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A chemically selective laser ion source for on‐line mass separation

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9 Author(s)
Scheerer, F. ; Institut für Physik, Universität Mainz, W‐6500 Mainz, Germany ; Fedoseyev, V.N. ; Kluge, H.-J. ; Mishin, V.I.
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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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Review of Scientific Instruments  (Volume:63 ,  Issue: 4 )