Stark broadening and shift measurements of two doubly excited NI multiplets
Institute of Physics, Opole University, ul. Oleska 48, 45-052 Opole, Poland
Corresponding author: a email@example.com
Revised: 16 September 2005
Published online: 11 October 2005
Experimental Stark-broadening studies of two selected doubly excited NI multiplets from the infrared wavelength range are presented. One of them is very sensitive to interactions with charged particles in plasmas and the other exhibits — at the same plasma conditions — only very small broadening and shift. A high current wall-stabilized arc operated in helium with admixture of nitrogen and hydrogen was applied as the excitation source. The radiation of the plasma was detected by applying a grating spectrometer equipped with a CCD detector. Measurements were performed at electron densities of the plasma between and cm-3, corresponding to temperatures from the range 8000–10500 K. Electron impact widths and shifts of fine structure components of these multiplets were determined. The evaluated Stark broadening parameters , are compared with other experimental data and with calculated Stark effect constants.
PACS: 32.70.Jz – Line shapes, widths, and shifts / 52.70.Kz – Optical (ultraviolet, visible, infrared) measurements
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2005