title: L-band x-ray absorption of radiatively heated nickel.
abstract: Absorption of L-M and L-N transitions of nickel has been measured using point projection spectroscopy. The x-ray radiation from laser-irradiated gold cavities was used to heat volumetrically nickel foils "tamped with carbon" up to 20 eV. Experimental spectra have been analyzed with calculations based on the spin-orbit split arrays statistical approach and performed for each ionic species Ni5+ to Ni11+. Using a least-squares fit, this method provides an ion distribution broader than at local thermodynamic equilibrium, which is explained by spatial and temporal temperature gradients. A major improvement in the simulation of the absolute value of transmission is obtained with a resolved transition array statistical calculation that reproduces the experimental spectrum with the nominal areal mass density by taking into account the saturation of narrow lines.
authors.affiliation: Laboratoire pour l'Utilisation des Lasers Intenses, UMR 7605 CNRS, Ecole Polytechnique, 91128 Palaiseau Cedex, France.
authors.forename: C
authors.initials: C
authors.lastname: Chenais-Popovics
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authors.initials: M
authors.lastname: Fajardo
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authors.lastname: Gilleron
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authors.lastname: Teubner
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authors.lastname: Gauthier
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authors.lastname: Bauche-Arnoult
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authors.lastname: Bachelier
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authors.initials: J
authors.lastname: Bauche
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authors.initials: T
authors.lastname: Blenski
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authors.lastname: Thais
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authors.lastname: Perrot
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authors.lastname: Benuzzi
authors.forename: S
authors.initials: S
authors.lastname: Turck-Chièze
authors.forename: J-P
authors.initials: JP
authors.lastname: Chièze
authors.forename: F
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authors.lastname: Dorchies
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authors.lastname: Andiel
authors.forename: W
authors.initials: W
authors.lastname: Foelsner
authors.forename: K
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authors.lastname: Eidmann