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Theoretical and Computer-Simulation Studies for Correlational Properties of Dense Hydrogen Plasmas

浓氢等离子体相关性质的理论和计算机模拟研究

基本信息

批准号：
63580002
负责人：
TANAKA Shigenori
金额：
$ 1.41万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

项目摘要

On the basis of the hypernetted-chain (HNC) approximation for the classical ion-ion correlation and the modified-convolution approximation (MCA) for the quantum-mechanical electron-electron and electron-ion correlations, we analyzed the correlational properties of dense hydrogen plasmas through an integral-equation approach. Physical significance of the electron-ion strong coupling effects beyond the RPA treatment was elucidated through investigation of the correlation functions, the thermodynamic functions and the transport coefficients. in those density and temperature regions near the metal-insulator boundary, we found that the behaviors of the correlation functions, the thermo-dynamic functions and the transport coefficients exhibited features remarkably analogous to those observed in an atomic insulator phase.Energy levels of impurity ions C^<5+> and Ne^<9+> embedded in dense hydrogen plasmas were analyzed by adopting specific model descriptions for those radiator atoms. The average polarization of surrounding plasmas was described through solution to the HNC/MCA integral equations. Through comparison between model calculations, we found that the atomic potentials felt by the bound electrons were elevated when the interparticle strong coupling effects and the penetration effects of the plasma particles inside the bound-electron orbitals were taken into account; the resulting energy levels became shallower and the higher levels vanished.Those two results above are essential ingredients in studying the metal-insulator transition in dense hydrogen system.

基于经典离子-离子相关的超网状链（HNC）近似和量子力学电子-电子和电子-离子相关的修正卷积近似（MCA），采用积分方程方法分析了致密氢等离子体的相关性质。通过相关函数、热力学函数和输运系数的研究，阐明了RPA处理后电子-离子强耦合效应的物理意义。在金属-绝缘体边界附近的密度和温度区域，我们发现相关函数、热力学函数和输运系数的行为与原子绝缘体相中观察到的特征非常相似。采用特定的模型描述，分析了嵌入致密氢等离子体中的杂质离子C^<5+>和Ne^<9+>的能级。通过求解HNC/MCA积分方程，描述了周围等离子体的平均极化。通过模型计算的比较，我们发现，当考虑粒子间强耦合效应和等离子体粒子在束缚电子轨道内的穿透效应时，束缚电子感受到的原子势提高了；由此产生的能级变浅，较高的能级消失。这两个结果是研究致密氢体系中金属-绝缘体跃迁的重要依据。