Spectral Line Broadening Of Atoms By Noble Gases

The complex universal approach for calculations of the binary broadening of atomic spectral lines by buffer noble gas atoms is presented. The interatomic interaction is described on the basis of the Buckingham potential, parameterized with the help of ab initio electron modeling. The Unified Frank-Condon Theory is used for the calculations of the total line profile. For the first time the impact limit is determined exactly using the Van der Waals long-range tail of the potential and taking into account the degeneracy of quasimolecular states but neglecting non-adiabatic effects. The general asymptotic wings dependences of the profile are established for the Buckingham parameterized potential. The receipts of the wings cut-offs are formulated for the approximate but sufficiently accurate evaluation of the total line profile using only the Van der Waals part of potential to be applied in large scale calculations of radiative transfer.