Physics
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002phrve..65a6413c&link_type=abstract
Physical Review E, vol. 65, Issue 1, id. 016413
Physics
19
Emission, Absorption, And Scattering Of Electromagnetic Radiation, Plasma Production And Heating By Laser Beams, Radiative Transfer, Scattering, Stellar Atmospheres, Radiative Transfer, Opacity And Line Formation
Scientific paper
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.
Andiel Ulrich
Bachelier Annik
Bauche Jacques
Bauche-Arnoult Claire
Benuzzi Alessandra
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