形变钠团簇中的电多极等离子体激元
Electric multipole plasmons in deformed sodium clusters
摘要：
提出了一种基于可分离残余力的无规相位近似（RPA）方法，用于描述变形碱金属团簇中价电子的多极电振荡。变形平均场和剩余相互作用都自洽地从Kohn-Sham泛函导出。SRPA大大简化了计算工作，这是紧迫的，如果不是决定性的变形系统。该方法适用于描述偶极，四极和八极等离子体在变形钠团簇的中等大小。我们证明，在尺寸N>50的团簇中，朗道阻尼成功地与形变分裂竞争，甚至在形成偶极等离子体激元的宽度和总体结构方面成为决定性的。此外，等离子体激元是由基态和形状异构体激发产生的。在这样的集群熟悉的偶极等离子体变形分裂的实验估计是无用的。
英文摘要：
The random-phase-approximation (RPA) method with separable residual forces (SRPA) is proposed for the description of multipole electric oscillations of valence electrons in deformed alkali metal clusters. Both the deformed mean field and residual interaction are derived self-consistently from the Kohn-Sham functional. SRPA drastically simplifies the computational effort which is urgent if not decisive for deformed systems. The method is applied to the description of dipole, quadrupole and octupole plasmons in deformed sodium clusters of a moderate size. We demonstrate that, in clusters with the size N>50, Landau damping successfully competes with deformation splitting and even becomes decisive in forming the width and gross structure of the dipole plasmon. Besides, the plasmon is generated by excitations from both ground state and shape isomers. In such clusters familiar experimental estimates for deformation splitting of dipole plasmon are useless.
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