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andy-lau

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[交流] 请教一个理论知识

各位师兄师姐:谁能帮我回答一下什么是Koopmanns定理,定理内容是什么?在那个地方可以找到?谢谢了!!!
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liuhongzeng

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我也不知道
2楼2007-09-07 18:11:49
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lvzhu2007

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fenghbu(金币+1,VIP+0):thanks
Let me tell you:Koopmans' theorem is an approximation in molecular orbital theory, such as density functional theory, or Hartree-Fock theory, in which the first ionization energy of a molecule is equal to the energy of the highest occupied molecular orbital (the HOMO), and the electron affinity is the negative of the energy of the lowest unoccupied, i.e. virtual, orbital (the LUMO). Electron affinities calculated via Koopmans' theorem are usually quite poor. The theorem is named after Tjalling Koopmans.

[ Last edited by lvzhu2007 on 2007-9-7 at 22:03 ]
3楼2007-09-07 21:56:58
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