Low-Frequency Modes of Aqueous Alkali Halide Solutions: Glimpsing the Hydrogen Bonding Vibration
Low-Frequency Modes of Aqueous Alkali Halide Solutions: Glimpsing the Hydrogen Bonding Vibration
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DOI：
10.1126/science.1183799
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发表时间：
2010-02-12
期刊：
影响因子：
56.9
通讯作者：
Meech, Stephen R.
中科院分区：
文献类型：
--
作者：
Heisler, Ismael A.;Meech, Stephen R.
水介质中离子的溶剂化是生物学和化学中的基本过程。在这里，我们报告了卤化物离子（氯离子、溴离子或碘离子）与周围水分子之间形成的氢键振动模式的直接时域观察。氢键模式的频率对原子量和离子浓度都很敏感。峰值频率落在 125 至 175 波数范围内，这是使用衍射光学方法通过时域偏振分辨相干拉曼散射获得的光谱区域。观察到的偏振拉曼响应根据阴离子溶剂化壳层的结构进行讨论，并通过水氯化物簇的计算进行建模。
The solvation of ions in aqueous media is a fundamental process in biology and chemistry. Here, we report direct time-domain observations of the hydrogen bond vibrational mode formed between a halide ion (chloride, bromide, or iodide) and the surrounding water molecules. The frequency of the hydrogen bond mode is sensitive to both the atomic weight and the concentration of the ion. The peak frequencies fall in the 125 to 175 wave-number range, a spectral region accessed through time-domain polarization-resolved coherent Raman scattering using a diffractive optic method. The polarized Raman response observed is discussed in terms of the structure of the anion's solvation shell and modeled through calculations on water chloride clusters.