SAMOP 2023 – scientific programme

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A: Fachverband Atomphysik

A 28: Ultra-cold Plasmas and Rydberg Systems II (joint session A/Q)

A 28.2: Talk

Friday, March 10, 2023, 11:30–11:45, F107

Resonance lineshapes in Rydberg atom - ion interactions — •Neethu Abraham and Matthew T Eiles — Max-Planck-Institut für Physik komplexer Systeme, Dresden, Germany

Rydberg molecules, ranging from the so-called "trilobite" molecules to Rydberg macrodimers to Rydberg atom-ion molecules, are a stunning highlight of recent experimental progress in ultracold atomic physics. Various factors can contribute to the decay of such molecules, including radiative decay or associative ionization. One non-radiative mechanism is the non-adiabatic coupling between electronic potential energy curves. We investigate this mechanism here in the Rydberg-ion molecule system using the streamlined version of the R-matrix method to compute the resonant line shapes. We provide a detailed analysis of the profiles and widths of these resonances and characterize them using the Fano-Feshbach lineshape. This shows how non-adiabatic coupling shifts the resonance positions away from the binding energies predicted in the Born-Oppenheimer approximation, and indicates the lifetimes of these states with regard to non-adiabatic decay. We explore these resonances over a range of different principal quantum numbers. Such a study can be relevant to the other types of Rydberg molecules as well.