LAMDA | RADEX on-line

Energy levels, transition frequencies and Einstein A coefficients were taken from JPL. The collisional rates are taken from Danby et al. (1988) and were calculated for temperatures in the range from 15 to 300 K including energy levels up to about 420 cm-1 for collisions with para-H2. At present no extrapolated rate coefficients are made available.

More recent calculations by Maret et al (2009) use a more accurate interaction potential, but cover a smaller temperature range and do not treat hyperfine structure.

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