the carbon-carbon distance from that of graphite (case A) to that of benzene (case B) has very little effect on the calculated ionization potential (the difference is less than 1%) and only a moderate effect on the calculated optical transition energy. For both cases, the calculations predict that the lowest energy electronic transition should lie in the visible region of the spectrum; the absorption
从石墨(情况 A)到苯(情况 B)的碳-碳距离对计算的电离势影响很小(差异小于 1%),对计算的光跃迁能只有中等影响. 对于这两种情况,计算预测最低能量的电子跃迁应该位于光谱的可见区域;发现情况 A 的吸收波长为 492 nm,情况 B 的吸收波长为 468 nm。因此,DV-Xa 计算预测足球形簇 C 中最低的电子跃迁应位于实验可及的能量处。对这种转变的测量将提供宝贵的证据,证明 Smalley 和同事检测到的 c6 物种是否确实形状像一个足球。