HCN |

Hydrogen cyanide |

Energy levels, transition frequencies and Einstein A coefficients were taken from CDMS version 4 of May 2007.
Collisional rate coefficients are from Dumouchel et al (2010) who have also made calculations for HNC.
The set of rate coefficients was scaled by a factor 1.37 to represent collisions with H We also provide older collisional calculations from Green & Thaddeus (1974) and Green (unpublished data), extrapolated for the temperature range from 5 to 1200 K, and including energy levels up to The third datafile takes the hyperfine splitting (hfs) of the levels up to J=8 into account.
Collision data with H |

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