Measurements and analysis of collisional line-mixing within nuclear hyperfine components of helium broadened HI lines |
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Authors: | P.-M. Flaud C. Boulet |
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Affiliation: | Laboratoire de Photophysique Moléculaire (UPR3361 du CNRS) Université Paris-Sud, 91405 Orsay cedex, France |
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Abstract: | The absorption by the R (0) and R (1) lines of the fundamental band of HI broadened by He have been measured in the 0-500 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 R (0) manifold have identical widths and are not coupled by collisions. On the contrary, the profile of the R (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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Keywords: | Line-mixing Hyperfine structure |
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