Precision measurement of the branching fractions of the 5p(2)P(1/2) state in Sr-88(+) with a single ion in a microfabricated surface trap

摘要

We measured the branching fractions for the decay of the 5p(2)P(1/2) state of Sr-88(+) by applying a recently demonstrated photon-counting sequential method [M. Ramm, T. Pruttivarasin, M. Kokish, I. Talukdar, and H. Haffner, Phys. Rev. Lett. 111, 023004 (2013)] to a single ion laser cooled in a microfabricated surface trap. The branching fraction for the decay into the 5s(2)S(1/2) ground level was found to be p = 0.9449(5). This result is in good agreement with recent theoretical calculations but disagrees with previous experimental measurements, however affected by a one-order-of-magnitude larger uncertainty. This experiment demonstrates that microtrap technology is also applicable in the domain of precision measurements and spectroscopy.