Auflistung nach Autor/in "7c57a536-d7b8-4a2d-bb0d-67b018419b5b"

Auflistung nach Autor/in "7c57a536-d7b8-4a2d-bb0d-67b018419b5b"

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  • Closed-cycle, low-vibration 4 K cryostat for ion traps and other applications 
    Micke, P.; Stark, J.; King, S.A.; Leopold, T.; Pfeifer, T.; Schmöger, L.; Schwarz, M.; Spieß, L.J.; Schmidt, P.O.; Crespo López-Urrutia, J.R. ([Erscheinungsort nicht ermittelbar] : American Institute of Physics, 2019)
    In vacuo cryogenic environments are ideal for applications requiring both low temperatures and extremely low particle densities. This enables reaching long storage and coherence times, for example, in ion traps, essential ...
  • Coulomb crystallization of highly charged ions 
    Schmöger, L.; Versolato, O.O.; Schwarz, M.; Kohnen, M.; Windberger, A.; Piest, B.; Feuchtenbeiner, S.; Pedregosa, J.; Leopold, T.; Micke, P.; Hansen, A.K.; Baumann, T.M.; Drewsen, M.; Ullrich, J.; Schmidt, Piet O.; Crespo López-Urrutia, J.R. (Bristol : IOP Publishing Ltd., 2015)
    Sympathetic Coulomb crystallization of highly charged ions, retrapped in a cryogenic radiofrequency trap, is demonstrated by an over seven orders-of-magnitude decrease in motional temperature.
  • Cryogenic linear Paul trap for cold highly charged ion experiments 
    Schwarz, M.; Versolato, O.O.; Windberger, A.; Brunner, F.R.; Ballance, T.; Eberle, S.N.; Ullrich, J.; Schmidt, Piet O.; Hansen, A.K.; Gingell, A.D.; Drewsen, M.; Crespo López-Urrutia, J.R. (College Park, MD : American Institute of Physics, 2012)
    Storage and cooling of highly charged ions require ultra-high vacuum levels obtainable by means of cryogenic methods. We have developed a linear Paul trap operating at 4 K capable of very long ion storage times of about ...
  • A cryogenic radio-frequency ion trap for quantum logic spectroscopy of highly charged ions 
    Leopold, T.; King, S.A.; Micke, P.; Bautista-Salvador, A.; Heip, J.C.; Ospelkaus, C.; Crespo López-Urrutia, J.R.; Schmidt, P.O. ([Erscheinungsort nicht ermittelbar] : American Institute of Physics, 2019)
    A cryogenic radio-frequency ion trap system designed for quantum logic spectroscopy of highly charged ions (HCI) is presented. It includes a segmented linear Paul trap, an in-vacuum imaging lens, and a helical resonator. ...
  • Deceleration, precooling, and multi-pass stopping of highly charged ions in Be+ Coulomb crystals 
    Schmöger, L.; Schwarz, M.; Baumann, T.M.; Versolato, O.O.; Piest, B.; Pfeifer, T.; Ullrich, J.; Schmidt, Piet O.; Crespo López-Urrutia, J.R. (College Park, MD : American Institute of Physics, 2015)
    Preparing highly charged ions (HCIs) in a cold and strongly localized state is of particular interest for frequency metrology and tests of possible spatial and temporal variations of the fine structure constant. Our versatile ...
  • Detection of the 5p – 4f orbital crossing and its optical clock transition in Pr9+ 
    Bekker, H.; Borschevsky, A.; Harman, Z.; Keitel, C.H.; Pfeifer, T.; Schmidt, P.O.; Crespo López-Urrutia, J.R.; Berengut, J.C. ([London] : Nature Publishing Group UK, 2019)
    Recent theoretical works have proposed atomic clocks based on narrow optical transitions in highly charged ions. The most interesting candidates for searches of physics beyond the Standard Model are those which occur at ...
  • Identification of the predicted 5s-4f level crossing optical lines with applications to metrology and searches for the variation of fundamental constants 
    Windberger, A.; Crespo López-Urrutia, J.R.; Bekker, H.; Oreshkina, N.S.; Berengut, J.C.; Bock, V.; Borschevsky, A.; Dzuba, V.A.; Eliav, E.; Harman, Z.; Kaldor, U.; Kaul, S.; Safronova, U.I.; Flambaum, V.V.; Keitel, C.H.; Schmidt, Piet O.; Ullrich, J.; Versolato, O.O. (College Park, MD : American Physical Society, 2015)
    We measure optical spectra of Nd-like W, Re, Os, Ir, and Pt ions of particular interest for studies of a possibly varying fine-structure constant. Exploiting characteristic energy scalings we identify the strongest lines, ...
  • An ultralow-noise superconducting radio-frequency ion trap for frequency metrology with highly charged ions 
    Stark, J.; Warnecke, C.; Bogen, S.; Chen, S.; Dijck, E.A.; Kühn, S.; Rosner, M.K.; Graf, A.; Nauta, J.; Oelmann, J.-H.; Schmöger, L.; Schwarz, M.; Liebert, D.; Spieß, L.J.; King, S.A.; Leopold, T.; Micke, P.; Schmidt, P.O.; Pfeifer, T.; Crespo López-Urrutia, J.R. ([Erscheinungsort nicht ermittelbar] : American Institute of Physics, 2021)
    We present a novel ultrastable superconducting radio-frequency (RF) ion trap realized as a combination of an RF cavity and a linear Paul trap. Its RF quadrupole mode at 34.52 MHz reaches a quality factor of Q ≈ 2.3 × 105 ...