Calculation of H2O Far-Wing Absorption within the Single-Perturber Approximation.
Final rept. Dec 81-Jan 85,
GTE LABS INC WALTHAM MA
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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.
- Atomic and Molecular Physics and Spectroscopy