Abstract

A simple model potential is used to describe the interaction of a valence electron with the alkali core, which has the correct asymptotic form with the Coulomb and dipolar polarizability terms, and an effective hard-core radius adjusted to give the correct energy for the valence electron. Based on this potential, some simple wave functions are developed to describe the (Na, K, Rb, Cs)–H molecules, which incorporate some important local properties, in particular the cusp property when two charged particles are close to each other. These wave functions provide reliable values for the potential, and a simple physical perspective of their structure.

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