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Acceptor switching and axial rotation of the water dimer in matrices, observed by infrared spectroscopy.

Författare:
Publiceringsår: 2010
Språk: Engelska
Sidor:
Publikation/Tidskrift/Serie: Journal of chemical physics
Volym: 133
Nummer: 7
Dokumenttyp: Artikel
Förlag: American Institute of Physics

Sammanfattning

Several isotopologues of the water dimer have been studied in different matrices (Ne, Ar, Kr, and p-H(2)) at very low temperatures. A fine structure, which is more or less matrix independent and very similar for different intramolecular fundamentals of the same isotopologic dimer, is present on the high wavenumber side of the main component. The bound OD (OH) stretches of the donor have temperature dependent components. The fine structure and temperature dependency is interpreted as evidence for acceptor switching and rotation of the water dimer around its O-O axis in the matrices studied here. The slow nuclear spin equilibration in H(2)O inhibits the thermal equilibration between the acceptor switching states in H(2)O-DOH and H(2)O-DOD. The condensed environment slows down the acceptor switching rate compared to the gas phase. The antisymmetric stretch of the proton acceptor is assigned by combining information from different matrices with the rotation-acceptor switching model.

Disputation

Nyckelord

  • Chemistry

Övriga

Published
Yes
  • ISSN: 1089-7690

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