X-ray fluorescence spectroscopy from ions at charged vapor/water interfaces

TitleX-ray fluorescence spectroscopy from ions at charged vapor/water interfaces
Publication TypeJournal Article
Year of Publication2009
AuthorsBu W, Vaknin D
Journal TitleJournal of Applied Physics
Volume105
Pages084911
Date Published04/29
ISBN Number0021-8979
Accession NumberISI:000268064700192
Keywordsair/water interface, anomalous scattering, cesium, distributions, fluorescence, grazing-incidence diffraction, langmuir monolayers, langmuir-blodgett films, liquid interface, monolayers, monovalent, reflection, water-surface, x-ray fluorescence analysis
Abstract

X-ray fluorescence spectra from monovalent ions (Cs+) that accumulate from dilute solutions to form an ion-rich layer near a charged Langmuir monolayer are presented. For the salt solution without the monolayer, the fluorescence signals below the critical angle are significantly lower than the detection sensitivity and only above the critical angle signals from the bulk are observed. In the presence of a monolayer that provides surface charges, strong fluorescence signals below the critical angle are observed. Ion density accumulated at the interface are determined from the fluorescence. The fluorescent spectra collected as a function of incident x-ray energy near the L-III edge yield the extended absorption spectra from the ions, and are compared to recent independent results. The fluorescence data from divalent Ba2+ with and without monolayer are also presented.

URL<Go to ISI>://000268064700192
DOI10.1063/1.3117487