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Ice Nucleation at the Water–Sapphire Interface:Transient Sum-Frequency Response without Evidence for Transient IcePhase

机译:水-蓝宝石界面处的冰核:暂态和频响应无暂态冰的证据相

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摘要

Heterogeneous ice nucleation at the water–sapphire interface is studied using sum-frequency generation spectroscopy. We follow the response of the O–H stretch mode of interfacial water during ice nucleation as a function of time and temperature. The ice and liquid states each exhibit very distinct, largely temperature-independent responses. However, at the moment of freezing, a transient response with a significantly different intensity is observed, with a lifetime between several seconds and several minutes. The presence of this transient signal has previously been attributed to a transient phase of ice. Here, we demonstrate that the transient signal can be explained without invoking a transient ice phase, as the transient signal can simply be accounted for by a linear combination of time-dependent liquid and ice responses.
机译:水和蓝宝石界面上的非均质冰核化利用和频产生光谱技术进行了研究。我们遵循冰成核过程中界面水的O–H拉伸模式的响应随时间和温度的变化。冰和液态分别表现出非常不同的,很大程度上与温度无关的响应。然而,在冻结的时刻,观察到瞬态响应具有明显不同的强度,其寿命在几秒到几分钟之间。该瞬态信号的存在先前已归因于冰的瞬态阶段。在这里,我们证明了瞬态信号可以在不调用瞬态冰相的情况下进行解释,因为瞬态信号可以简单地由与时间相关的液体和冰响应的线性组合来解释。

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