Monatomic-Molecular Transition in Expanded Rubidium
Monatomic-Molecular Transition in Expanded Rubidium
复制标题
膨胀铷中的单原子分子转变
DOI：
10.1103/physrevlett.78.3685
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发表时间：
1997
影响因子：
8.6
通讯作者：
F. Hensel
中科院分区：
文献类型：
--
作者：
W. Pilgrim;M. Ross;L. Yang;F. Hensel
沿着液汽共存线测量的液态铷的S（Q，{Ω}）从正常密度下降到临界密度的两倍表现出单原子行为。在这个密度下，我们观察到谐振子的激发特性。我们将此解释为流体从单原子状态转变为分子状态的证据。第一原理总能量计算晶格的铷在0 K预测，膨胀有利于自旋配对，并导致晶格的二聚体的振动子能量增加，密度降低。振动子能量的计算值与实验值吻合良好，为分子的出现提供了理论支持。{版权} {美国物理学会}
S(Q,{omega}) for liquid rubidium measured along the liquid vapor coexistence line exhibits monatomic behavior from normal density down to twice the critical density. At this density we observe excitations characteristic of a harmonic oscillator. We interpret this as evidence for the passage of the fluid from a monatomic to a molecular state. First principle total energy calculations for lattices of ribidium at 0K predict that expansion favors spin pairing and leads to a lattice of dimers with an increase in vibron energy with decreasing density. The excellent agreement of the calculated vibron energy with the experimental result provides theoretical support for the appearance of molecules. {copyright} {ital 1997} {ital The American Physical Society}