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<i>F</i> -state quenching with CH <sub>4</sub> for buffer-gas cooled <sup>171</sup> Y b <sup>+</sup> frequency standard [Methane (CH4) for quenching the F-state in trapped Yb+ ions] [electronic resource].

Published
Arlington, Va. : United States. Defense Advanced Research Projects Agency, 2015.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
Article numbers 117,209 : digital, PDF file
Additional Creators
Sandia National Laboratories, United States. Defense Advanced Research Projects Agency, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
We report that methane, CH4, can be used as an efficient F-state quenching gas for trapped ytterbium ions. The quenching rate coefficient is measured to be (2.8 ± 0.3) × 106 s-1 Torr-1. For applications that use microwave hyperfine transitions of the ground-state 171Y b ions, the CH4 induced frequency shift coefficient and the decoherence rate coefficient are measured as δν/ν = (-3.6 ± 0.1) × 10-6 Torr-1 and 1/T2 = (1.5 ± 0.2) × 105 s-1 Torr-1. In our buffer-gas cooled 171Y b+ microwave clock system, we find that only ≤10-8 Torr of CH4 is required under normal operating conditions to efficiently clear the F-state and maintain ≥85% of trapped ions in the ground state with insignificant pressure shift and collisional decoherence of the clock resonance.
Report Numbers
E 1.99:sand--2015-5204j
sand--2015-5204j
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Note
Published through SciTech Connect.
11/01/2015.
"sand--2015-5204j"
"594436"
AIP Advances 5 11 ISSN 2158-3226 AM
Y. -Y. Jau; J. D. Hunker; P. D. D. Schwindt.
Funding Information
AC04-94AL85000
View MARC record | catkey: 24046126