Eur. Phys. J. D 29, 265-271 (2004)
https://doi.org/10.1140/epjd/e2004-00026-2

Experimental Stark-broadening studies of the NI multiplet (¹D)3s²D − (¹D)3p²P^o at 7904.5 Å

Institute of Physics, Opole University, ul. Oleska 48, 45-052 Opole, Poland

Corresponding author: ^a bartecka@uni.opole.pl

Received: 6 October 2003
Revised: 23 December 2003
Published online: 9 March 2004

Abstract

Experimental Stark-broadening studies of the NI multiplet (¹D)3s²D − (¹D)3p²P^o are reported. Line shape measurements were performed using a wall-stabilized arc operated at atmospheric pressure in helium with small amounts of nitrogen and hydrogen. The radiation of the plasma emitted from nearly homogeneous plasma layers in end-on direction was measured using a grating spectrometer equipped with a charge-coupled device (CCD) detector. The arc current was varied from 35 to 50 A in order to obtain different plasma conditions (electron densities and temperatures). The so-called j(x) profiles of Griem, convoluted with the corresponding Doppler and apparatus profiles were fitted to the experimental data sets. In this way the Stark broadening parameters: the electron impact shifts and widths as well as ion-broadening asymmetry (A) for the investigated NI multiplet have been determined.