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A: Fachverband Atomphysik

A 27: Poster III

A 27.35: Poster

Donnerstag, 9. März 2023, 16:30–19:00, Empore Lichthof

Vanishing avoided crossings in Rydberg systems — •Matthew Eiles — Max Planck Institut für Physik komplexer Systeme, Dresden, Deutschland

The electronic potential energy curves describing a diatomic molecule repel one another rather than intersecting, as the conditions to find an exact crossing are not generically satisfied in a system depending on a single parameter. Diatomic long-range Rydberg molecules, however, provide an avenue to escape this restriction as their potential energy curves depend additionally on the principle quantum number of the Rydberg atom. Although this is not a continuous parameter, it can vary over such a wide range that it is possible to find nearly arbitrarily close avoided crossings, and with them, strong non-adiabatic coupling and the breakdown of the Born-Oppenheimer approximation. Here, we show several different ways that this behavior arises in Rydberg molecules and discuss its importance for their vibrational spectra.