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首页> 外文期刊>The Journal of Chemical Physics >A different view of structure-making and structure-breaking in alkali halide aqueous solutions through x-ray absorption spectroscopy
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A different view of structure-making and structure-breaking in alkali halide aqueous solutions through x-ray absorption spectroscopy

机译：通过X射线吸收光谱法观察卤化碱水溶液中的结构制造和结构破坏的不同观点

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摘要

X-ray absorption spectroscopy measured in transmission mode was used to study the effect of alkali and halide ions on the hydrogen-bonding (H-bonding) network of water. Cl~? and Br~? are shown to have insignificant effect on the structure of water while I~? locally weakens the H-bonding, as indicated by a sharp increase of the main-edge feature in the x-ray absorption spectra. All alkali cations act as structure-breakers in water, weakening the H-bonding network. The spectral changes are similar to spectra of high density ices where the 2nd shell has collapsed due to a break-down of the tetrahedral structures, although here, around the ions, the breakdown of the local tetrahedrality is rather due to non-directional H-bonding to the larger anions. In addition, results from temperaturedependent x-ray Raman scattering measurements of NaCl solution confirm the H-bond breaking effect of Na~+ and the effect on the liquid as similar to an increase in temperature.
机译：用透射模式测量的X射线吸收光谱研究了碱金属和卤化物离子对水的氢键（H键）网络的影响。 Cl〜？和Br〜？被证明对I〜？的水结构没有影响。如X射线吸收光谱中主边缘特征的急剧增加所表明的，局部削弱了H键。所有的碱金属阳离子在水中都会破坏结构，削弱氢键网络。光谱变化类似于高密度冰的光谱，在高密度冰中，第二壳由于四面体结构的破坏而塌陷，尽管此处，在离子周围，局部四面体的破坏是由于无方向H-与较大的阴离子键合此外，NaCl溶液的温度依赖性x射线拉曼散射测量结果证实了Na〜+的H键断裂作用以及对液体的作用类似于温度升高。

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