Analysis of the Dependence of the H20 Line Shift Coefficients on Vibrational and Rotational Quantum Numbers

摘要

The pressure line shift coefficients are calculated for several vibrational bands of water vapor in a nitrogen atmosphere. The contributions from various terms of the interaction potential and from the scattering channels corresponding to molecular dipole transitions in absorption are studied. The calculations showed that only a few channels contribute considerably to the total shift coefficient with a possible cancellation of separate contributions. A pronounced vibrational dependence of the shift coefficient is attributed to the different action of the intermolecular interaction mechanism on the transitions to lower and higher excited vibrational states.