Electronic ionization potential

The photoelectron spectra of aziridine (1) <74PMH(6)l, 74PMH(6)53> and 2//-azirine (2) have been measured <83JA768i, 87CB1971). The lone-pair ionization potential was found to be 10.58 eV, while the C=N 7t-electron ionization potential was measured as 11.56 eV. These values compared favorably with those obtained from MNDO semiempirical MO calculations. 

Core-Electron Ionization Potentials for Trifluoromethylbenzene Derivatives... 

Figure 6. Corrected valence electron ionization potentials of 5 -dGMP. The hatched area corresponds to an unresolved energy region in the PE spectrum of l,9-Me2G which contains overlapping bands. (Adaptedfrom reference 21. Copyright 1996 American Chamical Society.)...

Figure 7. Corrected valence electron ionization potentials of 5 -dTMP, 5 -dCMP and 5 -dAMP. Molecular orbital diagrams for base orbitals which correlate with orbitals in the model compounds, 1-methylthymine (1-MeT), 1-methylcytosine (1-MeC) and 9-methyladenine (9-MeA), are shown below. For 5 -dCMP and 5 -dAMP, hatched areas correspond to unresolved energy regions in the PE spectra of the 1-MeC and 9-MeA. See refs. 14 and 31.

Electronegativity, defined as a measure of the tendency of an element to hold electrons when it forms a compound, is one of the more widely used concepts in chemistry. Mulliken defined the electronegativity of an atom as an average between the energy associated to the loss of an electron (ionization potential Ia)... 

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