Abstract

The single atom counting rate of a rare isotope and the loading rate of another stable isotope with an abundance over 10 orders of magnitude larger are measured in one atom trap. The linear correlation between the measured counting/loading rates is examined to determine the Kr84/Kr82 and Kr85/Kr83 ratios of a Kr gas sample. Experiments show that the relative uncertainty is reduced to 1.3% when the single atom counting rate of Kr85 is normalized by the measured Kr83 loading rate. The measurement of the normalized single atom counting rate can be used to determine extremely low (10โˆ’16โ€“10โˆ’11) isotope abundance. This normalization method is robust and can also be applied in other atomic systems.

© 2012 Optical Society of America

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