Character of F core excitons in alkali fluorides studied by resonant Auger spectroscopy

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Abstract
The resonant KLL Auger spectra of fluorine have been measured from in situ evaporated films of LiF, NaF, and KF using synchrotron radiation of the MAX I storage ring, Lund, Sweden. The measured Auger electron spectra show strong enhancement at the F 1s absorption edge. New Auger peaks appear at excitation energies below the photoionization threshold. These peaks are shifted to higher kinetic energies in comparison with the normal Auger spectra. They correspond to the excitation of the core excitons followed by the resonant Auger transitions where the excited electron remains as a screening spectator electron during the Auger decay. With the aid of resonant features we have identified the regions of different character inside the comparatively wide absorption peaks. The atomic picture and the comparison with the isoelectronic Ne atom have been applied successfully in the interpretation of the spectra of F.