Accession Number:

ADA282011

Title:

The Atom-Atom Potential in Pressure-Broadened Line Width Calculations for XY2-AB: New Expressions in the II(R), II(L), and I(R) Representations.

Descriptive Note:

Technical rept.,

Corporate Author:

MASSACHUSETTS UNIV LOWELL CENTER FOR ATMOSPHERIC RESEARCH

Personal Author(s):

Report Date:

1993-08-01

Pagination or Media Count:

50.0

Abstract:

With the help of symbolic manipulations in FORTRAN and MATHEMATICA, we have computerized the procedure for obtaining atom-atom intermolecular potentials from the two-center expansion. We have calculated the atom-atom potential for an XY2 molecule C2 sub v symmetry and a linear, AB molecule with the XY2 molecule positioned in the molecule-fixed axes at three different orientations representations labeled I sup R, II sup R, II sup L. We have found that the previous development of the atom-atom potential in the II sup R representation is incorrect, leading to a mixed formulation with electrostatic terms in the I sup R and atom-atom terms in the III sup L representation. Broadening-coefficient calculations presented there show that when the correct potential is used anomalous oscillations in the Ka1 transitions for O3 broadened by N2 disappear. Further investigation has shown that the variations can be associated with particular quantum symmetries. Improved agreement with the experimental measurements is observed.

Subject Categories:

  • Atomic and Molecular Physics and Spectroscopy
  • Inorganic Chemistry
  • Numerical Mathematics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE