Photoionization of 4d-electrons in singly charged Xe ions

Abstract

Using a photon-ion merged-beam technique, we measured the relative yield spectra of Xe 2+ and Xe 3+ ions created by photoionization of Xe + ions as a function of the photon energy in the 4d ionization region. The Xe 3+ ion production, i.e. the double-electron ionization process is found to be dominant throughout the energy range investigated. A broad structure of 4d excitation ionization around 100 eV photon energy was observed in the Xe 3+ yield spectrum. A spectral shoulder was observed for Xe 3+ at around 85 eV, which was absent in the photoionization of neutral Xe. Some discrete lines were observed for both the Xe 2+ -and Xe 3+yield spectra below 75 eV. The experimental spectra were analysed by a multiconfiguration Dirac-Fock calculation. The largest structure at around 100 eV is attributable to 4d 10 5s 2 5p 5 → 4d 9 4f5s 2 5p 4 np (n = 6, 7) two-electron transitions. The discrete lines were found to be due to 4d → np, nf transitions. A serious 4f-orbital collapse is suspected in the 4fnp two-electron excited states, whereas the collapse is moderate in the singly excited 4f-orbitals.

Looking at Molecular Orbitals in Three-Dimensional Form: From Dream to Reality

“…The giant resonance process involved in the TS processes must be largely dominated by forward scattering under the experimental conditions where energies of all the incident and outgoing electrons are very high compared with the energy loss. In addiiton, photoion yield measurements 158 have shown that the giant resonance profile of Xe + is similar in both shape and energy to that of Xe. Hence one can take the peak energy of the EELS spectrum in Figure 17b as a representative of E gr , i.e., E gr = 100 eV.…”

4dPhotoionization of Free Singly Charged Xenon Ions

“…Results on the ion spectra of Xe 1 using synchrotron radiation in the spectral range of the 4d excitation have been presented already by Sano et al [7]. O'Sullivan et al [8] investigated the 4d excitation along the isonuclear series I, I 1 , and I 21 by photoabsorption in a laser-produced plasma.…”

Photoionization Cross Section ofXe+Ion in the Pure5p5P3/Thissen1, Bizau2, Blancard3 et al. 2008Phys. Rev. Lett.322380View full textAdd to dashboardCite

“…It represents the variation of the sum of the intensity of the three main isotopic components (m 129, 131, and 132 u) of Xe 2 ions as a function of the photon energy. All previous experiments on Xe ions, realized using merged-beam setups [18][19][20][21], as well as the previous theoretical investigations [21,22] have focused on the higher energy region of 4d excitations, which is out of the range considered here. The tabulated positions of the different thresholds for the various terms of the Xe 2 5p 4 configuration [17] are reported as vertical bars.…”