Deep-core photoionization of krypton atoms below and above the 1s ionization threshold

Abstract

Electronic relaxation of atomic Kr below and above the 1s ionization threshold is investigated experimentally using hard x-ray photoelectron spectroscopy. The experimental results are interpreted with the aid of relativistic Dirac-Fock calculations. The 1s orbital core-hole lifetime is extracted and the satellite's structures accompanying the photoelectron main line are assigned. Auger spectra recorded below and above the K edge are also investigated. In particular, the Auger cascade originating from vacancies of different origin in the L shell is analyzed in great detail. Competition between radiative KL versus nonradiative KLL Auger emission is emphasized.

Electron spectroscopy and dynamics of HBr around the Br 1s−1 threshold

“…37. Moreover, the obtained value is 0.25 eV lower than the value of G 1s À1 = 2.65 14eV recently obtained for Kr, 38 which agrees well with the difference of 0.23 eV calculated by Krause and Oliver. 37 In the energy region around 13 500 eV shake-up satellite structures are visible.…”

“…Comparison of the spectra in panels (a) and (c) recorded above and below the K-edge, however, shows subtle differences in the peak intensities. Similar differences have been observed for atomic 1s À1 ionization spectra of Xe 55 and Kr 38 as well as in I 1s À1 ionization of CH 3 I and CF 3 I in ref. 56.…”

“…Panels (b), (d) and (f) show the corresponding theoretical spectra calculated for atomic Br. The Auger spectra are very similar to the respective spectra recorded from atomic Kr, 38,53,54 except for the fact that the Kr spectrum is shifted by D85 eV to higher kinetic energies. Therefore it is possible to identify the main features of the present spectra in more detail by comparison to Fig.…”

“…2 and Table 2 of ref. 38. The similarity is due to the fact that the studied Auger decay takes place between deep core orbitals, which causes the overall shape of the spectra to be similar between Br and Kr.…”

Experimental and theoretical study of the Kr L -shell Auger decay

“…In the last few years also very deep core holes such as the K shells of Br [9], Kr [10], I [11], and Xe [12] became accessible for high-resolution spectroscopy. A recent review with more details on these topics has been published by Piancastelli et al [13].…”