Experimental ion contribution to the Stark broadening of neutral-nitrogen spectral lines in the vacuum uv

Journal Article · Mon Sep 01 00:00:00 EDT 1980 · Phys. Rev., A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.22.1034· OSTI ID:5056967

Nubbemeyer, H

The ion contribution to the Stark broadening, as described by a suitably defined asymmetry function A/sub L/, was investigated from the asymmetry behavior of the vacuum-uv spectral lines of N I at 119.955 nm (/sup 4/P ..-->.. /sup 4/S/sup 0/), 141.194 nm (/sup 2/D ..-->.. /sup 2/P/sup 0/), 149.467 nm (/sup 2/P ..-->.. /sup 2/D/sup 0/), and 174.273 nm (/sup 2/P ..-->.. /sup 2/P/sup 0/). The line radiation, which was emitted under controlled optical depths, was generated in a dense equilibrium plasma (wall-stabilized arc; electron number density 4.0 x 10/sup 22/ m/sup -3/ < or = n/sub e/ < or = 3.7 x 10/sup 23/ m/sup -3/; temperature 11 000 < or = T < or = 15 000 K). Deviations between experimental asymmetry functions of this study and those calculated from recently published data by Griem, have been found for the wings of N I 119.955 nm (normalized wavelength distance from the line center ..delta..lambda/..delta..lambda/sub 1/2/ > or = 1; A/sup Griem//sub L/--Astudy/sub L/ < or = 0.1). For N I 141.194, N I 149.467, and N I 174.273 nm, the asymmetry functions based on line profiles calculated by Griem are in agreement with the asymmetry functions of this study within the given uncertainties. In addition, Stark-width and Stark-shift parameters were experimentally determined for the N I spectrum between 118 and 180 nm. The Stark-width parameters calculated by Griem and by Wilson and Nicolet agreed with the data of this study within +- 20%. Only for N I 131.054 and N I 132.663 nm did the Stark-width parameters calculated by Wilson and Nicolet deviate from the corresponding values of this study by approximately +31%. The calculated Stark-shift parameters of Wilson and Nicolet, however, were considerably higher than the corresponding data of this study (maximum deviation +78%), whereas the Stark-shift parameters calculated by Griem showed smaller deviations from the data of this study (maximum deviation +49%).

• Research Organization: Physikalisch-Technische Bundesanstalt, Institut Berlin, Abbestrasse 2- 12, D-1000 Berlin 10, Germany
• OSTI ID: 5056967
• Journal Information: Phys. Rev., A; (United States), Vol. 22:3
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
NITROGEN
STARK EFFECT
ULTRAVIOLET SPECTRA
FAR ULTRAVIOLET RADIATION
LINE BROADENING
LINE WIDTHS
PLASMA DIAGNOSTICS
CRYOGENIC FLUIDS
ELECTROMAGNETIC RADIATION
ELEMENTS
FLUIDS
NONMETALS
RADIATIONS
SPECTRA
ULTRAVIOLET RADIATION
640302* - Atomic
Molecular &amp; Chemical Physics- Atomic &amp; Molecular Properties &amp; Theory