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Journal of Physics B Atomic Molecular and Optical Physics

Broadening and shift of the resonance line of thallium due to collisions with neon and argon atoms

R S Dygdaa, Romuald Bobkowski, E. Lisicki

Published May 28, 1989• 6 citations
Publisher

Abstract

The width and shift of the resonance line of thallium ( lambda =377.68 nm) perturbed by neon and argon were investigated at low perturber densities using a pressure-scanned Fabry-Perot interferometer. The results are compared with those calculated on the basis of the van der Waals, Lennard-Jones and Czuchaj-Sienkiewicz potentials. Results obtained from this experiment are compared with data reported previously for this line and for other transitions in thallium.

DOI
10.1088/0953-4075/22/10/012

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The European Physical Journal D•Jan 1, 1999•2 citations
The width and shift of the resonance line of thallium ( lambda =377.68 nm) perturbed by neon and argon were investigated at low perturber densities using a pressure-scanned Fabry-Perot interferometer. The results are compared with those calculated on the basis of the van der Waals, Lennard-Jones and Czuchaj-Sienkiewicz potentials. Results obtained from this experiment are compared with data reported previously for this line and for other transitions in thallium.
Reports the results of interferometric investigation of collisional broadening and shift of the resonance line of thallium ( lambda =377.68 nm) by krypton and xenon. The measurements were performed at low density of the perturbing gases (3-53*10 16 cm -3 ) and both Doppler and collisional broadening of the line were determined. The results are compared with those calculated on the basis of the van der Waals, Lennard-Jones and Czuchaj-Sienkiewicz potentials. The measured values of the broadening and shift by krypton and xenon are lower than those computed for the van der Waals and Lennard-Jones potentials. Calculations based on realistic potentials reported by Czuchaj and Sienkiewicz give values of the broadening coefficient in good agreement with the experimental data.
Measurements of the self-induced pressure shift of the helium triplet line lambda 706.5 nm (1s2p 3 P 2.1,0 -1s3s 3 S 1 ) from a gas discharge have been carried out at temperatures of 77 K and 300 K using a scanning Fabry-Perot interferometer. The shift coefficient is positive (a blue shift) and at 77 K it is consistent with the results of a theoretical calculation carried out by Leo et al. (1992). At 300 K, the measured shift parameter is much greater than the theoretical value. As expected, the shifts are significantly larger in both cases than those of the corresponding singlet line, for which the broadening and shift are dominated by the resonance interaction. The authors have also compared their experimental results with predictions based on the Lennard-Jones potential.
The spectral profile of the strongly resonance-broadened transition lambda 585.2 nm of Ne I has been studied in absorption. A narrow-band tunable dye laser probed a weak discharge in natural neon cooled with liquid nitrogen. The Lorentzian width extrapolated to zero density was found to be 108+or-20 MHz, consistent with the value 114+or-4 MHz calculated from the natural widths of the levels. There is no indication of the excess width found in earlier emission experiments in helium and neon. A preliminary result of (1.7+or-0.2)10 -21 MHz atom -1 m 3 was obtained for the broadening constant of lambda 585.2 nm in absorption at 77K. This is consistent with the value found in emission.