Non-Markovian energy-corrected sudden model for the rototranslational spectrum of N2

A model generalizing the isotropic-scattering-energy-corrected sudden (ECS) relaxation matrix to arbitrary rank spectra is developed on the basis of a theoretical expression proposed by A.P. Kouzov [Spectral Line Shapes, 14th International Conference on Spectral Line Shapes, State College, PA, 1998, edited by R. M. Herman, AIP Conf. No. 467 (AIP, Woodbury, NY, 1999), Vol. 10, p. 497] for the case of non-Markovian collisions. The constructed matrix obeys all known general relations obtained from first principles: both matrix and Ben-Reuven [Phys. Rev. 141, 34 (1966)] symmetries as well as the double-sided sum rules, In the framework of the present formalism the usual ad hoc detailed balance factor is replaced by a more physical one. Without any additional parameter with respect to the Markovian ECS, this model gives a reasonable description of the N-2 anisotropic depolarized spectrum in the whole frequency range up to the far wing. [S1050-2947(99)08507-8].