Energy levels, transition frequencies and Einstein A coefficients were taken from the JPL
catalogue. Note that the transition frequencies are only of spectroscopic accuracy for the file including hyperfine splitting.
The collisional rate coefficients were taken from Offer et al. (1994) and were calculated for
temperatures in the range
from 15 to 300 K for collisions with both
para-H2 and ortho-H2. At present no extrapolated rate coefficients are made available.
Offer, A.R., van Hemert, M.C., van Dishoeck, E.F. 1994, J. Che. Phys. 100, 362