Abstract
Theoretical absorption oscillator strengths and emission branching ratios for rotational lines of the c'4 1Σ+ u (3)-X 1Σ+ g (0-5) bands of molecular nitrogen are reported. The calculations have been performed with the molecular quantum defect orbital method, which has proved to be reliable in previous studies of rovibronic transitions in diatomic molecules. The strong interaction between c'4 1Σ+ u (3) and b' 1Σ+ u (10) states has been analyzed through an interaction matrix that includes rotational terms. Owing to the perturbation, the c'4 1Σ+ u (3)-X 1Σ+ g (0), c'4 1Σ+ u (3)-X 1Σ+ g (1), and c'4 1Σ+ u (3)-X 1Σ+ g (5) bands are not weak, in contrast to what would be expected on the basis of the Franck-Condon principle. Moreover, the intensity distribution of the rotational lines within each of the vibronic bands deviates from considerations based on Honl-London factors. In this work, we provide data that may be useful to interpret spectra from atmospheres of the Earth, Titan, and Triton, in which transitions from the c'4 1Σ+ u (3) level have been detected.
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