Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....45..417m&link_type=abstract
Astronomy and Astrophysics, vol. 45, no. 2, Dec. 1975, p. 417-423. In French.
Astronomy and Astrophysics
Astrophysics
9
Iron, Optical Transition, Plasma Spectra, Spectral Line Width, Stark Effect, Doppler Effect, Electron Density Profiles, Fourier Analysis, Gas Spectroscopy, Helium-Neon Lasers, Infrared Interferometers, Line Spectra, Perturbation Theory, Plasma Density, Plasma Generators, Shock Tubes, Shock Wave Propagation, Spectrophotography
Scientific paper
The time-resolved spectrum of Fe I was obtained from the emission of a plasma produced in a classical shock tube with diaphragm. The low pressure region of the shock tube was initially filled with a gaseous mixture of Fe(CO)5 diluted in neon, to which xenon was then added in an amount which depended on the desired electron density. Time resolution was achieved through a spectrograph with rotating disk; measurement of plasma electron density was accomplished with the aid of an Ashby-Jephcott (1963) laser interferometer, which recorded the evolution of the plasma refraction index in the form of an interferogram. The Stark constants were computed from the electron density data, and the results were compared to those obtained from the Unsold approximation and the theory of perturbations. Experimental values obtained for transitions starting from the same upper level were very close to one another, which confirms the fact that the upper level provides the main contribution to the value of the Stark constant of a transition.
Moity Jacques
Pieri P. E.
Richou Jacques
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