Abstract

An ultrahigh vacuum `trapped ion source' has been developed following closely Redhead's basic design. 1) Positive ions have been trapped within the space charge of a magnetically confined electron beam with potential barriers at either end of the ionization region, resulting in the production of multiply charged ions. These highly stripped ions are formed by the successive collisions with low energy (\\leqslant250 eV) electrons and detected by means of a built in 5 cm radius, 180° mass spectrometer. The results obtained in the production of multiply charged ions of Au are presented.

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