Abstract
A new method of isobar separation by using doubly charged molecular ions has been discovered. BeO 2+ and LiO 2+ were studied in some detail using accelerator mass spectrometry (AMS). It was found that BeO 2+ is readily formed. About 1.85% (not yet optimized) of 1.46 MeV BeO − could be transformed into BeO 2+ after stripping by very low pressure argon gas at the central electrode of the tandem accelerator. In contrast to the ease of observation of BeO 2+, LiO 2+ was not observed, so that the isobars 7Be and 7Li can in principle be separated in this way. This discovery will be developed further and used to investigate the application of low-energy AMS to the detection of 7Be. The separation of the isobars of K and Ca using the same method was also tried. However, the results show that both KO and CaO form currents of doubly charged ions.
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