Accession Number:

ADA160405

Title:

Calculation of H2O Far-Wing Absorption within the Single-Perturber Approximation.

Descriptive Note:

Final rept. Dec 81-Jan 85,

Corporate Author:

GTE LABS INC WALTHAM MA

Personal Author(s):

Report Date:

1985-02-01

Pagination or Media Count:

67.0

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.

Subject Categories:

  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE