Time-Resolved Study of Crystallization in Deeply Cooled Liquid Parahydrogen

被引：37

作者：

Kuehnel, Matthias ^{[1
]}

Fernandez, Jose M. ^{[2
]}

Tejeda, Guzman ^{[2
]}

Kalinin, Anton ^{[1
]}

Montero, Salvador ^{[2
]}

Grisenti, Robert E. ^{[1
,3
]}

机构：

[1] Goethe Univ Frankfurt, Inst Kernphys, D-60438 Frankfurt, Germany

[2] CSIC, Inst Estruct Mat, Lab Mol Fluid Dynam, E-28006 Madrid, Spain

[3] GSI Helmholtzzentrum Schwerionenforsch, D-64291 Darmstadt, Germany

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 24期

关键词：

CRYSTAL-NUCLEATION; MOLECULAR-HYDROGEN; SUPERFLUID; PHASE;

D O I：

10.1103/PhysRevLett.106.245301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present real-time measurements of the crystallization process occurring in liquid para-hydrogen (para-H-2) quenched to approximate to 0.65T(m) (T-m 13.8 K is the melting point of bulk liquid para-H-2). The combination of high spatial resolution Raman spectroscopy and liquid microjet generation allows, in situ, capturing structural changes with similar to 10(-8) s time resolution. Our results provide a crystal growth rate that rules out a thermally activated freezing process and reveal that the quenched melt freezes into a metastable polymorph, which undergoes a structural transition. The achieved temporal control offers new opportunities for exploring the elementary processes of nonequilibrium phase transformations in supercooled liquids.

引用

页数：4

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