By Rice S. (ed.)
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Extra info for Advances in Chemical Physics,
It often yields valuable feedback for quantum chemical calculations. In contrast to some action spectroscopy techniques, IR absorption spectroscopy is not intrinsically size-selective. All cluster sizes generated in the expansion are observed together, and indirect methods of size assignment are needed. For the study of alcohol clusters, direct absorption in supersonic jets  is particularly powerful. The best compromise between sensitivity, spectral resolution, spectral coverage, reproducibility, and simplicity is probably achieved by the synchronization of pulsed slit jet expansions with FTIR scans [65, 152 154].
It features a strong intramolecular hydrogen bond between the enol OÀ ÀH and the remaining aldehydic CÀ ÀO group. The hydrogen atom is bound in a double-minimum potential, and the resulting tunneling splitting [210, 242] has recently been studied as a function of vibrational excitation [155, 243]. Remarkable decreases of the tunneling splitting, equivalent to increases in the tunneling period, have been found for some vibrations . Due to the strong intramolecular hydrogen bond, the clustering tendency of malonaldehyde is small, unless one studies excited conformations .
Recently, we have succeeded in assigning Raman OH stretching band transitions in ethanolÁwater, ethanol2 Áwater, and ethanolÁwater2 near 3550, 3410, and 3430 cm 1 , respectively . hydrogen bond dynamics in alcohol clusters 29 Isolated ethanol clusters have earlier been studied using CO2 lasers and sizeselective action spectroscopy in the CÀ ÀO stretching range . Attaching or surrounding the ethanol dimer with Ar atoms gives rise to vibrational shifts in both spectral ranges [80, 94] Mixed dimers of ethanol and methanol have been studied as well  and show that methanol prefers to act as a hydrogen bond donor.
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