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HIGH SYMMETRY EFFECTS ON HYDROGEN BOND REARRANGEMENT : THE 4.1 THZ VIBRATIONAL BAND OF (D2O)4

Vibration–rotation–tunneling (VRT) spectroscopy has been extended to the 4 THz spectral region through the observation of a second intermolecular vibration of (D2O)4. Analysis of the precisely measured perpendicular transition confirms the previously reported cyclic homodromic structure and reveals a dramatically increased (30×) hydrogen bond rearrangement rate in the excited state.