In situ spectroscopic investigation of phase change dynamics in deeply quenched quantum liquids with nanosecond time resolution

从基础和应用的角度，理解液体结晶过程的基本机制，即动力学和动力学，在凝聚态物理中具有极其重要的意义。然而，到目前为止，这些现象的实验表征一直受到极快相变观测带来的挑战的极大阻碍，其结果是，我们目前的知识主要来自广泛的计算努力。在这里，我们将结合高分辨率拉曼光谱和微观液体射流产生，以纳秒的时间分辨率原位实时研究深度淬火液体中发生的相变过程。我们将特别关注发生在最简单的量子液体氢和氦及其同位素混合物中的液-固相变的时间分辨研究。因此，拟议的研究工作将特别提供机会来解决过冷液体中量子行为和相变动力学之间相互作用的迄今尚未探索的方面。

Understanding the basic mechanisms, i.e., kinetics and dynamics, of crystallization processes in liquids cooled significantly below their normal melting point is of fundamental importance in condensed matter physics, from both basic and applied point of views. However, the experimental characterization of these phenomena has so far been greatly hampered by the challenges that invariably accompany the observation of extremely fast phase transitions, with the consequence that our present knowledge primarily comes from extensive computational efforts. Here, we will combine high-resolution Raman spectroscopy and microscopic liquid jet generation for in situ realtime investigations of phase transformation processes occurring in deeply quenched liquids with nanosecond temporal resolution. We will in particular focus on time-resolved studies of liquid-solid phase transitions occurring in the simplest quantum liquids hydrogen and deuterium and in their isotopic mixtures. Thus, the proposed research work will especially offer the opportunity to address so far unexplored aspects of the interplay between quantum behavior and phase change dynamics in supercooled liquids.