Collective, short-wavelength excitations in liquid gallium
Collective, short-wavelength excitations in liquid gallium
复制标题
液态镓中的集体短波长激发
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
J. Bossy
中科院分区：
文献类型：
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作者：
F. Bermejo;R. Fernández;M. Alvarez;B. Roessli;H. Fischer;J. Bossy
定义明确（即，非过阻尼）集体激发已经在973 K（约高于熔点670 K）下通过非弹性中子散射在液体Ga中被发现。实验结果与以前的调查进行了对比，在$T=326$ K（只有23 K以上的熔化），只有严重阻尼激发被发现，并部分同意与最近报道的从头计算模拟的高温液体。实验数据的解释是辅助从分子动力学模拟，这是使用一个有效的潜在的反演测得的静态结构因子进行的结果。实验和模拟数据的比较揭示了在较高频率下出现的激励的主要非声学特性。
Well-defined (i.e., not overdamped) collective excitations have been found in liquid Ga at 973 K (about 670 K above the melting point) by means of inelastic neutron scattering. The experimental results contrast with a previous investigation carried out at $T=326$ K (only 23 K above melting) where only heavily damped excitations were found, and partially agree with those of recently reported ab initio simulations for the high-temperature liquid. The interpretation of the experimental data is aided by results from a molecular dynamics simulation, which is carried out using an effective potential derived by inversion of the measured static structure factor. A comparison of experimental and simulation data reveals the mostly nonacoustic character of the excitations appearing at higher frequencies.