期刊
JOURNAL OF PHYSICAL CHEMISTRY A
卷 119, 期 34, 页码 9148-9159出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpca.5b04721
关键词
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资金
- NCI of NIH [R01CA045424]
- Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences of U.S. Department of Energy [DE-FC02-04ER15533]
Since its discovery over 50 years ago, the structure and properties of the hydrated electron have been a subject for wonderment and also fierce debate. In the present work we seriously explore a minimal model for the aqueous electron, consisting of a small water anion cluster embedded in a polarized continuum, using several levels of ab initio calculation and basis set. The minimum energy zero Kelvin structure found for any 4-water (or larger) anion cluster, at any post-Hartree-Fock theory level, is very similar to a recently reported embedded-DFT-in-classical-water-MD simulation (Uhlig, Marsalek, and Jungwirth, J. Phys. Chem. Lett. 2012, 3, 3071-3075), with four OH bonds oriented toward the maximum charge density in a small central void. The minimum calculation with just four water molecules does a remarkably good job of reproducing the resonance Raman properties, the radius of gyration derived from the optical spectrum, the vertical detachment energy, and the hydration free energy. For the first time we also successfully calculate the EPR g-factor and (low temperature ice) hyperfine couplings. The simple tetrahedral anion cluster model conforms very well to experiment, suggesting it does in fact represent the dominant structural motif of the hydrated electron.
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