LAMDA | RADEX on-line


pH2O (rovib)
oH2O (rovib)



Spectroscopic data (energy levels, transition frequencies and Einstein A coefficients) were taken from JPL. Full quantum calculations for collisional (de)excitation of ortho- and para-H2O by ortho- and para-H2 are taken from the references given below. These rates were calculated for temperatures in the range from 5 to 1500 K including energy levels up to about 1400 cm-1 (2000 K) above ground.

In addition, collision data are provided for the rovibrational excitation of H2O by H2 and by electrons, after Faure & Josselin (2008). These datafiles include energy levels up to 5000 cm-1 (7200 K) above ground (Tennyson et al 2001) and radiative rates from the BT2 list (Barber et al 2006), and cover collision temperatures from 200 to 5000 K. Note that in these files, the vibrational states are ordered by their energy, not in the traditional scheme where v2 denotes the bending mode. Also, note that the frequencies of high-(v,J) transitions are generally not to spectroscopic accuracy. We thank Alexandre Faure for these rovibrational datafiles.

  • References for collision rates:
    Barber et al. 2006, MNRAS 368, 1087
    Dubernet, M.-L., Daniel, F., Grosjean, A., et al. 2006, A&A 460, 323
    Dubernet, M.-L., Daniel, F., Grosjean, A., & Lin, C. Y. 2009, A&A 497, 911
    Daniel, F., Dubernet, M., Pacaud, F., & Grosjean, A. 2010, A&A 517, A13
    Daniel, F., Dubernet, M., & Grosjean, A. 2011, A&A, 536, A76
    Faure & Josselin 2008, A&A 492, 257
    Tennyson et al. 2001, J. Phys. Chem. Ref. Data 30, 735

  • Reference for potential energy surface:
    Valiron, P., Wernli, M., Faure, A., et al. 2008, J. Chem. Phys., 129, 134306

  • Reference for BASECOL database:
    M.L. Dubernet, A. Grosjean, F. Daniel, D. Flower, E. Roueff, F. Daniel, N. Moreau, B. Debray, Proceedings of Joint Meeting ITC14 and ICAMDATA 2004, Toki, Japan. ``Ro-vibrational Collisional Excitation Database : BASECOL -- http://basecol.obspm.fr/''. Journal of Plasma and Fusion Research SERIES, Vol 7, (2006), p 356-357

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