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Infrared study of glycolaldehyde isolated in parahydrogen matrix
Justinas Ceponkus1, Wutharath Chin, Michèle Chevalier
1Institut des Sciences Moléculaires d'Orsay, CNRS, Université Paris Sud, CNRS, Orsay 91405, France.
Abstract:
The infrared spectrum of glycolaldehyde sugar model in solid parahydrogen is reported and interpreted in the light of ab initio anharmonic frequency calculations. The advantages of parahydrogen lead to a simplification of its infrared spectroscopy compared to other conventional matrices. Surprisingly, the sugar molecule is found to display an unexpected large bandwidth compared to the smaller organic molecules studied in parahydrogen so far. Among them, only glycolaldehyde possesses an internal hydrogen-bond. Band broadening in glycolaldehyde is interpreted as originating mainly from the presence of the hydrogen-bond and to a lesser extent from clustering with oH(2) impurities.
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