Stark broadening of the hydrogen Paschen γ transition at electron densities of the order of 1015 cm-3
Institute of Physics, Opole University, ul. Oleska 48, 45-052 Opole, Poland
Corresponding author: a email@example.com
Published online: 24 April 2003
Stark broadening measurements and calculations of the Paschen γ spectral line of hydrogen () are reported. Investigations have been performed at plasma electron densities between and . As the light source a wall-stabilized arc operated in a helium-hydrogen gas mixture at atmospheric pressure has been applied. The radiation of the plasma emitted from nearly homogeneous plasma layers in end-on direction, was measured with the use of a grating spectrometer equipped with a charge coupled device (CCD) detector. The radiance calibration was carried out against light outputs originating from a tungsten strip radiation standard. The measured FWHM are compared with results of our calculations based on computer simulation techniques (full computer simulation method — FCSM). Our broadening data are also compared with results of other theoretical approaches (MM-method, quasi-static approximation) and with experimental data obtained at electron densities about one order of magnitude larger than ours.
PACS: 52.70.Kz – Optical (ultraviolet, visible, infrared) measurements / 32.70.Jz – Line shapes, widths, and shifts
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2003