Abstract
A simple analytical formula for the entire van der Waals potential of the He-Ne dimer is derived. The short range repulsive part is essentially from the surface integral theory with the parameters calculated by a combining rule. The long range attractive potential is described by the damped asymptotic dispersion series. The potential depends only on the known dispersion coefficients and the amplitude of the asymptotic wave function and the ionization energy of the atoms. Without any adjustable parameters the HeNe potential predicted with the present formula is in excellent agreement with the accurate experimental and theoretical results around the equilibrium distance and long range distances. The same method also can be applied to other heteronuclear dimers.
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