The optical spectrum of water is not well-understood. For example, the main absorption peak shifts upwards by 1.3 eV upon condensation of gas-phase water monomers, which is contrary to the behaviour expected from aggregationinduced broadening of molecular levels. We investigate theoretically the effects of electron-electron and electron-hole correlation, finding that condensation leads to delocalisation of the exciton onto nearby hydrogen-bonded molecules. This reduces its binding energy and has a dramatic impact on the line shape. The calculated spectrum is in excellent agreement with experiment.
CITATION STYLE
Schmidt, W. G., Blankenburg, S., Wippermann, S., Hermann, A., Hahn, P. H., Preuss, M., … Bechstedt, F. (2007). Anomalous water optical absorption: Large-scale first-principles simulations. In High Performance Computing in Science and Engineering 2006 - Transactions of the High Performance Computing Center Stuttgart, HLRS 2006 (pp. 49–58). Springer Verlag. https://doi.org/10.1007/978-3-540-36183-1_4
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