F. Schuller, EXTENDED IMPACT THEORY OF PRESSURE BROADENING OF SPECTRAL-LINES FOR VAN-DER-WAALS INTERACTION POTENTIALS, Journal of quantitative spectroscopy & radiative transfer, 60(1), 1998, pp. 43-51
We study the extension of the impact theory of foreign gas line broade
ning 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 dispers
ion type contribution which introduces an asymmetry into the profile.
We rederive this result by a new rigorous method and discuss the resul
ts in terms of the Weiss-kopf radius defined for one-term van der Waal
s interaction potentials. In this way, precise criteria for the validi
ty domain of the theory can be established. (C) 1998 Elsevier Science
Ltd. All rights reserved.