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On the validity of the extended Koopmans’ theorem

✍ Scribed by Pernal, Katarzyna; Cioslowski, Jerzy


Book ID
126171703
Publisher
American Institute of Physics
Year
2001
Tongue
English
Weight
276 KB
Volume
114
Category
Article
ISSN
0021-9606

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On the exactness of extended Koopmans' e
✍ B.T. Pickup; J.G. Snijders 📂 Article 📅 1988 🏛 Elsevier Science 🌐 English ⚖ 436 KB

We discuss conditions under which extended Koopmans' eigenvalues become exact ionisatlon potentials. Second-order perturbation theory is used to compare with known expressions involving relaxation contributions to the exact resulls. In two-electron systems all the EK elgenvalues are shown to be exac