Hannover 2010 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 8: Poster

MS 8.10: Poster

Donnerstag, 11. März 2010, 16:00–18:00, Lichthof

Novel techniques for laser ionization at the IGISOL facility - an inductively-heated RF hot cavity and the gas jet method — •Volker Sonnenschein, Iain Moore, Mikael Reponen, and Juha Äystö — University of Jyväskylä, Finland

Experiments have revealed a (21+) isomeric state in 94Ag. Recently the observed decay modes, including a two proton decay, have been brought into question. For further investigation an inductively-heated hot cavity designed to operate at temperatures of up to 2300 K has been developed at JYFL for the production of radioactive silver ion beams. An efficient laser ionization scheme for silver has already been tested, though a further search for autoionizing states using a grating-based Ti:Sapphire laser is planned.

The SPIG (Sextupole Ion Guide) allows for element selective ionization of the on-line produced radioactive species at IGISOL by using resonant laser ionization of atoms in an expanding gas jet and trapping the produced ions by RF fields. Visualization of the jet by a DC discharge showed a large angular spread of the gas jet, which would result in a poor overlap geometry between the atoms and the counterpropagating laser beams. Offline studies of the gas flow as a function of nozzle design, gas cell pressure and background extraction chamber pressure have been carried out. The velocity of the jet has been probed using resonance ionization spectroscopy of nickel atoms evaporated from a filament. A clear shift in the resonance centroid compared to ionization in the gas cell indicates a supersonic jet expansion.

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DPG-Physik > DPG-Verhandlungen > 2010 > Hannover