Abstract
Tunnelling in water dimer allows each of the hydrogen atoms to participate in the hydrogen bonding, giving rise to a complicated energy-level scheme and rotational spectrum. As a result of new theoretical and experimental developments, great progress has been made in the analysis and interpretation of this spectrum, yielding detailed information about this hydrogen-bonded interaction. This paper reviews the spectroscopy of this highly non-rigid dimer, which is becoming a prototype system for the study of multidimensional tunnelling problems in weakly bound complexes.

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