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

纳秒时间分辨率深度淬火量子液体相变动力学的原位光谱研究

• 批准号: 214495933
• 负责人: Privatdozent Dr. Robert Evaristo Grisenti
• 金额: --
• 依托单位: Instituto de Estructura de la Materia (IEM)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/214495933?language=en
• 关键词: situ; spectroscopic; investigation; phase; change

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.

了解基本机制，即，从基础和应用的观点来看，冷却到显著低于其正常熔点的液体中的结晶过程的动力学和动力学在凝聚态物理学中具有根本的重要性。然而，到目前为止，这些现象的实验表征受到了极大的阻碍，总是伴随着观察极快的相变的挑战，其结果是，我们目前的知识主要来自广泛的计算工作。在这里，我们将结合联合收割机高分辨率拉曼光谱和微观液体射流产生的相变过程发生在深淬火液体与纳秒时间分辨率的原位实时调查。我们将特别集中在最简单的量子液体氢和氘及其同位素混合物中发生的液-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，以解决迄今为止未探索的方面之间的相互作用的量子行为和相变动力学在过冷液体。

项目成果

Mixing effects in the crystallization of supercooled quantum binary liquids.

• DOI: 10.1063/1.4928280
• 发表时间: 2015-04
• 期刊: The Journal of chemical physics
• 作者: M. Kühnel;J. Fernández;F. Tramonto;G. Tejeda;E. Moreno;A. Kalinin;M. Nava;D. Galli;S. Montero;R. Grisenti

Observation of crystallization slowdown in supercooled parahydrogen and orthodeuterium quantum liquid mixtures

• DOI: 10.1103/physrevb.89.180201
• 发表时间: 2014-05-21
• 期刊: PHYSICAL REVIEW B
• 影响因子: 3.7
• 作者: Kuehnel, Matthias;Fernandez, Jose M.;Grisenti, Robert E.
• 通讯作者: Grisenti, Robert E.