GENERALIZED ANALYTICAL DESCRIPTION OF LIGHT-INDUCED DRIFT AND AN EXPERIMENTAL TEST USING C2H4

It is demonstrated that both standard and anomalous light-induced drif t (LID) profiles as a function of laser frequency can be analytically simulated using the description of LID in terms of transport mean path s. This description allows one to directly link arbitrary LID frequenc y profiles to derivatives of the unsaturated absorption profile. In or der to test this approach, LID experiments have been performed on gase ous ethylene ((CCH4)-C-13-C-12) for the rovibrational transition (7,1, 6) --> nu(7)(8,0,8) in a background of Kr, Xe, SF6, CO2, or CH3Cl. Alt hough the observed LID frequency profiles show a large variation, they are well simulated using this approach.