Volume 405, Number 2, July II 2003
|Page(s)||397 - 403|
|Published online||19 June 2003|
Astrophysical plasma diagnostics through analysis of line shape characteristics
Faculty of Physics, University of Belgrade, PO Box 368, Belgrade, Serbia
2 Isaac Newton Institute of Chile, Yugoslavia Branch, Belgrade, Serbia
3 Hungarian Academy of Sciences, Budapest, Hungary
Corresponding author: V. Milosavljević, email@example.com
Accepted: 15 April 2003
On the basis of five accurately recorded neutral argon () line shapes (in the 4s–5p transition) we have recovered the basic plasma parameters i.e. electron temperature (T) and electron density (N) using our new line deconvolution procedure in the case of three different plasmas created in a linear, low-pressure, pulsed arc discharge. The mentioned plasma parameters have also been measured using independent experimental diagnostic techniques. An excellent agreement has been found among the two sets of obtained parameters. This recommends our deconvolution procedure for plasma diagnostic purposes, especially in astrophysics where direct measurements of the main plasma parameters (T and N) are not possible. On the basis of the observed asymmetry of the Stark broadened line profile we have obtained not only its ion broadening parameter (A) which is caused by the influence of the ion microfield on the line broadening mechanism but also the influence of the ion-dynamical effect (D) on the line shape. The separate electron () and ion (Wi) contributions to the total Stark width, which have not been measured so far, have also been obtained and represent the first experimental data in this field. We have found a stronger influence of the ion contribution to the line profiles than the existing theoretical approximation provides. This is of importance for astrophysical plasma modeling and diagnostics.
Key words: plasmas / line: profiles / atomic data
© ESO, 2003
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.