Einstein a Coefficients and Oscillator Strengths for the a ² Π- X ² Σ ⁺ (Red) and B ² Σ ⁺ -X ² Σ ⁺ (Violet) Systems and Rovibrational Transitions in the X ² Σ ⁺ State of Cn

Line strengths have been calculated in the form of Einstein A coefficients and f -values for a large number of bands of the A 2 Π– X 2 Σ + and B 2 Σ + – X 2 Σ + systems and rovibrational transitions within the X 2 Σ + state of CN using Western's pgopher program. The J dependence of the transition dipole moment matrix elements (the Herman–Wallis effect) has been taken into account. Rydberg–Klein–Rees potential energy functions for the A 2 Π, B 2 Σ + , and X 2 Σ + states were computed using spectroscopic constants from the A 2 Π– X 2 Σ + and B 2 Σ + – X 2 Σ + transitions. New electronic transition dipole moment functions for these systems and a dipole moment function for the X 2 Σ + state were generated from high level ab initio calculations and have been used in Le Roy's level program to produce transition dipole moment matrix elements (including their J dependence) for a large number of vibrational bands. The program pgopher was used to calculate Einstein A coefficients, and a line list was generated containing the observed and calculated wavenumbers, Einstein A coefficients and f -values for 290 bands of the A 2 Π– X 2 Σ + transition with v ' = 0–22, v '' = 0–15, 250 bands of the B 2 Σ + – X 2 Σ + transition with v ' = 0–15, v '' = 0–15 and 120 bands of the rovibrational transitions within the X 2 Σ + state with v = 0–15. The Einstein A coefficients have been used to compute radiative lifetimes of several vibrational levels of the A 2 Π and B 2 Σ + states and the values compared with those available from previous experimental and theoretical studies.