| DOI | Resolve DOI: https://doi.org/10.1103/PhysRevLett.112.173002 |
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| Author | Search for: Dubé, P.1; Search for: Madej, A.A.1; Search for: Tibbo, M.1; Search for: Bernard, J.E.1 |
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| Affiliation | - National Research Council of Canada. Measurement Science and Standards
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| Format | Text, Article |
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| Subject | Antenna radiation; Electric fields; Frequency shift keying; Frequency standards; Polarization; Black body radiation; Dynamic correction; Field evaluation; High-accuracy measurements; Reference standard; Scalar polarizability; Shift coefficients; Total uncertainties; Ions |
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| Abstract | We report a high-accuracy measurement of the differential static scalar polarizability Δα0 of the 5sS1/22-4dD5/22 transition of the Sr+88 ion. The high accuracy is obtained by comparing the micromotion-induced positive scalar Stark shift to the negative time-dilation shift. Measurement of the trap drive frequency where these shifts cancel is used to determine Δα0 without the need to determine the electric field. Δα0 is a critical parameter for the operation of frequency standards as it determines the blackbody radiation frequency shift coefficient, the largest source of uncertainty in the Sr+88 ion clock. The measured value of Δα0 is -4.7938(71)×10-40Jm2/V2. Taking into account the dynamic correction, the blackbody shift at 300 K is 0.24799(37) Hz. The contribution of the blackbody shift coefficient to the uncertainty of the ion standard has been reduced by a factor of 24, from 2×10-17 to 8.3×10-19. The revised total uncertainty of our reference standard is 1.2×10-17, limited by the blackbody field evaluation. An additional benefit of the low uncertainty of Δα0 is the ability to suppress, by a factor of about 200, the net micromotion frequency shifts. © 2014 Published by the American Physical Society. |
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| Publication date | 2014 |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 21272226 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 2bc131ab-7cb8-4b94-85df-9cec7333bd8b |
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| Record created | 2014-07-23 |
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| Record modified | 2020-04-22 |
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