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单词 Koopmans’ theorem
释义
Koopmans’ theorem

Chemistry
  • The principle that the first ionization energy of a molecule is equal to the orbital energy of the ejected electron. It is the basis of the interpretation of spectra in photoelectron spectroscopy. Koopmans’ theorem is an approximation in that it ignores any reorganization of electrons in the ion formed. It is named after the Dutch mathematician and economist Tjalling Koopmans (1910–85), who proved it in 1933.


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