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Another method to correlate inhibition efficiency with parameters of molecular structure is to calculate the fraction of electrons
transferred from inhibitor to metal surface. According to Koopman¡¯s theorem[53], EHOMOandELUMO of the inhibitor molecule
are related to the ionization potential (I) and the electron affinity (A), respectively. The ionization potential and the electron affinity
are defined asI=EHOMOandA=ELUMO, respectively. Then absolute electronegativity (v) and global hardness (c) of the inhibitor
molecule are approximated as follows
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