
Term energies, transition frequencies, and Avalues are based on the spectroscopic constants of Klisch et al. (1995) together with the dipole moment mu=1.45 Debye from Thomson & Dalby (1968). The data file includes all levels in v=0 up to N=20.
Collision computations are from Lique et al (2010), and include the spinrotation structure of CN but not the hyperfine structure. The data file gives Heimpact rates scaled by 1.37 as though they are for H_{2}. The Lique et al paper tabulates rate coefficients from 5 K to 300 K in steps of 5 K, but the number of temperatures has been reduced from from 60 to 12 in the data file.
The data file also includes electron impact collisions: for the lowest transitions connecting N=0 these are from the closecoupling calculation of Allison & Dalgarno (1971), while the rates for the higher transitions are newly computed in the Born approximation.
The second datafile includes the hyperfine structure of CN, up to the N = 12 level at 295 cm^{1} above ground. Collisions with ortho and para H_{2} are included, for temperatures from 5 to 100 K, as calculated by Kalugina & Lique (2015).
