Extended impact theory of pressure broadening of spectral lines for van der Waals interaction potentials.

Details Extended impact theory of pressure broadening of spectral lines for van der Waals interaction potentials. Extended impact theory of pressure broadening of spectral lines for van der Waals interaction potentials.

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jqsrt..60...43s&link_type=abstract

Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 60, issue 1, pp. 43-51

Physics

Line Broadening: Molecular Spectra

Scientific paper

The author studies the extension of the impact theory of foreign gas line broadening to the case of non-instantaneous collisions. As has been shown by previous authors, the effect of finite duration of collisions can be taken into account by adding to the usual Lorentzian profile a dispersion type contribution which introduces an asymmetry into the profile. The author rederives this result by a new rigorous method and discusses the results in terms of the Weisskopf radius defined for one-term van der Waals interaction potentials. In this way, precise criteria for the validity domain of the theory can be established.

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