Abstract
The integral Hellmann–Feynman formula is applied to study the energy differences involved in the processes He→H2H− and Be→LiH→Li−. The energy differences are computed using single determinant SCF wavefunctions to represent the states. The transition density is reduced to diagonal form by means of a corresponding orbital transformation and each term in the energy expressions for the Be→LiH→Li− process is given a physical interpretation in terms of classical electrostatic concepts. A qualitative discussion is given which indicates a simple model might readily account for all factors contributing to the energy difference.
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