离子在荷电气/水界面的X射线荧光光谱
X-ray fluorescence spectroscopy from ions at charged vapor/water interfaces
摘要：
本文报道了一价离子（Cs+）的X射线荧光光谱。Cs+从稀溶液中积累，在带电的朗缪尔单分子层附近形成富离子层。对于没有单层的盐溶液，低于临界角的荧光信号显著低于检测灵敏度，并且仅观察到来自本体的高于临界角的信号。在提供表面电荷的单层存在下，观察到低于临界角的强荧光信号。在界面处积累的离子密度由荧光确定。收集的荧光光谱作为入射X射线能量的函数附近的LIII边缘产生的扩展的吸收光谱的离子，并比较最近的独立结果。还提供了二价Ba ~（2+）在单层和非单层情况下的荧光数据。
英文摘要：
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.
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