High-resolution X-ray emission Mα and Mβ spectra of Bi atoms

The structure and relative intensity of x-ray fluorescence Mα and Mβ spectra of Bi atoms have been studied experimentally under excitation by Cr and Cu Kα1,2 radiation. It has been found that observed short-wavelength satellites are mostly caused by the radiative transitions M5N-N6,7N (M5N satellites) and M4N-N6N (M4N satellites), whereas the transitions M5O-N6,7O and M4O-N6O are overlapped with the profiles of x-ray diagram Mα1,2 and Mβ lines and are not observed as individual structures. The M5N and M4N satellites have been separated from total spectral profiles, and the relative intensities of such groups of lines have been determined. A model has been proposed for calculation of emission cross sections of the M4N and M4N satellites, as well as the Mα1,2 lines along with the M5O satellites and the Mβ line with the M4O satellites. The model takes into account main channels of generation and migration of vacancies in M subshells connected with the Coster-Kronig transitions Mi-MjN and Mi-MjO, radiative transitions Mi-Mj and Mi-Nj, and shaking processes upon production of the Mi vacancy, as well as with cascades of such processes. Comparison of experimental values of the relative intensity of the separated satellites with calculated results indicates the correctness of the model used.