Journal
OPTICS EXPRESS
Volume 20, Issue 19, Pages 21379-21384Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.20.021379
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Funding
- National Research Foundation
- Ministry of Education of Singapore
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We present precision measurements of the hyperfine intervals in the 5D(3/2) manifold of a single trapped Barium ion, Ba-137(+). Measurements of the hyperfine intervals are made between m(F) = 0 sublevels over a range of magnetic fields allowing us to interpolate to the zero field values with an accuracy below a few Hz, an improvement on previous measurements by three orders of magnitude. Our results, in conjunction with theoretical calculations, provide a 30-fold reduction in the uncertainty of the magnetic dipole (A) and electric quadrupole (B) hyperfine constants. In addition, we obtain the magnetic octupole constant (C) with an accuracy below 0.1Hz. This gives a subsequent determination of the nuclear magnetic octupole moment, Omega, with an uncertainty of 1% limited almost completely by the accuracy of theoretical calculations. This constitutes the first observation of the octupole moment in Ba-137(+) and the most accurately determined octupole moment to date. (C) 2012 Optical Society of America
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