Eplusmn;2symmetry states forK=0, 1 of (H2O)2are found to be perturbed and a Coriolis resonance model is used to give a satisfactory treatment of the observations. The effectivebhyphen;type Coriolis coupling constant zgr; is 1409.4 MHz, implying appreciable vibrational angular momentum since zgr;/2Cape;1/8. The spacing Dgr; between the upperK=0 levels and the lowerK=1 levels is 10thinsp;719 MHz. The rotational constants from the deperturbation analysis are now found to be in substantially better agreement with those from tunneling states of other symmetries and with the structure of the dimer. The Stark effects of the perturbed states have been analyzed. Theacomponent of the electric dipole moment is well determined; theccomponent appears to be small, but the results are not completely consistent.
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