Abstract
Theoretical resonance fluorescence calculations are presented of the triatomic C3 radical and are compared with observations of the C3 emission in comets Hale-Bopp and de Vico. A theoretical model of the C3 vibration-rotational structure in the electronic system is introduced. The model takes into account the detailed structure of the bending mode which is responsible for the emission of the 4050 Agroup. A total of 1959 levels are considered, with 515 levels in the ground state. The main effort is to model high-resolution spectra of the 4050 A emission in comets C/1995 O1 Hale-Bopp and 122P/1995 S1 de Vico. The agreement between observed and theoretical spectra is good for a value of the dipole moment derivative of Debye A-1 . The modeled C3 emission exhibits a pronounced Swings effect.
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