Manifestation of Strongly Delocalized Atomic States in the5sPhotoionization of Xenon

Abstract

The photoionization (PI) of the Xe atom was investigated in the vicinity of the 5s-shell threshold by photon-induced fluorescence spectroscopy. The highest resolution so far attained of 2 meV enabled us to observe a new series of resonance structures in the 5s-PI cross section closely above threshold. Calculations of the partial 5s-and 5p-PI cross sections were performed taking into account manyelectron correlations. These structures were related with strongly delocalized f-resonances which affect the 5s-PI cross section due to their mixing with p-resonances. [S0031-9007 (97)04758-3]

Fine-structure selectivity of neutral dissociation with excitation observed in O2

“…High-resolution investigations of the energy dependence of the ns-subvalence shell PI CS of rare gases have already shown that the 3 m NIM-2 beamline at BESSY I provides a very narrow bandwidth of the exciting radiation [24,25] and is thus very useful for investigating the predissociation of vibrational FS levels.…”

Many-electron dynamics of atomic processes studied by photon-induced fluorescence spectroscopy

“…Adapted from (Schartner et al, 1988b(Schartner et al, , 1990aSukhorukov et al, 1992). (Schartner et al, 1989;Schmoranzer et al, 1997b).…”

“…The ab initio technique described in section 3.3.2 has been widely used in calculations of energy levels of the Rg II ions near the subvalence threshold. Energy levels stemming from ns 1 np 6 and ns 2 np 4 mℓ configurations have been investigated for Ar (n = 3) in (Sukhorukov et al, 1992;Lagutin et al, 1999;Kammer et al, 2006), for Kr (n = 4) in (Schmoranzer et al, 1993;Sukhorukov et al, 1994b;Lagutin et al, 1994;Demekhin et al, 2005;Sukhorukov et al, 2007), and for Xe (n = 5) in (Lagutin et al, 1996;Schmoranzer et al, 1997b;Ehresmann et al, 2010). All these papers contain also original measurements performed by PIFS.…”

“…Moreover, the absence of cross sections measured directly at the ionic thresholds indicates that those spectroscopic methods are difficult to be applied at threshold due to the ne-cessity of detecting very slow electrons. Further improvements of the PIFS measurement technique allowed Schmoranzer et al (1997b) to achieve a resolution below ∆E = 2 meV and to observe a very impressive resonance structure directly at the 5s threshold of Xe (see the lowest panel of Fig. 34).…”

“…Figure 34: Partial PICS of the 5s main level of Xe. Adapted from(Schartner et al, 1989;Schmoranzer et al, 1997b).…”