期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 117, 期 24, 页码 13374-13378出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2001128117
关键词
hydrogen; deuterium; high pressure
资金
- National Science Foundation of China [11874361, 11404343, 51672279, 51727806, 11774354]
- Chinese Academy of Sciences Innovation Fund [CXJJ-19-B08]
- Science Challenge Project [TZ201601]
- Hefei Institutes of Physical Science Chinese Academy of Sciences Director's Fund [YZJJ201705]
- European Research Council (Hecate)
- EPSRC [EP/P022790/1, EP/K01465X/1, EP/J003999/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/J003999/1] Funding Source: researchfish
Molecular hydrogen forms the archetypical quantum solid. Its quantum nature is revealed by behavior which is classically impossible and by very strong isotope effects. Isotope effects between H-2, D-2, and HD molecules come from mass difference and the different quantum exchange effects: fermionic H-2 molecules have antisymmetric wavefunctions, while bosonic D-2 molecules have symmetric wavefunctions, and HD molecules have no exchange symmetry. To investigate how the phase diagram depends on quantum-nuclear effects, we use high-pressure and low-temperature in situ Raman spectroscopy to map out the phase diagrams of H-2-HD-D-2 with various isotope concentrations over a wide pressure-temperature (P-T) range. We find that mixtures of H-2, HD, and D-2 behave as an isotopic molecular alloy (ideal solution) and exhibit symmetry-breaking phase transitions between phases I and II and phase III. Surprisingly, all transitions occur at higher pressures for the alloys than either pure H-2 or D-2. This runs counter to any quantum effects based on isotope mass but can be explained by quantum trapping of high-kinetic energy states by the exchange interaction.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据