The line shape of sodium n^2S_1/2 -3^2 P_1/2;3/2 transitions in Na-Cd high pressure discharge

Mioković, Željka and Veža, Damir (2001) The line shape of sodium n^2S_1/2 -3^2 P_1/2;3/2 transitions in Na-Cd high pressure discharge. Fizika A, 10 (3). pp. 129-140. ISSN 1330-0008

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Abstract

We measured sodium atomic lines belonging to the n^2S_1/2-3^2P_1/2;3/2 (n = 5,6,7) series, originating from a high-pressure sodium-cadmium plasma. The observed line shapes are compared with the calculations of the line shapes made within the Bartels' method. The electron density is estimated by Vidal approach (a refined Inglis-Teller method), and the density of sodium and cadmium has been determined using the relationships between the interaction constants of the sodium-sodium (sodium-cadmium) quasimolecule and the shift of the self-absorbed peaks of the sodium resonance line. We assume that the main line-broadening mechanisms of n^2S_1/2-3^2P_1/2;3/2 spectral lines are Stark broadening (by electrons), self-broadening (by neutral sodium atoms) and van der Waals broadening (by cadmium atoms). The electron temperatures are determined by Bartels' method, fitting the calculated to the experimentally measured n^2S_1/2-3^2P_1/2;3/2 line profiles. All three measured lines possess a red asymmetry that can not be attributed to the electron broadening, self-broadening or foreign gas broadening. We suggest that this red asymmetry could be caused by interaction of the radiating sodium atom with sodium and cadmium ions.

Item Type: Article
Keywords: high-pressure Na-Cd plasma, atomic lines, line shapes, Stark broadening by electrons, self-broadening, van der Waals broadening, red asymmetry
Date: 2001
Subjects: NATURAL SCIENCES > Physics
Divisions: Faculty of Science > Department of Physics
Publisher: Hrvatsko fizikalno društvo
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 15 Apr 2014 16:04
Last Modified: 15 Apr 2014 16:04
URI: http://digre.pmf.unizg.hr/id/eprint/839

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