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Journal of Physics B Atomic and Molecular Physics

Self-broadening of the Tl 377.6 nm resonance line

Goran Pichler, John L. Carlsten

Published Aug 28, 1978• 3 citations
Publisher

Abstract

Reports preliminary studies on the self-broadening of the 377.6 nm thallium line. In the short wavelength wing asymmetries and a satellite at about 377.1 nm are observed. In the long wavelength quasi-static wing the transition from the Lorentzian to the Van der Waals type wing is clearly observed.
DOI
10.1088/0022-3700/11/16/002

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The shapes of the thallium (Tl) 535- and 377.6-nm resonance lines broadened by 500-1500 Torr of noble gases have been measured at 743 K. The reported normalized emission intensities yield absorption coefficients in absolute units for all portions of the line. The shift and broadening of the Lorentzian-shaped line cores, the wavelengths of the transition to non-Lorentzian wings, wing shapes, and satellite positions, shapes, and intensities are reported. As an example, a pair of excited and ground-state interaction potentials are given for the Xe case to explain the shift, width, and intensities in all portions of the line wings.
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.
Self-broadening of the 146.96 nm xenon line and 123.58 nm krypton line is studied in the density range 1-100 amagat (2.7 x 1019 — 2.7 × 1021 at. cm-3). The absorption profile is deduced from reflection experiments by a modified Kramers-Krönig analysis. A detailed discussion of the criteria for validity of available theories is given, allowing the determination of the extent to which the cases studied are related to many-body interactions and/or pure resonance forces. The quasistatic theory, in the nearest neighbour approximation, is shown to be valid for interpreting the far wings. Thus it is possible at increasing density, to underline the specific effect of the various kinds of forces : resonance, Van der Waals and repulsive, and to specify the 1u excited state potential which is found weakly attractive for Xe2 and Kr2.
16 lines of the principal series of Cs(6 2 s 1/2 to 7-16 2 p 3/2 and 6 2 s 1/2 to 7-12 2 p 1/2 ) were investigated in absorption. Cesium vapour density was varied from 10 13 up to 10 17 cm -3 . Red asymmetries of all lines (extended red wings) were detected. This can be understood if electron transitions in the long-range interaction region follow the selection rules of molecules. It was established that the red and the blue wings of the lines each can be fitted to lorentzian profiles in small wavelength intervals. With the help of quasistatic theory the interaction constants from the long-range interaction potential Delta omega =C 3 /r 3 multiplied by the oscillator strength were determined from measurements. For all lines the ratio of C 3 (red)/C 3 (blue) was found to equal 2 in accordance with earlier theoretical calculations. In the far line wing, deviation from a lorentzian profile occurs. This was interpreted as a consequence of electron transition in the short-range region of interatomic potentials.