Knowledge Bank

$H2O$ vibration-rotation energy levels and wave functions are obtained for the eight lowest vibration states through J = 20. Moment-of-inertia matrices are generated from a three-mode, ten-parameter, vibrational potential obtained by fit to 16 experimental I.R. band centers. Dipole matrix elements are generated to obtain absorption line strengths, and the I.R. $H2O$ energy levels of Flaud, Camy-Peret, et al., are employed to obtain accurate line frequencies for hot band absorption at 0 - 50 $cm-1$. Results for ground state $H2O$ are in general agreement with previous tabulations, but differences of 50% occur for some line strengths of rotation lines in the (010) vibration state.