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) only cover collisions of NH₃ with para-H₂. We will include these data as soon as calculations with ortho-H₂ are completed.

• References
  Danby, G., Flower, D.R., Valiron, P., Schilke, P., Walmsley, C.M. 1988, MNRAS, 235, 229
  Maret, S., Faure, A., Scifoni, E., Wiesenfeld, L. 2009, MNRAS 399, 425