Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5416180 | Journal of Molecular Spectroscopy | 2006 | 9 Pages |
Abstract
The absorption by the RÂ (0) and RÂ (1) lines of the fundamental band of HI broadened by He have been measured in the 0-500Â mbar pressure range using a tunable difference frequency generation laser spectrometer. The observed transmissions have been fitted and analyzed with a line-coupling model based on the infinite order sudden approximation. It is demonstrated that the three hyperfine components of the RÂ (0) manifold have identical widths and are not coupled by collisions. On the contrary, the profile of the RÂ (1) manifold cannot be modeled without accounting for both line-mixing and for the fact that the nine hyperfine components have different broadening parameters. This is, to our knowledge, the first demonstration of line coupling within hyperfine components.
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Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
P.-M. Flaud, J. Orphal, C. Boulet, J.-M. Hartmann,