Committee 3: Collision Cross Sections and Line Broadening

Abstract

Two review articles have been published (1,2).1.1.Collision broadening by neutral atoms.The continued study of widths and shifts produced by neutral atom impacts at low densities has shown that the Van der Waals interaction ( — C6r−6)as used, for example, in (3), is an inadequate representation of the interatomic potential. The classical theory for a Leonard-Jones potential(C12r−12— C6r−6)has been developed (4) and subjected to experimental test (5). Further improvements result from introducing a term C8r−8in the potential (6) and from allowance for quasi-static effects (7). Applications to broadening by H—atom impact are discussed in (8).