Radiative Lifetimes for the A2II and B2SIGMA+ Electronic States of the CN Molecule

Astronomy and Astrophysics – Astrophysics

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Scientific paper

Electronic transition moments, as a function of internuclear distance, have been calculated for the A 2Π↔X 2Σ+, B 2Σ+↔X 2Σ+, and B 2Σ+↔A 2Π transitions in the CN molecule by employing large configuration interaction wave functions. These ab initio electronic transition moments have been combined with vibrational wave functions determined from experimental (RKR) potential energy curves to produce spontaneous transition probabilities and absorption oscillator strengths for these three transitions. The resulting radiative lifetimes for the B 2Σ+ electronic state, and the absorption oscillator strengths to this state from the ground electronic state, are in excellent agreement with the experimental data. The theoretical radiative lifetimes for the A 2Π electronic state are somewhat longer than recent experimental results and decrease monotonically from a value of 11.2 μs at υ' = 0 to 4.5 μs at υ' = 19.

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