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An indirect method for the determination of interatomic potentials from measurements of the far wings of atomic absorption lines perturbed by neutral atoms is described. In this method the potential parameters are derived by optimum adjustment of line shapes calculated on the basis of the PHQSB-theory (binary approximation of the quasistatic theory of line broadening), assuming Lennard- Jones interaction, to measured profiles of an atomic absorption line perturbed by neutral atoms. The method is applied to measurements of the Hg-absorption line λ 2537 Å, perturbed by Ar and Hg at an Ar number density of 1.26 × 10 19  cm -3  and Hg number densities between 7.4 × 10 16  and 3.36 × 10 18  cm -3 , corresponding to temperatures between 427 and 563.5 °K. The reliability of the resulting L.-J.-parameters is discussed by considering the validity criteria of the PHQSB-theory and by comparison with potential curves obtained from other spectroscopic data.

Determination of Interatomic Potentials from the Far Wings of Spectral Lines Perturbed by Neutral Atoms