Exploring the vibrational series of pure trilobite Rydberg molecules

Max Althön, Markus Exner, Richard Blättner and Herwig Ott ()
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Max Althön: Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau
Markus Exner: Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau
Richard Blättner: Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau
Herwig Ott: Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: Abstract In trilobite Rydberg molecules, an atom in the ground state is bound by electron-atom scattering to a Rydberg electron that is in a superposition of high angular momentum states. This results in a homonuclear molecule with a permanent electric dipole moment in the kilo-debye range. Trilobite molecules have previously been observed only with admixtures of low-l states. Here we report on the observation of two vibrational series of pure trilobite Rubidium-Rydberg molecules that are nearly equidistant. They are produced by three-photon photoassociation and lie energetically more than 15 GHz below the atomic 22F state of rubidium. We show that these states can be used to measure the electron-atom scattering length at low energies in order to benchmark current theoretical calculations. In addition to measuring their kilo-Debye dipole moments, we also show that the molecular lifetime is increased compared to the 22F state due to the high-l character. The observation of an equidistant series of vibrational states opens the way to observe coherent molecular wave packet dynamics.

Date: 2023
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DOI: 10.1038/s41467-023-43818-7

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