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- W2160937269 abstract "We report the first direct observation and high precision measurement of the triplet to singlet transition between the metastable states of helium. We obtain a precision of 8×10 <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>-12</sup> , providing a stringent test of two-electron quantum electrodynamic theory and of nuclear few-body theory. We use either the <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>4</sup> He or the <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>3</sup> He isotope, and from the isotope shift derive a new value for the <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>3</sup> He charge radius." @default.
- W2160937269 created "2016-06-24" @default.
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- W2160937269 date "2011-08-01" @default.
- W2160937269 modified "2023-09-27" @default.
- W2160937269 title "Frequency metrology in quantum degenerate helium" @default.
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- W2160937269 doi "https://doi.org/10.1109/iqec-cleo.2011.6194159" @default.
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