Knowledge Bank

We have used the energy corrected sudden scaling theory approach to extract the component collisional interactions of pressure broadened linewidths utilizing this approach we have been able to account for the linewidths and their trends in the fundamental and overtone bands in the HF, DF, HCL and CD systems both self broadened and with various collision partners.$\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>},2,3$ The results of these studies have allowed us to understand the behavior of pressure broadening in terms of the underlying collision dynamics. We have found for example in the HF and HCl systems that rotation-rotation energy transfer collisions are the greatest contributors to the line-widths.Furthermore trends in the linewidths are dominated by the energetics of these types of collisions.On the other hand, rotation-translation energy transfer collisions produce the dominant contributions to the self broadened linewidths of CO and energetics are not as important a consideration. In all systems studied so far we find that contributions due to elastic collisions are small except for reorientation collisions for transitions arising from low J states. The effect of collision partners in the CD system will be reported. The temperature dependence of pressure broadening will be discussed in terms of the underlying collision dynamics. $\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}$DePristo et al, J.C.P. 74, 5031 (1981). $\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$BelBruno et al, J.C.P. 75, 4927 (1981). $\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}$BelBruno et al, J.C.P., Flygare Memorial Issue, in press (March 1983)