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Collisional excitation of complex organic molecules

Published online by Cambridge University Press:  01 February 2008

Alexandre Faure
Affiliation:
Laboratoire d'Astrophysique de Grenoble, Université Joseph Fourier/CNRS UMR 5571, France email: afaure@obs.ujf-grenoble.fr
Eric Josselin
Affiliation:
G.R.A.A.L, Université de Montpellier II/CNRS UMR 5024, France
Laurent Wiesenfeld
Affiliation:
Laboratoire d'Astrophysique de Grenoble, Université Joseph Fourier/CNRS UMR 5571, France email: afaure@obs.ujf-grenoble.fr
Cecilia Ceccarelli
Affiliation:
Laboratoire d'Astrophysique de Grenoble, Université Joseph Fourier/CNRS UMR 5571, France email: afaure@obs.ujf-grenoble.fr
Corresponding
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Abstract

A major difficulty in modelling the infrared and (sub)millimeter spectra of gas-phase complex organic molecules is the lack of state-to-state collisional rate coefficients. Accurate quantum or classical scattering calculations for large polyatomic species are indeed computationally highly challenging, particularly when both rotation and low frequency vibrations such as bending and torsional modes are involved. We briefly present here an approximate approach to estimate and/or extrapolate rotational and rovibrational rates for polyatomic molecules with many degrees of freedom.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2008

References

Ceccarelli, C., Caselli, P., Herbst, E., Tielens, A. G. G. M., Caux, E. 2007 in: Reipurth, V. B., Jewitt, D., and Keil, K. (eds.), Protostars and Planets V (University of Arizona Press, Tucson), p. 47Google Scholar
Faure, A. & Wiesenfeld, L. 2004, J. Chem. Phys., 121, 6771CrossRefGoogle Scholar
Levine, R. D. 1978, Ann. Rev. Phys. Chem., 29, 59CrossRefGoogle Scholar
Pottage, J. T., Flower, D. R., & Davis, S. L. 2004a, J. Phys. B, 37, 165CrossRefGoogle Scholar
Pottage, J. T., Flower, D. R., & Davis, S. L. 2004b, MNRAS, 352, 39CrossRefGoogle Scholar
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