Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...307.1023w&link_type=abstract
Astronomy and Astrophysics, v.307, p.1023-1028
Astronomy and Astrophysics
Astrophysics
10
Line: Profiles, Atomic Data, Atomic Processes, Methods: Laboratory, Plasmas
Scientific paper
Measurements of the 2s3s-2s3p singlet and triplet line profiles of Ne VII emitted from a dense plasma are reported. The plasma is produced in a gas-liner pinch discharge and spectral lines are detected in fifth order applying an interference filter to obtain high spectral resolution. We have diagnosed the plasma reliably by Thomson scattering and we obtained electron densities and temperatures in the range of n_e_=(3-3.5)x10^18^cm^-3^ and k_B_ T_e_=(19-20.5)eV, respectively. The widths of the spectral lines are compared with theoretical Stark widths according to semiempirical and semiclassical calculations. We find good agreement in the latter case especially when performing detailed non-perturbative calculations and when taking into account electron quadrupole broadening. These experimental and new theoretical values improve the accuracy of line formation calculations to determine plasma parameters of, e.g., the atmospheres of hot stars.
Alexiou Spiros
Buescher S.
Glenzer Siegfried
Kunze H.-J.
Wrubel Th.
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