Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 17, Issue 13, Pages 8427-8430Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4cp04759a
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Funding
- National Science Foundation (US) [CHE-0809324]
- Office Basic Energy Sciences (BES) through SSRL
- Department of Energy through the SLAC Laboratory Directed Research and Development Program
- Air Force Office of Scientific Research through the MURI program under AFOSR Award [FA9550-10-1-0572]
- SSRL Structural Molecular Biology group - National Institutes of Health, National Center for Research Resources, Biomedical Technology Grant
- U.S. Department of Energy, Office of Biological and Environmental Research
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Using small-angle X-ray scattering (SAXS), we obtained direct experimental evidence on the structure of hydrated polyatomic anions, with hydration effects starkly different from those of cations (J. Chem. Phys., 2011, 134, 064513). We propose that the size and charge density of the naked ions do not sufficiently account for the differences in the SAXS curves. For cations, the ion-ion contribution gives a prominent first-order diffraction peak, whereas for anions, the low-Q enhancement in the SAXS curves indicates density inhomogeneities as a result of ion-water interactions.
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