Journal
JOURNAL OF APPLIED PHYSICS
Volume 105, Issue 8, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3117487
Keywords
fluorescence; Langmuir-Blodgett films; monolayers; X-ray fluorescence analysis
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Funding
- U.S. DOE, Basic Energy Sciences, Office of Science [DE-AC02-07CH11358]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, [DE-AC02-06CH11357]
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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.
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