0000000000387630

AUTHOR

I. Hoog

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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LASER SPECTROSCOPY WITH A COOLER RING AT THE ESR (GSI) AND THE TSR (MPI HEIDELBERG)

1992

At the TSR cooler ring at Heidelberg, laser studies were carried out using singly charged lithium and beryllium ions. Laser spectroscopy of relativistic lithium ions (v=0.04c) yielded signals with a narrow linewidth, suitable for an experimental test of special relativity. A dramatic reduction of the beam temperature, as defined by the longitudinal velocity spread, was achieved via laser cooling in both cases. At the ion energies available at ESR it will become possible to prepare and store bare ions up to U92+. Electron cooling was succesfully demonstrated for hydrogen-like Bi82+ ions, where a laser experiment is scheduled to study the ground-state hyperfine splitting.

Nuclear and High Energy PhysicsChemistryPhysics::Opticschemistry.chemical_elementCondensed Matter PhysicsLaserAtomic and Molecular Physics and Opticslaw.inventionIonLaser linewidthlawLaser coolingLithiumPhysics::Atomic PhysicsPhysical and Theoretical ChemistryAtomic physicsSpectroscopyHyperfine structureElectron cooling
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A laser desorption/resonance enhanced photoionisation TOF-system for the spatially resolved trace analysis of elements

2004

Abstract A novel method for direct and spatially resolved elemental trace analysis with high sensitivity and elemental selectivity is presented. The concept is based on the combination of a commercial MALDI-TOF mass spectrometer with a pulsed laser system for resonant postionisation of neutrals. While the MALDI method is usually applied for investigations of large organic compounds and biomolecules, the technique discussed here concerns the low mass range around 1 ⩽ A ⩽ 300. The analytical performances of the setup with respect to mass analysis, spatial resolution and overall detection efficiency are discussed.

MALDI imagingNuclear and High Energy PhysicsResolution (mass spectrometry)SpectrometerChemistryAnalytical chemistryResonancePhotoionizationMass spectrometryLaserlaw.inventionlawDesorptionInstrumentationNuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
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