Bulletin of the American Physical Society
54th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 68, Number 7
Monday–Friday, June 5–9, 2023; Spokane, Washington
Session V01: Poster Session III (4:00pm-6:00pm, PT)
4:00 PM,
Thursday, June 8, 2023
Room: Exhibit Hall C
Abstract: V01.00086 : The effects of nonadiabatic physics in long-range Rydberg molecules
Presenter:
Matthew T Eiles
(Max Planck Institute for the Physics of Complex Systems)
Authors:
Matthew T Eiles
(Max Planck Institute for the Physics of Complex Systems)
Frederic Hummel
(Max Plack Institute for Physics of Complex Systems)
Neethu Abraham
(Max Planck Institute for the Physics of Complex Systems)
Peter Schmelcher
(University of Hamburg)
Ultralong-range Rydberg molecules provide an exciting testbed for molecular physics at exaggerated scales. In the so-called trilobite and butterfly Rydberg molecules, the Born-Oppenheimer approximation can fail due to strong nonadiabatic couplings arising from the combination of radial oscillations and rapid energy variations in the adiabatic potential energy curves. We utilize an accurate coupled-channel treatment of the vibronic system to observe the breakdown of Born-Oppenheimer physics, such as nonadiabatic trapping and decay of molecular states found in the vicinity of pronounced avoided crossings in the adiabatic potential curves. Furthermore, we see how nonadiabatic couplings in a second Rydberg system, a long-range charged molecular ion, contribute to its dissociative decay. Using the same coupled channel treatment developed for the trilobite molecules in addition to an eigenchannel R-matrix approach, we calculate the scattering matrices governing the dissociation and resulting lifetimes. Our results indicate the importance of including nonadiabatic physics in the description of Rydberg molecules and in the interpretation of measured vibronic spectra and lifetimes.
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