B. Karthikeyan¹, K. Balachandra Kumar¹, N. Rajamanickam^1*and S. P. Bagare^2
1Physics Resear;ch Centre, VHNSN Col lege, Virudhunagar 626 001, India
²Indian Institute of Astrophysics, Bangalore 560 034, India

Abstract. Astrophysical applications are broadened by the emerging consensus on the vibration-electronic (vibronic) transition probability parameters such as Franck - Condon (FC) factors & r - centroids of some molecular species like C N , which could be useful in the identification of molecular lines and in the estimation of relative abundance of the species in various celestial bodies especially in the interstellar medium. Such important parameters, that is FC factors and r - centroids, have been computed by a reliable numerical integration procedure for the bands of E² sum⁺ - X² sum⁺,D² prod i -A² prod i, E² sum⁺ - A² prod i, F ²Delta r -A²prod i and J² Delta i - A²prod i systems of astrophysical molecule CN, using a suitable potential. For E - X system, the improved values of FC factors from the revised molecular constants are given along with the already reported values.

Keywords: C N molecule - astrophysical sources - Franck-Condon factors & r-centroids.

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