Physics
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jphb...41o5702t&link_type=abstract
Journal of Physics B: Atomic, Molecular, and Optical Physics, Volume 41, Issue 15, pp. 155702 (2008).
Physics
3
Scientific paper
Modelling of the astrophysical spectra requires accurate radiative and collisional rates for species of astrophysical interest. The present paper focuses on the calculation of ro-vibrational excitation rate coefficients of SiS by He, useful for studies of high-temperature interstellar environments. A new accurate three-dimensional potential energy surface for the SiS He system, which explicitly takes into account the r-dependence of the SiS vibration, was determined from ab initio calculations. The dynamic calculations were performed using the vibrational close-coupling rotational infinite order sudden (VCC-IOS) method. Cross sections among the first 100 rotational levels of v = 0 4 are calculated for total energies up to 12 000 cm-1. Rate coefficients between the ro-vibrational levels are calculated for temperatures from 300 K to 1500 K.
Chałasiński Grzegorz
Kłos Jacek
Lique François
Toboła R.
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