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arXiv 1408.3972cond-mat.mtrl-sci
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高压氢气拉曼光谱的有效计算

Efficacious calculation of Raman spectra in high pressure hydrogen

G. J. Ackland, I. B. Magdau

摘要:

我们提出并评估了一种有效的方法来模拟拉曼光谱的分子动力学(MD)计算{ \it没有}定义正常模式。我们将该方法应用于高压氢在高温“第四阶段”:塑料晶体中的固定声子本征模的传统图片打破。投影轨迹到同相分子拉伸被证明是许多数量级的速度比极化率计算,允许在高温下的统计平均。模拟扩展到亚稳态制度,并确定几个制度与不同的时间尺度上,这是表现出的拉曼光谱中的功能在当前的实验极限的解析度。在本文中,我们集中在方法上,在先前的论文中给出了第四相氢的结构的更全面的描述

英文摘要:

We present and evaluate an efficient method for simulating Raman spectra from molecular dynamics (MD) calculations {\it without} defining normal modes. We apply the method to high pressure hydrogen in the high-temperature "Phase IV": a plastic crystal in which the conventional picture of fixed phonon eigenmodes breaks down. Projecting trajectories onto in-phase molecular stretches is shown to be many orders of magnitude faster than polarisability calculations, allowing statistical averaging at high-temperature. The simulations are extended into metastable regimes and identify several regimes associated with symmetry-breaking on different timescales, which are shown to exhibit features in the Raman spectra at the current experimental limit of resolvability. In this paper we have concentrated on the methodology, a fuller description of the structure of Phase IV hydrogen is given in a previous paper

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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