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Title: Absolute photoionization cross sections along the Xe isonuclear sequence: Xe{sup 3+} to Xe{sup 6+}

Abstract

Absolute photoionization cross sections of Xe{sup 3+} to Xe{sup 6+} ions have been measured over an extended photon energy range from the first ionization threshold to 160 eV. Single and double photoionization cross sections have been obtained. In the case of Xe{sup 3+} and Xe{sup 6+} ions, two completely independent setups, both based on the merged beam technique, have been used. Multiconfiguration Dirac-Fock calculations were performed to interpret the spectra in the region of 4d electron excitations. The partition of the oscillator strength between the discrete photoexcitation and the direct photoionization channels in the 4d subshell has allowed us to follow precisely the collapse of the 4f wave function for these ions of the isonuclear series of Xe.

Authors:
; ;  [1]; ;  [2]; ;  [3]
  1. Laboratoire d'Interaction des Rayons X avec la Matiere (LIXAM), UMR 8624 du CNRS, Universite Paris-Sud, B. 350, and Laboratoire pour l'Utilisation du Rayonnement Electromagnetique (LURE), 91405-Orsay cedex (France)
  2. CEA DAM Ile-de-France, DPTA, Boite Postale 12, F-91680 Bruyeres-le-Chatel (France)
  3. Department of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C (Denmark)
Publication Date:
OSTI Identifier:
20974589
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. A; Journal Volume: 73; Journal Issue: 2; Other Information: DOI: 10.1103/PhysRevA.73.022718; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; BEAMS; CATIONS; CROSS SECTIONS; DIRAC EQUATION; ELECTRONS; EV RANGE 100-1000; EXCITATION; HARTREE-FOCK METHOD; MULTICHARGED IONS; OSCILLATOR STRENGTHS; PHOTOIONIZATION; PHOTON-ATOM COLLISIONS; SPECTRA; WAVE FUNCTIONS; XENON; XENON IONS

Citation Formats

Bizau, J. M., Cubaynes, D., Wuilleumier, F. J., Blancard, C., Champeaux, J. P., Folkmann, F., and Lemaire, J. L. Absolute photoionization cross sections along the Xe isonuclear sequence: Xe{sup 3+} to Xe{sup 6+}. United States: N. p., 2006. Web. doi:10.1103/PHYSREVA.73.022718.
Bizau, J. M., Cubaynes, D., Wuilleumier, F. J., Blancard, C., Champeaux, J. P., Folkmann, F., & Lemaire, J. L. Absolute photoionization cross sections along the Xe isonuclear sequence: Xe{sup 3+} to Xe{sup 6+}. United States. doi:10.1103/PHYSREVA.73.022718.
Bizau, J. M., Cubaynes, D., Wuilleumier, F. J., Blancard, C., Champeaux, J. P., Folkmann, F., and Lemaire, J. L. Wed . "Absolute photoionization cross sections along the Xe isonuclear sequence: Xe{sup 3+} to Xe{sup 6+}". United States. doi:10.1103/PHYSREVA.73.022718.
@article{osti_20974589,
title = {Absolute photoionization cross sections along the Xe isonuclear sequence: Xe{sup 3+} to Xe{sup 6+}},
author = {Bizau, J. M. and Cubaynes, D. and Wuilleumier, F. J. and Blancard, C. and Champeaux, J. P. and Folkmann, F. and Lemaire, J. L.},
abstractNote = {Absolute photoionization cross sections of Xe{sup 3+} to Xe{sup 6+} ions have been measured over an extended photon energy range from the first ionization threshold to 160 eV. Single and double photoionization cross sections have been obtained. In the case of Xe{sup 3+} and Xe{sup 6+} ions, two completely independent setups, both based on the merged beam technique, have been used. Multiconfiguration Dirac-Fock calculations were performed to interpret the spectra in the region of 4d electron excitations. The partition of the oscillator strength between the discrete photoexcitation and the direct photoionization channels in the 4d subshell has allowed us to follow precisely the collapse of the 4f wave function for these ions of the isonuclear series of Xe.},
doi = {10.1103/PHYSREVA.73.022718},
journal = {Physical Review. A},
number = 2,
volume = 73,
place = {United States},
year = {Wed Feb 15 00:00:00 EST 2006},
month = {Wed Feb 15 00:00:00 EST 2006}
}
  • Absolute photoionization cross-section measurements for a mixture of ground and metastable states of Xe{sup 4+}, Xe{sup 5+}, and Xe{sup 6+} are reported in the photon energy range of 4d{yields}nf transitions, which occur within or adjacent to the 13.5 nm window for extreme ultraviolet lithography light source development. The reported values allow the quantification of opacity effects in xenon plasmas due to these 4d{yields}nf autoionizing states. The oscillator strengths for the 4d{yields}4f and 4d{yields}5f transitions in Xe{sup q+} (q=1-6) ions are calculated using nonrelativistic Hartree-Fock and random phase approximations. These are compared with published experimental values for Xe{sup +} to Xe{supmore » 3+} and with the values obtained from the present experimental cross-section measurements for Xe{sup 4+} to Xe{sup 6+}. The calculations assisted in the determination of the metastable content in the ion beams for Xe{sup 5+} and Xe{sup 6+}. The experiments were performed by merging a synchrotron photon beam generated by an undulator beamline of the Advanced Light Source with an ion beam produced by an electron cyclotron resonance ion source.« less
  • Using a photoionization depletion method to measure the flux of a metastable atom beam in situ we have determined absolute cross sections for photoionization of the excited rate gas atoms Ar*(4p {sup 3}D3, Kr*(5p {sup 3}D3) and Xe*(6s {sup 3}P0) in a cross beam arrangement. The overlap of the ionizing laser and the atomic beam is taken into account by a method, in which the ionizing laser is scanned across the excited atomic beam.
  • Cross sections for single photoionization of Fe{sup 3+}, Fe{sup 5+}, and Fe{sup 7+} ions were measured at spectral resolutions of 0.04, 0.15, and 0.13 eV, respectively, by merging mass- and charge-selected ion beams with a beam of monochromatized synchrotron undulator radiation. The measurements span photon energy ranges beginning at the ionization thresholds and extending several tens of electron volts to include the most important resonant contributions due to 3p-nd transitions to autoionizing states. The photoion yield spectra are characterized by narrow resonances and also broad features in Fe{sup 3+} and Fe{sup 5+} that are believed to result from unresolved fastmore » super-Coster-Kronig transitions following 3p-3d excitation. Absolute photoionization cross-section measurements were also performed using ion beams containing undetermined fractions of ions in their ground and metastable states. A Rydberg series attributed to 3p-nd transitions from the {sup 2}G{sub 1} metastable state in Fe{sup 3+} was identified. The data are compared with recently published measurements on Fe{sup 3+} and Fe{sup 5+} using a similar technique at lower spectral resolution.« less
  • Absolute cross sections have been obtained for the reactions /sup 6/Li(d,n/sup 3/He)/sup 4/He and /sup 6/Li(d,p/sup 3/H)/sup 4/He for deuteron energies from 100 to 800 keV. The energy spectra of particles from these reactions are continuums because of the three-body final state. Total cross sections as well as angular distributions have been obtained with accuracies of 10 to 17%. Comparisons of energy spectra are made to predictions of simple models.