Influence of chemical substitution on carbon 1s electrons

Abstract
Inner-electron energies have been calculated for several ionic states of an isolated carbon atom, and for its neutral valence state. Both ‘sudden’ and ‘adiabatic’ approximations have been applied within the monocentric model in order to obtain 1s-electron ionization potentials. These results are used in conjunction with recent LCAO-MO-SCF computations by Allen and Ha to estimate net charges on the carbon atoms in the series CH4-n F n . A linear relationship is found between the ionization potential and net charge, and also between the ionization potential and number of fluorine atoms. Total molecular dipole moments calculated from these net charges are surprisingly good, much better than when a Mulliken population analysis estimate is made.