2009/04/15 by Wei Bu, David Vaknin · 40 citations
Chemistry · Physics and Astronomy · #Absorption spectroscopy #Analytical Chemistry (journal) #Divalent #Fluorescence #Fluorescence spectroscopy #Ion #Monolayer #Photochemistry and Electron Transfer Studies #Spectroscopy #Spectroscopy and Quantum Chemical Studies #X-ray Spectroscopy and Fluorescence Analysis #cond-mat.soft
paper · pdf · doi:10.1063/1.3117487
published in Journal of Applied Physics 105(8) (American Institute of Physics)
openalex publication_date 2009/04/15 · arxiv created 2009/05/04 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 LIII 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.