Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...462..789h&link_type=abstract
Astronomy and Astrophysics, Volume 462, Issue 2, February I 2007, pp.789-794
Astronomy and Astrophysics
Astrophysics
7
Ism: Molecules, Molecular Processes, Molecular Data
Scientific paper
Context: It has been shown that the HOCO+ ion is present in interstellar space. As a large number of HOCO+ lines can be observed in the millimeter and submillimeter wavelengths, this molecule is a useful tracer for both the temperature and the density structure of the clouds. Modeling of the spectra will require accurate radiative and collisional rates of species of astrophysical interest. Aims: The paper focuses on the calculation of rotational excitation rate coefficients of HOCO+ by He, useful for studies of low-temperature environments. Methods: Cross sections are calculated using the quantum Coupled States approach for a total energy range 0-200 cm-1. These calculations are based on a new ab initio CEPA (coupled electron pair approach) potential energy surface. It was assumed that the HOCO+ ion was fixed at its theoretical equilibrium geometry. Results: Thermally averaged rate coefficients were calculated from the cross sections, at kinetic temperatures up to 30 K.
Ben Lakhdar Z.
Feautrier N.
Hammami Kamel
Jaïdane N.
Lique François
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