0000000000352334

AUTHOR

Ch. Illgner

showing 3 related works from this author

Radiation detected resonance ionization spectroscopy on208Tl and242fAm

1993

An ultra-sensitive laser spectroscopic method has been developed for the hyperfine spectroscopy of short-lived isotopes far off stability produced by heavy ion induced nuclear reactions at very weak intensity (> 1/s). It is based on resonance ionization spectroscopy in a buffer gas cell with radiation detection of the ionization process (RADRIS). As a first on-line application of RADRIS optical spectroscopy at242fAm fission isomers is in progress at the low target production rate of 10/s. The resonance ionization has been performed in two steps utilizing an excimer dye laser combination with a repetition rate of 300 Hz. The first resonant step proceeds through terms which correspond to wave…

Nuclear and High Energy PhysicsDye laserExcimer laserChemistrymedicine.medical_treatmentAnalytical chemistryResonanceCondensed Matter PhysicsAtomic and Molecular Physics and OpticsIon sourceAtmospheric-pressure laser ionizationIonizationmedicinePhysical and Theoretical ChemistryAtomic physicsSpectroscopyAmbient ionizationHyperfine Interactions
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Isotope shift and hyperfine structure measurements at the242f Am fission isomer

1996

Istope shift and hyperfine structure measurements have been performed for the242fAm fission isomer with target production rates of only a few per second. The method is based on resonance ionization spectroscopy (RIS) in a buffer gas cell with radioactive decay detection of the ionization process (RADRIS). A relative isotope shift ratioX exp=IS242f,241/ IS243,241=41.7±0.9 has been measured for the 500.02 nm transition corresponding to a nuclear parameter Λ242f,241=5.4±0.3 fm2. The analysis of the quadrupole moment based on the deformed Fermi-model of the nuclear charge distribution including second order corrections results inQ 20=38.2 ±1.4( −0.8 +0.4 )model eb. The measurement of the hyperf…

Nuclear and High Energy PhysicsIsotopeFissionChemistryCondensed Matter PhysicsAtomic and Molecular Physics and OpticsEffective nuclear chargeIsomeric shiftIsotopic shiftIonizationPhysical and Theoretical ChemistryAtomic physicsHyperfine structureRadioactive decayHyperfine Interactions
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First observation of a resonance ionization signal on242mAm fission isomers

1992

The feasibility of a hyperfine spectroscopy on242mAm fission isomers has been demonstrated at the low target production rate of 10/s. The experimental method employed is based on resonance ionization spectroscopy in a buffer gas cell with detection of the ionization process by means of the fission decay of the isomers. The resonance ionization has been performed in two steps, utilizing an excimer dye laser combination with a repetition rate of 300 Hz. The first resonant step proceeds through theJ=7/2 term at 21440.35 cm−1, which has been excited with the tuncable dye laser beam of a wavelength of 466.28 nm, the second non-resonant step is achieved with the 351 nm radiation of the excimer la…

Nuclear and High Energy PhysicsDye laserExcimer laserChemistrymedicine.medical_treatmentAnalytical chemistryPhysics::OpticsResonancePhotoionizationCondensed Matter PhysicsAtomic and Molecular Physics and OpticsAtmospheric-pressure laser ionizationIonizationPhysics::Atomic and Molecular ClustersmedicinePhysics::Atomic PhysicsPhysical and Theoretical ChemistryAtomic physicsSpectroscopyHyperfine structureHyperfine Interactions
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