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Pressure Broadening of Lyman‐Lines in Dense Li 2+ Plasmas
Author(s) -
Lorenzen S.,
Wierling A.,
Reinholz H.,
Röpke G.
Publication year - 2008
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.200810097
Subject(s) - plasma , atomic physics , spectral line , full width at half maximum , lithium (medication) , line (geometry) , materials science , absorption (acoustics) , nanosecond , ion , absorption spectroscopy , physics , laser , optics , nuclear physics , medicine , geometry , mathematics , quantum mechanics , astronomy , endocrinology
Pressure broadening of Lyman‐lines of hydrogen‐like lithium is studied using a quantum statistical approach to the line shape in dense plasmas. We report line widths (FWHM) and shifts for L α , L β , and L γ in a wide range of densities and temperatures relevant for laser‐produced lithium plasmas. We estimate the influence of ion dynamics and strong collisions. The results are applied to measured spectra of lithium irradiated by a nanosecond laser pulse of moderate intensities ( I ≈ 10 11 – 10 13 W/cm 2 ), see G. Schriever et al. [1, 2]. By matching synthetic spectra to the experimental ones, density and temperature conditions are inferred assuming the model of a one‐dimensional uniform plasma slab. This allows for a more precise estimate of the density compared to the results reported earlier. Self‐absorption is accounted for and found to be important for L α . (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)