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THEORETICAL CALCULATION OF THE N$_2$ BROADENED HALF-WIDTHS OF H$_2$O

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/38241

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Title: THEORETICAL CALCULATION OF THE N$_2$ BROADENED HALF-WIDTHS OF H$_2$O
Creators: Ma, Q.; Tipping, R. H.; Gamache, R. R.
Issue Date: 2009
Abstract: The water molecule is the most important Greenhouse gas and thus plays a pivotal role in atmospheric spectra. In addition to accurate intensities and frequencies, one also needs accurate self and foreign half-widths and shifts, and their temperature dependence. Over the years, a large number of theoretical calculations have been carried out by Gamache and his collaborators, 389 (2007) and references therein.}. They used the complex Robert-Bonamy theory with a sophisticated interaction potential. The drawback of this method is that one has to carry out the calculations to a high-order perturbation in order to obtain converged results. However, by using the coordinate representation one is able to obviate the perturbation expansion and obtain results corresponding to a high cut-off order, 014109 (2006).}. We present comparisons for the H$_2$O-N$_2$ system for a few lines using the same interaction potential for a comparison between the methods. We conclude that for lines having a large half-width, the convergence is rapid but, on the other hand, for lines with relatively small half-widths the convergence is very slow.
URI: http://hdl.handle.net/1811/38241
Other Identifiers: 2009-RI-04
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