Abstract
The ground-singlet state of an optical bipolaron in theregion of intermediate coupling strengths is analysed.It is shownthat the spatial structure of a bipolaron with intermediatecoupling strength is that of an axially symmetric quasi-moleculardimer.The bipolaron energies of coupling are determined for different couplingconstants and dielectric parameters of a medium.The electronic terms of the ground-dimer state are represented as afunction of the distance between quasi-particles.The intermediateregion of coupling constants is shown to give rise to anadditional specific term in the total energy,which depends on the dielectric properties of a medium and makesthe bipolaron energy of coupling higher (atε*/ε∞>1.06) or lower (atε*/ε∞<1.06) than the value in thelimit of adiabatic and strong coupling.
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