采用紧束缚模型研究了纳米结构原子链系统的等离激发,利用量子响应理论得出了等离激元的本征频率方程,并数值计算了该体系中等离激元的能谱,讨论了能谱对系统尺度和电子密度等的依赖关系.结果表明:(1)同等尺度下,等离子体的激发能量总是比同一级的单电子激发能量大；(2)等离激元的能谱与原子链的长度和电子密度以及系统的库仑关联强度密切相关；(3)在原子链长度保持不变的情况下,等离子体的激发能量随电子数目的变化以半满为中心呈对称关系,这表明体系中的等离激元对于电子和空穴是对称的.
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