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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Photoemission from Aqueous Alkali-Metal-Iodide Salt Solutions Using EUV Synchrotron Radiation
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Photoemission from Aqueous Alkali-Metal-Iodide Salt Solutions Using EUV Synchrotron Radiation

机译：使用EUV同步加速器辐射从碱金属碘化物水溶液中进行光发射

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The valence band photoemission of aqueous alkali-metal halide solutions is studied for photon energies from 90 to 110 eV. A 6 μm diameter liquid microjet provides a free vacuum surface, allowing water molecules to evaporate without collisions, and hence enables the direct detection of photoelectrons originating from the liquid. The experiments were performed at the MBI undulator beamline of the synchrotron radiation facility BESSY. Here, we focus on the determination of electron binding energies of solvated anions and cations. The effect of different countercations (Li~+, Na~+, K~+, and Cs~+), and salt concentrations is systematically investigated. Electron binding energies of the solvated ions are found to differ considerably from those in the gas phase; contrary to intuition, the energies do not depend on the salt concentration. Measured binding energies can be surprisingly well explained within a simple dielectric cavity model. For a NaI aqueous solution, negative surface excess is inferred from the evolution of the ion photoemission signal as a function of the salt concentration.
机译：研究了碱金属卤化物水溶液在90至110 eV的光子能量下的价带光发射。直径为6μm的液体微喷提供了一个自由的真空表面，使水分子能够蒸发而不会发生碰撞，因此能够直接检测出源自液体的光电子。实验是在同步辐射装置BESSY的MBI波荡器光束线上进行的。在这里，我们专注于溶剂化阴离子和阳离子的电子结合能的确定。系统地研究了不同抗衡离子（Li〜+，Na〜+，K〜+和Cs〜+）和盐浓度的影响。发现溶剂化离子的电子结合能与气相中的有很大不同;与直觉相反，能量不取决于盐浓度。可以在一个简单的介电腔模型中很好地解释测得的结合能。对于NaI水溶液，可根据离子光发射信号随盐浓度的变化推断出负的表面过量。

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