EDP Sciences
Free access
Volume 409, Number 2, October II 2003
Page(s) 771 - 780
Section Celestial mechanics and astrometry
DOI http://dx.doi.org/10.1051/0004-6361:20031133

A&A 409, 771-780 (2003)
DOI: 10.1051/0004-6361:20031133

Measurement of Stark parameters of HeII P $\mathsf{_\alpha}$, P $\mathsf{_\beta}$ and P $\mathsf{_\gamma}$ spectral lines

F. Rodríguez, J. A. Aparicio, V. R. González, J. A. del Val and S. Mar

Departamento de Optica y Física Aplicada, Facultad de Ciencias, Universidad de Valladolid, 47071 Valladolid, Spain
(Received 24 March 2003 / Accepted 7 July 2003)

This work reports information on the pressure broadened profiles of the HeII P $_\alpha$, P $_\beta$ and P $_\gamma$ spectral lines measured in a pulsed discharge lamp. Information relative to the line shapes, full width at 1/2, 1/4 and 1/8 of the maximum intensity and the dip of the HeII 320.3 nm is provided. The electron density has been determined by two-wavelength interferometry and from the Stark width of the HeI 501.6 nm. and ranges during the HeII emission from 0.54 to $0.64 \times 10^{23}$ m -3 in the plasma. Temperature (1.7-2.4 eV) has been simultaneously determined from the Boltzmann-plot of HeI and from local thermodynamic equilibrium (LTE) assumptions. The final results have been compared with most of the previous existing data.

Key words: atomic data -- line: profiles -- plasmas -- methods: laboratory

Offprint request: Dr. J. A. Aparicio, apa@opt.uva.es

© ESO 2003