Palma et al. 1988
Palma, A.,, D.J. DeFrees, and A.D. McLean, 1988: Collisional excitation of interstellar water. Astrophys. J. Supp. Series, 68, 287-318, doi:10.1086/191289.
Rates for rotational excitation of water molecules in collisions with He atoms have been obtained from a new, accurate theoretical interaction potential. Rates among the lowest 40 ortho levels are given for kinetic temperatures to 1400 K and among the lowest 29 para levels for kinetic temperatures to 800 K.