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RESEARCH PRODUCT
Resonance lonization mass spectroscopy with a pulsed thermal atomic beam
St. BeckerH.-j. KlugeTh. HilberathC. SchulzU. Krönertsubject
Physics and Astronomy (miscellaneous)ChemistryGeneral EngineeringGeneral ChemistryPhotoionizationMass spectrometryLaserIonlaw.inventionlawDesorptionMass spectrumGeneral Materials ScienceDetectors and Experimental TechniquesAtomic physicsSpectroscopyExcitationdescription
Resonance ionization mass spectroscopy (RIMS) and pulsed-laser induced desorption (PLID) have been combined for ultrasensitive detection and spectroscopy of very small samples of refractive elements. The method has been tested and applied to laser spectroscopy of 5×109 atoms (1.5 pg) of195Au (T1/2= 183d) implanted at the ISOLDE online mass separator with 60 keV into graphite. A pulsed thermal atomic beam was formed by laser desorption with a 10 ns Nd∶Yag laser pulse. Subsequently the atoms were photoionized in a three-colour, three-step resonant excitation to an autoionizing state. The selectivity was enhanced by a time-of-flight measurement of the photo ions. In resonance, one ion was detected per 105 atoms implanted resulting in a gain in detection efficiency by three orders of magnitude in comparison to the use of a continuous atomic beam. In the course of the experiments several unknown autoionizing states were found, and the lifetime of the 6d2D3/2 state of gold was determined to beτ=10.7(6) ns.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1987-12-01 | Applied Physics A Solids and Surfaces |