Calculated energy levels and intensities for the nu1 and 2nu2 bands of HDO

A Hamiltonian taking explicitly into account both Fermi and Coriolis interactions has been set up for triatomic molecules of symmetry C/sub s/ and used to reproduce very satisfactorily the available rotational energy levels of the [(100), (020)] interacting states of HDO, providing realistic wavefunctions as well as precise rotational constants and vibrational energies. To calculate line intensities, these wavefunctions were used together with suitably chosen transition moment operators expanded up to degree 2 in Jvector and having the correct symmetry in the C/sub s/ group, leading to hybrid bands of both A- and B- type. Using this formalism, it has been possible to determine, from the fit of the existing experimental intensities, the coefficients appearing in the expansions of the transition moments operators of the 2nu2 and nu1 bands of HDO. 2 references