Counting individual 41Ca atoms with a magneto-optical trap

Details Counting individual 41Ca atoms with a magneto-optical trap Counting individual 41Ca atoms with a magneto-optical trap

2003-10-09

arxiv.org/abs/physics/0310045v1

Physics

Atomic Physics

Scientific paper

10.1103/PhysRevLett.92.153002

Atom Trap Trace Analysis (ATTA), a novel method based upon laser trapping and cooling, is used to count individual atoms of 41Ca present in biomedical samples with isotopic abundance levels between 10^-8 and 10^-10. ATTA is calibrated against Resonance Ionization Mass Spectrometry, demonstrating a good agreement between the two methods. The present ATTA system has a counting efficiency of 2x10^-7. Within one hour of observation time, its 3-sigma detection limit on the isotopic abundance of 41Ca reaches 4.5x10^-10.

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