Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004a%26a...421..381a&link_type=abstract
Astronomy and Astrophysics, v.421, p.381-386 (2004)
Astronomy and Astrophysics
Astrophysics
7
Astrochemistry, Ism: Molecules, Molecular Processes, Ultraviolet: Ism
Scientific paper
Calculations of the photodissociation cross sections of CO from the ground X1Σ+ state into the coupled Rydberg B1Σ+ state and the valence dissociative D'1Σ+ state have been carried out using the smooth exterior complex scaling (SECS) method. Results are presented for all of the 6 isotopomers involving the 12C, 13C, 16O, 17O and 18O isotopes. The absorption profiles of the predissociating resonances induced by non-adiabatic coupling vary considerably from one isotopomer to another. It is confirmed that resonance widths obtained simply from a diagonalization of the complex Hamiltonian do not give a true indication of the absorption profile. A correct profile is only obtained when the sum over all resonant and non-resonant continuum states is performed. A brief discussion is given of the implications for isotopic fractionation in interstellar CO.
Andric L.
Bouakline F.
Grozdanov T. P.
McCarroll R.
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