Matches in SemOpenAlex for { <https://semopenalex.org/work/W1577254313> ?p ?o ?g. }
- W1577254313 abstract "We have measured the absolute frequency of a clock transition at the 10${}^{ensuremath{-}15}$ level with a single, trapped, laser-cooled ${}^{40}$Ca${}^{+}$ ion in a miniature Paul trap. In our measurement, an optical frequency comb is referenced to a hydrogen maser, which is calibrated to the SI second through the Global Positioning System (GPS). By analyzing the experimental data obtained within 32 days of a total averaging time $>$2 $ifmmodetimeselsetexttimesfi{}$ 10${}^{6}$ s, the absolute frequency of the ${}^{40}$Ca${}^{+}$ 4$s$ ${}^{2}phantom{rule{-0.16em}{0ex}}{S}_{1/2}$--3$d$ ${}^{2}phantom{rule{-0.16em}{0ex}}{D}_{5/2}$ clock transition is measured as 411 042 129 776 393.0 (1.6) Hz with a fractional uncertainty of 3.9 $ifmmodetimeselsetexttimesfi{}$ 10${}^{ensuremath{-}15}$." @default.
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- W1577254313 date "2012-03-23" @default.
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- W1577254313 title "Hertz-level measurement of the<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msup><mml:mrow /><mml:mn>40</mml:mn></mml:msup></mml:math>Ca<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msup><mml:mrow /><mml:mo>+</mml:mo></mml:msup></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mn>4</mml:mn><mml:mi>s</mml:mi></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/…" @default.
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- W1577254313 doi "https://doi.org/10.1103/physreva.85.030503" @default.
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