title: X-ray absorption spectroscopy study of the hydrogen bond network in the bulk water of aqueous solutions.
abstract: We utilized X-ray absorption spectroscopy (XAS) and X-ray Raman scattering (XRS) in order to study the ion solvation effect on the bulk hydrogen bonding structure of water. The fine structures in the X-ray absorption spectra are sensitive to the local environment of the probed water molecule related to the hydrogen bond length and angles. By varying the concentration of ions, we can distinguish between contributions from water in the bulk and in the first solvation sphere. We show that the hydrogen bond network in bulk water, in terms of forming and breaking hydrogen bonds as detected by XAS/XRS, remains unchanged, and only the water molecules in the close vicinity to the ions are affected.
authors.affiliation: Fysikum, AlbaNova, Stockholm University, SE-106 91 Stockholm, Sweden.
authors.forename: Lars-Ake
authors.initials: LA
authors.lastname: Näslund
authors.forename: David C
authors.initials: DC
authors.lastname: Edwards
authors.forename: Philippe
authors.initials: P
authors.lastname: Wernet
authors.forename: Uwe
authors.initials: U
authors.lastname: Bergmann
authors.forename: Hirohito
authors.initials: H
authors.lastname: Ogasawara
authors.forename: Lars G M
authors.initials: LG
authors.lastname: Pettersson
authors.forename: Satish
authors.initials: S
authors.lastname: Myneni
authors.forename: Anders
authors.initials: A
authors.lastname: Nilsson