Water dimer tunneling states with K=0

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Abstract
Tunneling–rotational transitions of water dimer with K=0 have been observed and assigned in the radio frequency and microwave region of the spectrum. Rotational constants and electric dipole moments were obtained from these spectra. The rotational constants show surprisingly large variations with tunneling state for (H2O)2, but not for (D2O)2, indicating that the former species may be following behavior characteristic of a low-barrier tunneling case. A tunneling splitting of 19 526.73 MHz has been observed for water dimer and 1172.23 MHz for the completely deuterated species. The nuclear hyperfine structure of (H2O)2 radio frequency transitions has been assigned and was quite useful for determining the symmetries of the observed states. The nuclear spin–spin coupling constants have been interpreted in terms of the tunneling state of observation and of the water dimer structure.