Influence of ion dynamics on the width and shift of isolated He I lines in plasmas

Journal Article · Sun Oct 01 00:00:00 EDT 1989 · Physical Review (Section) A: General Physics; (USA)

DOI:https://doi.org/10.1103/PhysRevA.40.3871· OSTI ID:5337269

Kobilarov, R; Konjevic, N; Popovic, M V ^[1]

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1. Institute of Physics, 11001 Belgrade, P.O. Box 57, Yugoslavia (YU)

We report measured Stark widths and shifts of the neutral helium lines 3889 and 5876 A in hydrogen-helium, pure helium, and argon-helium plasmas. A pulsed low-pressure arc is used as a plasma source. Electron densities of (2--10){times}10{sup 16} cm{sup {minus}3} are measured by laser interferometry, electron temperatures in the range from 31 000 to 42 000 K are determined from the intensity ratio of O II impurity lines, and the gas temperature is determined from the Doppler component of the O II line profile. Experimental Stark widths and shifts are compared with theoretical results obtained from three sets of semiclassical calculations of Stark-broadening parameters using quasistatic and ion-dynamic treatment of the ions. Inclusion of ion dynamics in the calculation of widths and shifts considerably improves the agreement between theory and experiments. The results of the comparison show a constant systematic discrepancy between three semiclassical calculations and the experiment. These results suggest the possibility of plasma-electron-density diagnostics with a precision in the range 3--5 %.

• OSTI ID: 5337269
• Journal Information: Physical Review (Section) A: General Physics; (USA), Journal Name: Physical Review (Section) A: General Physics; (USA) Vol. 40:7; ISSN PLRAA; ISSN 0556-2791
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ARGON
ELECTRON DENSITY
ELECTRON TEMPERATURE
ELEMENTS
EMISSION SPECTRA
FLUIDS
GASES
HELIUM
HYDROGEN
ION MOBILITY
LINE WIDTHS
MOBILITY
NONMETALS
PARTICLE MOBILITY
RARE GASES
SPECTRA
SPECTRAL SHIFT
STARK EFFECT