Abstract
The ground-state wave function and the energy term of a relativistic electron moving in the field of two fixed centers, when interaction of this particle with centers is described by two Coulomb and two Coulomb-like scalar potentials are calculated analytically by the linear combination of atomic orbitals method. By means of perturbation theory the asymptotic expansions (at small and large internuclear distances $R$) of the eigenvalues $E(R)$ of the system for arbitrary states are obtained. The dependence of critical charge ${Z}_{\text{cr}}$ and critical distance ${R}_{\text{cr}}$ from the scalar coupling constant was investigated.
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