Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5416233 | Journal of Molecular Spectroscopy | 2006 | 8 Pages |
Abstract
The collisional shifts and widths of several P-branch spectral lines in the fundamental band of CO-Ar have been measured at temperatures between 214 and 324Â K and pressures between 0.025 and 1Â atm. The widths have been determined using a line shape model based on the solution of the transport/relaxation equation for the appropriate off-diagonal element of the density matrix. The model uses a realistic molecular potential energy surface to calculate the speed dependence of the collisional broadening, and a rigid sphere potential to calculate the translational motion. It is found that both the shifting and broadening coefficients follow a power law dependence on the temperature. Additionally, it is demonstrated that studies have tended to overestimate the accuracy of collisional widths when the line shape model used to obtain the widths involves multiple fitted line shape parameters or fails to fit the measured spectra within the experimental noise.
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Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
R. Wehr, A. Vitcu, F. Thibault, J.R. Drummond, A.D. May,