p-ed transitions in Xe. Our study further shows that simultaneous ionization in inner and outer shell of the type (3d,N) in Kr and (4d,O) in Xe behaves like a direct electron-interaction process. Its contribution is quite appreciable and cannot be neglected when one compares calculated 3d (or 4d) photoabsorption with experiment. For that purpose we present a number of separate subshell oscillator-strength distributions. The present results are compared with photoionization and absorption data. Their relation with our previous work on total single and multiple ionization of Kr and Xe by electron impact is discussed.