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A five-dimensional potential-energy surface for the rotational excitation of SO2 by H2 at low temperatures

AuthorsSpielfiedel, A.; Senent, María Luisa ; Dayou, F.; Balana, C.; Cressiot-Vincent, L.; Faure, A.; Wiesenfeld, L.; Feautrier, N.
Issue Date7-Jul-2009
PublisherAmerican Institute of Physics
CitationJournal of Chemical Physics 131: 014305 (2009)
AbstractThe SO2 molecule is detected in a large variety of astronomical objects, notably molecular clouds and star-forming regions. An accurate modeling of the observations needs a very good knowledge of the collisional excitation rates with H2 because of competition between collisional and radiative processes that excite and quench the different rotational levels of SO2. We report here a five-dimensional, rigid-body, interaction potential for SO2 - H2. As a first application, we present rate constants for excitation/de-excitation of the 31 first levels of SO 2 by para- H2 at low temperatures. Propensity rules are discussed. © 2009 American Institute of Physics.
Description9 pags., 8 figs., 7 tabs.
Publisher version (URL)http://dx.doi.org/10.1063/1.3158357
Identifiersdoi: 10.1063/1.3158357
issn: 0021-9606
Appears in Collections:(CFMAC-IEM) Artículos
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