0000000000387631

AUTHOR

Matthias Weidemüller

showing 3 related works from this author

Toward a New Test of the Relativistic Time Dilation Factor by Laser Spectroscopy of Fast Ions in a Storage Ring

2003

The frequency measurement of Doppler-shifted optical lines of ions circulating in a storage ring at high speed permits a sensitive test of the relativistic Doppler-formula and, hence, the time dilation factor γSR of special relativity. Previous measurements at the storage ring TSR with 7Li+ at v = 0.065c gave a new, improved limit, but were hampered by the large observed linewidth, exceeding the natural width 15-fold. Recently we have identified the broadening to be caused by velocity-changing processes in the storage ring. Saturation spectroscopy has proven to be largely immune against these effects and has yielded linewidths only a few MHz larger than the natural one. This is the major in…

PhysicsNuclear and High Energy PhysicsCondensed Matter PhysicsAtomic and Molecular Physics and OpticsCharged particleIonLaser linewidthTheory of relativityTime dilationPhysical and Theoretical ChemistryAtomic physicsSaturation (chemistry)SpectroscopyStorage ringHyperfine Interactions
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HITRAP – a facility for experiments on heavy highly charged ions and on antiprotons

2009

HITRAP is a facility for very slow highly-charged heavy ions at GSI. HITRAP uses the GSI relativistic ion beams, the Experimental Storage Ring ESR for electron cooling and deceleration to 4 MeV/u, and consists of a combination of an interdigital H-mode (IH) structure with a radiofrequency quadrupole structure for further deceleration to 6 keV/u, and a Penning trap for accumulation and cooling to low temperatures. Finally, ion beams with low emittance will be delivered to a large variety of atomic and nuclear physics experiments. Presently, HITRAP is in the commissioning phase. The deceleration of heavy-ion beam from the ESR storage ring to an energy of 500 keV/u with the IH structure has be…

PhysicsHistoryLow emittancePenning trapComputer Science ApplicationsEducationIonlaw.inventionNuclear physicslawAntiprotonQuadrupolePhysics::Accelerator PhysicsPhysics::Atomic PhysicsAtomic physicsNuclear ExperimentBeam (structure)Storage ringElectron coolingJournal of Physics: Conference Series
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Spectroscopy of an ultracold Rydberg gas and signatures of Rydberg–Rydberg interactions

2005

We report on experiments on Rydberg–Rydberg interaction-induced effects in a gas of 87Rb Rydberg atoms. A compact setup for two-photon continuous-wave excitation of high-lying Rydberg states out of an ultracold atomic gas is presented. The performance of the apparatus is characterized by high-resolution spectroscopy of Rydberg states. Signatures of interaction-induced effects are identified by qualitatively analysing the dependence of Rydberg excitation spectra on the intensity and the duration of the second-step laser excitation.

PhysicsQuantum PhysicsCondensed Matter PhysicsLaserAtomic and Molecular Physics and Opticslaw.inventionsymbols.namesakelawUltracold atomExcited stateRydberg atomsymbolsRydberg formulaRydberg matterPhysics::Atomic PhysicsAtomic physicsSpectroscopyExcitationJournal of Physics B: Atomic, Molecular and Optical Physics
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