Site-specific vibrational spectral signatures of water molecules in the magic H 3 O + (H 2 O) 20 and Cs + (H 2 O) 20 clusters
| Autor: | Harald Knorke, Knut R. Asmis, Wieland Schöllkopf, Matias Ruben Fagiani, Joseph A. Fournier, Nadja Heine, Christopher J. Johnson, Conrad T. Wolke, Tim K. Esser, Mark A. Johnson, Sandy Gewinner |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Proceedings of the National Academy of Sciences. 111:18132-18137 |
| ISSN: | 1091-6490 0027-8424 |
| DOI: | 10.1073/pnas.1420734111 |
| Popis: | Significance Understanding the mechanics underlying the diffuse OH stretching spectrum of water is a grand challenge for contemporary physical chemistry. Water clusters play an increasingly important role in this endeavor, as they allow one to freeze and isolate the spectral behavior of relatively large assemblies with well-defined network morphologies. We exploit recently developed, hybrid instruments that integrate laser spectroscopy with cryogenic ion trap mass spectrometry to capture the H 3 O + and Cs + ions in cage structures formed by 20 water molecules. Their infrared spectra reveal a pattern of distinct transitions that is unprecedented for water networks in this size range. Theoretical analysis of these patterns then reveals the intramolecular distortions associated with water molecules at various sites in the 3D cages. |
| Databáze: | OpenAIRE |
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