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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 Schmelcher^2,3, 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 ³P_J 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 ³P_J fine-structure triplet of Rb⁻.