Electron correlation in the Auger spectra of the Ne⁺K 2s2p⁵(^3,1P⁰)3p²S satellites

Abstract

Calculations incorporating the effects of electron correlation on the Auger energies and widths of the neon 1s2(2s2p5)3,1P03p2S states have given results in agreement with the recent measurements of Pahler et al. The Ne+ 1s22s2p5 1P03p2S autoionizing state is above the Ne2+ 1s22s2p5 3P0 threshold and, using the theoretical Auger electron energy, its decay width to this channel is computed to be 0.48 eV. At the Hartree-Fock level this quantity is equal to 0.280 eV. The partial width of the 1P03p 2S state to the Ne2+ 2s22p4 1D channel is essentially zero while that to the Ne2+ 2s22p4 1S channel is 0.028 eV.

Coherence and correlations in photoinduced Auger and fluorescence cascades in atoms

“…In the calculations the width of 2 P comes out two orders of magnitude larger than that of 2 F and 2 D, which is still not sufficient to explain the apparently complete absence of transitions originating from the 2 P state. However, as it was demonstrated earlier (Sinanis et al, 1995), accurate calculations of these widths should include electron correlations on a much larger basis than used in the discussed work. Thus the reason for the absence of the 2p 4 ( 1 D)np 2 P series remains an open question.…”

Photoelectron recapture as a tool for the spectroscopy of ionic Rydberg states

“…In our calculations the width of 2 P comes out two orders of magnitude larger than that of 2 F and 2 D, which is still not sufficient to explain the apparently complete absence of transitions originating from the 2 P state. However, as it was demonstrated earlier [7], accurate calculations of these widths should include electron correlations on a much larger basis than used in the present work. Thus, the reason for the absence of the 2p 4 ͑ 1 D͒np 2 P series is an open question.…”

“…For example, in Ne + , due to a significant singlet-triplet splitting, the 2s2p 5 ͑ 1 P͒3p states lie above the 2s2p 5 3 P level of Ne 2+ and can decay to it. Such transitions, called valence multiplet changing or intermultiplet Auger transitions, are predominant in the low kineticenergy part of the spectrum and determine the large width of the inner-valence-excited ionic states [4][5][6][7][8][9].Spectroscopic information about these two-hole oneparticle states so far was mainly obtained by studies of the satellite structure in the subvalence shell photoionization [10]. The state of the art of such ionization + excitation experiments has recently been demonstrated by Bolognesi et al [11].…”

“…For example, in Ne + , due to a significant singlet-triplet splitting, the 2s2p 5 ͑ 1 P͒3p states lie above the 2s2p 5 3 P level of Ne 2+ and can decay to it. Such transitions, called valence multiplet changing or intermultiplet Auger transitions, are predominant in the low kineticenergy part of the spectrum and determine the large width of the inner-valence-excited ionic states [4][5][6][7][8][9].…”

Core Excitation and De-excitation Spectroscopies of Free Atoms and Molecules

“…21) Comparing the measured values with the calculated ones averaged over the unresolved final J states for each multiplet, we attribute lines 1, 2, and 3 to the transitions to the Ne 68) successfully reproduce the experimental width. This transition is very sensitive to electron correlations and can be well described only if the correlations are fully taken into account.…”