Abstract
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 3×1015 and 7×1015 cm-3, corresponding to temperatures from the range 8000–10500 K. Electron impact widths (we) and shifts (de) of fine structure components of these multiplets were determined. The evaluated Stark broadening parameters (we, de) are compared with other experimental data and with calculated Stark effect constants.
Published Version
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