LINE MIXING EFFECTS IN THE 00-DEGREES-3-00-DEGREES-0 BAND OF CO2 IN HELIUM .2. THEORETICAL-ANALYSIS

In paper I of this series, important deviations from an additive super position of Lorentzian profiles were experimentally evidenced in the 0 0-degrees-3-00-degrees-0 band of CO2 in He. All the observed deviation s are explained by the collision-induced line mixing effects which sch ematically transfer intensity from the wing of the band to its central part. The IOS approximation has been found to be insufficient while, the ECS approximation leads to theoretical predictions in good agreeme nt with the experimental data over extended ranges of frequency and pe rturber pressure. However it must be emphasized that it has been neces sary to resort to the method in current use for the determination of t he fundamental rates, an ad hoc adjustement starting from the observed linewidths.