The infrared spectrum of the water trimer trapped in solid neon has been identified. Eighteen groups of absorptions between 1600 and 11,000 cm−1 were assigned to one-, two- and three-quanta transitions of the intramolecular modes. Because of the near equivalence of the three molecules and their weak interactions most of these modes correspond to quasi degenerate vibrations involving the bending δ, free OH stretching (OHf) and bonded OH stretching (OHb) of the three subunits at 1608, 3725 and 3525–3473 cm−1, respectively. In the last case the 52 cm−1 splitting is due to the coupling between the OHb oscillators. Calculated anharmonic frequencies correctly agree with these observations and allow to propose a new assignment of the intermolecular modes. Finally combinations of intra + intermolecular transitions were identified and assigned on the basis of calculated anharmonicity coefficients.
Chemical Physics publishes experimental and theoretical papers on all aspects of chemical physics. In this journal, experiments are related to theory, and in turn theoretical papers are related to present or future experiments. Subjects covered include: spectroscopy and molecular structure, interacting systems, relaxation phenomena, biological systems, materials, fundamental problems in molecular reactivity, molecular quantum theory and statistical mechanics. Computational chemistry studies of routine character are not appropriate for this journal. In addition to regular research papers, Chemical Physics publishes invited perspectives articles (called ChemPhys Perspectives) and Special Thematic Issues. Each Chemical Physics Special Issue provides a snapshot of the leading edge in current research of a particular field in chemical physics, and contains invited articles by specialists in that field. While they are not meant to be reviews as such, the Special Issues should provide easy access to the relevant literature. The objective is to create a collection of articles representative of the newest findings in a field and equivalent to that covered at a topical conference. Guest editors or their designates are encouraged to write a ChemPhys Perspective on the subject of their Special Issue.
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