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- W2001231631 abstract "We have measured the forbidden $2text{ }^{3}{S}_{1}ensuremath{rightarrow}2text{ }^{1}{P}_{1}$ transition at 887 nm in a quantum degenerate gas of metastable $^{4}mathrm{He}$ atoms confined in an optical dipole trap. The determined transition frequency is 338 133 594.4 (0.5) MHz, from which we obtain an ionization energy of the $2text{ }^{1}{P}_{1}$ state of 814 709 148.6 (0.5) MHz. This ionization energy is in disagreement by $>3ensuremath{sigma}$ with the most accurate quantum electrodynamics calculations available. Our measurements also provide a new determination of the lifetime of the $2text{ }^{1}{P}_{1}$ state of $0.551text{ }(0.004{)}_{text{stat}}text{ }{(}_{ensuremath{-}0.000}^{+0.013}{)}_{text{syst}}text{ }text{ }mathrm{ns}$, which is the most accurate determination to date and in excellent agreement with theory." @default.
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- W2001231631 date "2014-06-25" @default.
- W2001231631 modified "2023-09-23" @default.
- W2001231631 title "High-Precision Spectroscopy of the Forbidden<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mn>2</mml:mn><mml:mtext> </mml:mtext><mml:mmultiscripts><mml:mrow><mml:msub><mml:mrow><mml:mi>S</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:mmultiscripts><mml:mo stretchy=false>→</mml:mo><mml:mn>2</mml:mn><mml:mtext> </mml:mtext><mml:mmultiscripts><mml…" @default.
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- W2001231631 doi "https://doi.org/10.1103/physrevlett.112.253002" @default.
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