Rotational energy levels, statistical weights, transition frequencies and Einstein A coefficients up to 680 cm-1 above ground are from CDMS, version 2 of January 2017.

Collisional rates with H2 are para-H2 rates from Cabrera-González et al (2020), calculated for temperatures in the range from 5 to 300 K for energy levels up to J=18.

Last update: 2022 September 13. Send comments to