Radiative Auger spectra of several K and Ca compounds

Abstract

K-MM radiative Auger (RA) spectra have been measured for several compounds containing K and Ca. Transition energies are evaluated by the use of various sources: the DV-X α calculation, term values from optical spectroscopy, and L-MM Auger energies. It is shown that the DV-X α calculation is very useful in the understanding of RA spectra; calculated transition energies agree well with observed ones as well as those estimated from optical data, giving an unambiguous assignment for the observed spectra. On the other hand, transition energies evaluated from L-MM Auger energies sometimes disagree with others. Possible reasons for the discrepancy are discussed.

High-resolutionKMMradiative Auger x-ray emission spectra of calcium induced by synchrotron radiation

“…The first column of the table lists all KMM shake-up RA dipole transitions allowed by the selection rules proposed by Bloch [1] and Aberg [7]. The energies of the corresponding transitions calculated with the DV-Xα for solid [10] and radiative field methods for atomic Ca [12] are given in the 3rd and 4th column, respectively. Finally, the RA edge energies derived in [24] from the LMM Auger transition energies reported by Larkins [47] are also listed (5th column).…”

“…The theoretical energies calculated using the DV-Xα [10] and radiative field [12] models as well as the values deduced from the Auger transition energies [24] are also listed for comparison.…”

“…KMM-RAE final configuration EXEFS a DV-Xα [10] Radiative field [12] Transition edge [24] 3p −2 3 P 4p…”

“…The EXEFS method [5] and DV-X α [10] calculations were considered to assign properly the structures observed in the RAE spectra. While the experimental transition energies were found to agree well with the results of these two models, the observed RA transition edges were found to lie systematically above the values derived in [24] from the LLM Auger electron energies reported by Larkins [47].…”

“…On the other hand, for a given initial inner-shell vacancy, the relative RA x-ray emission yield increases with the principal quantum number of the electrons involved in the transition because of the higher shake probability characterizing the less bound outer shell electrons. However, large discrepancies exist between the existing experimental data and the available shake-off (up) [7], configuration interaction (CI) [9], DV-X α [10], and radiative field [11,12] calculations for the relative intensities as well as for the RA x-ray emission spectral shapes.…”