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physics.atom-ph2020★ 26 cited
Precision Measurements in Few-Electron Molecules: The Ionization Energy of Metastable He and the First Rotational Interval of He
Luca Semeria, Paul Jansen, Gian-Marco Camenisch +3
Molecular helium represents a benchmark system for testing calculations on few-electron molecules. We report on the determination of the adiabatic ionization e…
physics.atom-ph2019★ 27 cited
Precision measurement of the ionization energy and quantum defects of 39K I
Michael Peper, Felix Helmrich, Jonas Butscher +4
We present absolute-frequency measurements in ultracold 39K samples of the transitions from the ground state to np Rydberg states. A global nonlinear regression of the np1/2 and np…
physics.atom-ph2019
Fluorescence-lifetime-limited trapping of Rydberg helium atoms on a chip
Valentina Zhelyazkova, Matija Žeško, Hansjürg Schmutz +2
Metastable (1s)(2s) helium atoms produced in a supersonic beam were excited to Rydberg-Stark states (with in the range) in a cryogenic environment and sub…