Observation of crystallization slowdown in supercooled parahydrogen and orthodeuterium quantum liquid mixtures
Observation of crystallization slowdown in supercooled parahydrogen and orthodeuterium quantum liquid mixtures
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DOI：
10.1103/physrevb.89.180201
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发表时间：
2014-05-21
影响因子：
3.7
通讯作者：
Grisenti, Robert E.
中科院分区：
文献类型：
--
作者：
Kuehnel, Matthias;Fernandez, Jose M.;Grisenti, Robert E.
本文报道了利用液体微射流的高空间分辨率拉曼光谱对仲氢（pH（2））和正氘（oD（2））的过冷量子液体混合物结晶动力学的定量实验研究。我们表明，在广泛的组合物的同位素混合物的结晶速率显着降低相对于纯物质。为了阐明这一行为，我们对非平衡pH（2）-oD（2）液体混合物进行了路径积分模拟，揭示了两种同位素物种之间量子离域的差异转化为不同的有效颗粒尺寸。我们的结果提供了实验证据的结晶减速的量子起源，提供了一个基准的理论研究的量子行为在过冷液体。
We report a quantitative experimental study of the crystallization kinetics of supercooled quantum liquid mixtures of parahydrogen (pH(2)) and orthodeuterium (oD(2)) by high spatial resolution Raman spectroscopy of liquid microjets. We show that in a wide range of compositions the crystallization rate of the isotopic mixtures is significantly reduced with respect to that of the pure substances. To clarify this behavior we have performed path-integral simulations of the nonequilibrium pH(2)-oD(2) liquid mixtures, revealing that differences in quantum delocalization between the two isotopic species translate into different effective particle sizes. Our results provide experimental evidence for crystallization slowdown of quantum origin, offering a benchmark for theoretical studies of quantum behavior in supercooled liquids.