AIP Digital Archive
Electrical Engineering, Measurement and Control Technology
Laser resonance ionization has been applied to ionize radioactive atoms released from thick ISOLDE/CERN targets. Laser light from pulsed dye lasers with a high repetition rate (10 kHz) was used for stepwise excitation and ionization. By this method, efficiency as well as the selectivity of the target/ion source system could be improved. In a series of off-line and on-line studies, the resonance ionization of elements with different ionization potentials, such as Yb (Ei=6.2 eV), Tm (Ei=5.8 eV) and Sn (Ei=7.3 eV), was investigated. For Yb, photoionization efficiencies of up to 15% have been measured. An efficiency of 0.2% was obtained for Sn at the on-line separator ISOLDE-3. However, this value can be improved by about two orders of magnitude using a transition to an autoionizing state at 59 375.9 cm−1.
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