Proton Configuration in Water Chain on Pt(533)
Proton Configuration in Water Chain on Pt(533)
复制标题
Pt(533) 上水链中的质子构型
DOI：
10.1021/acs.jpclett.2c01378
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Watanabe Kazuya
中科院分区：
文献类型：
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作者：
Nagatsuka Naoki;Shibata Noboru;Muratani Toya;Watanabe Kazuya
在145K超高真空条件下，用外差探测的振动和频产生光谱研究了铂(533)表面的润湿行为，成功地获得了氢键OH伸展区表面非线性极化率的虚部(Imχ(2))，在亚单分子层的水覆盖率中，这些虚部显示出指示台阶和平台上的水的H向下(指向衬底的质子)构型的负带。带覆盖的Imχ(2)信号的生长方式和同位素稀释的结果与一维(1D)链在台阶上形成包含H-down取向的“之”字形结构的模型一致。这一发现解决了之前文献中关于一维水链中质子构型的争论。
In this paper, a wetting behavior of Pt(533) is studied by using heterodyne-detected vibrational sum-frequency generation spectroscopy under an ultrahigh-vacuum condition at 145 K. The imaginary parts of the surface nonlinear susceptibility (Imχ(2)) of the H-bonded OH stretching region are successfully obtained for submonolayer water coverage that show negative bands indicating H-down (proton pointing to the substrate) configurations both for the water at the step and at the terrace. The growth manner of the Imχ(2)signal with coverage and the results of an isotopic dilution are consistent with a model in which a one-dimensional (1D) chain at the step forms a “zigzag” structure that contains H-down orientations. This finding resolves the previous controversy in the literature concerning the proton configuration in the 1D water chain at the step.