Abstract
Electrostatic multipole interactions generate long-range Rydberg–Rydberg macrodimers. We calculate the adiabatic potentials of cesium Rydberg macrodimers for principal quantum numbers n ranging from 56 to 62, for J = 3/2 and 5/2, and for the allowed values of the conserved sum of the atomic angular-momentum components along the internuclear axis, M. For most combinations (n, M, J) exactly one binding potential exists, which should give rise to Rydberg macrodimer states. We study the dependence of the adiabatic potentials on the size of the two-body basis sets used in the calculation, and on the maximal order, qmax, of the multipole terms included in the calculation. We determine the binding energies and lengths of the binding adiabatic potentials, investigate their scaling behaviors as a function of the effective principal quantum number, and discuss vibrational-state wave functions. We consider the applicability of the calculated potentials and excitation rates to an experimental scheme for preparing Rydberg-atom macrodimers using two-color double-resonant photoassociation.
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