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A: Fachverband Atomphysik
A 29: Ultra-cold plasmas and Rydberg systems III (joint session A/Q)
A 29.4: Vortrag
Freitag, 13. März 2020, 12:00–12:15, b305
Precision Spectroscopy of Negative-Ion Resonances in Ultralong-Range Rydberg Molecules — •Thomas Dieterle1, Felix Engel1, Frederic Hummel2, Christian Fey4, Peter Schmelcher2,3, Robert Löw1, Tilman Pfau1, and Florian Meinert1 — 15. Physikalisches Institut and Center for Integrated Quantum Science and Technology IQST, Universität Stuttgart — 2Zentrum für optische Quantentechnologien, Fachbereich Physik, Universität Hamburg — 3The Hamburg Centre for Ultrafast Imaging, Universität Hamburg — 4Max-Planck-Institute of Quantum Optics, Garching
Negative ions constitute remarkable objects that, in contrast to their neutral relatives, are very weakly bound and typically feature only few bound states. Moreover, the level structure of negative ions near the electron detachment limit also dictates the low-energy scattering of an electron with the parent neutral atom.
Here, we demonstrate how ultralong-range Rydberg molecules (ULRM) can be used as an atomic-scale system to precisely probe details of the underlying near-threshold anion states. For the first time, we present measurements of the so-far unobserved fine structure of the 3PJ triplet of Rb−. In addition, these measurements allow us to extract s- and p-wave scattering lengths with unprecedented precision and determine the positions of the p-wave shape resonances associated with the 3PJ fine-structure triplet of Rb−.