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19 April 2024

» pubmed » pmid11800796

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L-band x-ray absorption of radiatively heated nickel
C Chenais-Popovics ; M Fajardo ; F Gilleron ; U Teubner ; J-C Gauthier ; C Bauche-Arnoult ; A Bachelier ; J Bauche ; T Blenski ; F Thais ; F Perrot ; A Benuzzi ; S Turck-Chièze ; J-P Chièze ; F Dorchies ; U Andiel ; W Foelsner ; K Eidmann ;
Date:	31 Dec 2001
Journal:	Phys Rev E, 65 (1 Pt 2), 016413
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.
Source:	PubMed, pmid11800796
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