Calculation of H2O Far-Wing Absorption within the Single-Perturber Approximation.
Abstract
Calculations of H2O self-broadening have been carried out for near and far-wing absorption. For the far-wing case, the calculations are based on the single perturber approximation. Only collisions involving continuum states of the two-body system are considered, and an uncoupled-line approximation is assumed. An isotropic interaction potential is included exactly, while anisotropic interactions are treated in perturbation theory. For the anisotropic interaction, both dipole-dipole and dipole-quadrupole collisions are considered in detail. Results of the present calculations indicate, in the near wings, that the dipole-dipole interaction is strongly dominant. As one progresses to the far wings, it is found that the dipole-quadrupole and (by implication) the higher-order multipole interactions become increasingly important. The general indications are that the far-wing absorption is dominated by strong, short-ranged interactions which require detailed analysis. Keywords: Water continuum absorption; Far-wing lineshape.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1985
- Accession Number
- ADA160405
Entities
People
- R. W. Davies
- S. F. Fahey