Ionization energies influencing factors

Ionization energies should depend on the effective nuclear charge that holds the electrons in the atom. Calculate Z (Slater s rules) for N, P, and As. Do their ionization energies seem to match these effective nuclear charges If not, what other factors influence the ionization energies ... 

To recapitulate all factors influencing photo yield, one can conceptualize the photoemission process in two sequential steps. First is the operation of a photoconductor, which includes photoabsorption efficiency plus electron transport efficiency through the bulk of the photoemissive layer to the surface. Second is the surface emission process, which includes all factors enhancing escape once the carrier reaches the surfaee. In particular this includes rejection of all electrons excited with energy lower than the ionization energy , i.e., with energy below the surface-barrier energy. 

In general, the smaller atoms have higher ionization energies. The same factors that influence atomic size also influence ionization energies. The energy needed to remove an electron from the outer shell depends on both the effective... 

In 2 computational aspects are discussed, with the assessment of DFT methods ( 2.1) in the evaluation of (a) ionization energies and electron affinities, and via eqn. (11), finite difference estimates of electronegativities and hardnesses ( 2.1.1) Mid (b) of dipole and quadrupole moments ( 2.1.2).In the final paragraph 2.2 a problem at the borderline between computational and conceptual DFT is tackled the evaluation of Fukui fimctions "beyond" the finite difference approximation. In 3 conceptual DFT is discussed, where in 3.1 attention is paid to the evaluation and/or use of DFT based concepts as such the shape factor and the local softness as Molecular Similarity indicators ( 3.1.1), and the nuclear Fukui function ( 3.1.2). In the final part of this Section ( 3.2) the role of DFT based concepts in various principles is discussed. The influence of solvent on the acidity of alkylalcohols is discussed within the framework of Sanderson s Electron ativity Equalization Principle [30] ( 3.2.1). The Hard and Soft Acids and Bases Principle and Pearson s Maximum Hardness Principle [31] are used as the guiding prindples in the study of the cycloaddition reactions of HNC to alkenes and aligmes. 

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