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【简答题】
某分子由三个相同的原子构成，三个原子位于正三角形之顶点，如图所示，分别记为α、β、γ．有一个价电子可以在三个原子间流动．以H 0 表示此价电子的Hamilton量，以|α〉、|β〉、|γ〉表示电子的原子轨道(分别属于原子α，β，γ)，设电子的原子能级为 〈α|H 0 |α〉=〈β|H 0 |β〉=〈γ|H 0 |γ〉=E 0 (1) 在任何两个原子之间，H 0 的矩阵元为 〈α|H 0 |β〉=〈β|H 0 |γ〉=〈γ|H 0 |α〉=-a， a＞0 (2) 设|α〉、|β〉、|γ〉互相正交，而且是归一化的。
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