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Comparative Study on Ion‐Dynamics for Broadening of Lyman Lines in Dense Hydrogen Plasmas
Author(s) -
Lorenzen S.
Publication year - 2013
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.201200118
Subject(s) - ion , plasma , atomic physics , physics , electron , line (geometry) , range (aeronautics) , electron density , spectral line , plasma parameter , electron temperature , computational physics , plasma parameters , materials science , quantum mechanics , geometry , mathematics , composite material
Broadening of spectral lines by a plasma surrounding can be used for plasma diagnostics. Full hydrogen Lyman line profiles are calculated with a quantum‐statistical approach. The effects of plasma electrons and ions on the emitter states are considered separately. The influence of electrons is considered in a dynamically screened Born approximation (collision approximation). For the ions, we apply the quasi‐static approximation and two different approaches to account for ion‐dynamics, namely, the model microfield method (MMM) and the frequency fluctuation model (FFM). We compare resulting widths of Lyman lines in the temperature range T = 10 4 to 10 7 K and the free electron density range n e = 10 23 to 10 26 m –3 . For L α , the error made by neglecting ion‐dynamics increases with increasing temperature and decreasing density, and is at least –15%. Due to the double peaked structure of L β the situation is less systematic. However, a large region exists, where ion‐dynamics does not affect the line shape of L β . (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)