Long-range correlation energies and off-diagonal interactions for the π electronic systems
Abstract
The long-range correlation energies and the off-diagonal interactions are studied and a general formula for correlation energy Ec of the π electron systems is given, which is beyond the nearest-neighbor electron-electron interactions and includes the off-diagonal interactions. It is found that the effects of the off-diagonal interactions W and X on the correlation energies are opposite, but the influence of X on the correlation energies is much stronger than that of W on the correlation energies, and the correlation energies decrease with increasing the screening effect.
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