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- W2051250438 abstract "We have measured the absolute frequency of the hydrogen $1Sensuremath{-}2S$ two-photon resonance with an accuracy of 3.4 parts in ${10}^{13}$ by comparing it with the $28mathrm{th}$ harmonic of a methane-stabilized $3.39ensuremath{mu}mathrm{m}$ He-Ne laser. A frequency mismatch of 2.1 THz at the $7mathrm{th}$ harmonic is bridged with a phase-locked chain of five optical frequency interval dividers. From the measured frequency ${f}_{1Sensuremath{-}2S}phantom{rule{0ex}{0ex}}=phantom{rule{0ex}{0ex}}2466061413187.34(84)mathrm{kHz}$ and published data of other authors we derive precise new values of the Rydberg constant, ${R}_{ensuremath{infty}}phantom{rule{0ex}{0ex}}=phantom{rule{0ex}{0ex}}10973731.568639(91){mathrm{m}}^{ensuremath{-}1}$ and of the Lamb shift of the $1S$ ground state, ${L}_{1S}phantom{rule{0ex}{0ex}}=phantom{rule{0ex}{0ex}}8172.876(29)mathrm{MHz}$. These are now the most accurate values available." @default.
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- W2051250438 date "1997-10-06" @default.
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- W2051250438 title "Phase-Coherent Measurement of the Hydrogen<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mn>1</mml:mn><mml:mi mathvariant=italic>S</mml:mi><mml:mo>−</mml:mo><mml:mn>2</mml:mn><mml:mi mathvariant=italic>S</mml:mi></mml:math>Transition Frequency with an Optical Frequency Interval Divider Chain" @default.
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- W2051250438 doi "https://doi.org/10.1103/physrevlett.79.2646" @default.
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