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- W2340650291 abstract "Laser spectroscopy has been performed on a beam of neutral $^{4}mathrm{He}$ atoms. By using transverse laser cooling and focusing, we are able to prepare a bright beam of atoms in the metastable state $2phantom{rule{0.16em}{0ex}}{}^{3}{S}_{1}$ deflected from the original effusive atomic beam. The initial state preparation is completed with optical pumping on the $2phantom{rule{0.16em}{0ex}}{}^{3}{P}_{1}ensuremath{leftarrow}2phantom{rule{0.16em}{0ex}}{}^{3}{S}_{1}$ transition at the wavelength of 1083 nm, followed by laser spectroscopy on the $2phantom{rule{0.16em}{0ex}}{}^{3}{P}_{1,2}ensuremath{leftarrow}2phantom{rule{0.16em}{0ex}}{}^{3}{S}_{1}$ transitions. The $2phantom{rule{0.16em}{0ex}}{}^{3}{P}_{1}ensuremath{-}2phantom{rule{0.16em}{0ex}}{}^{3}{P}_{2}$ fine-structure splitting is determined to be $2phantom{rule{0.16em}{0ex}}291phantom{rule{0.16em}{0ex}}177.69ifmmodepmelsetextpmfi{}0.36phantom{rule{0.16em}{0ex}}mathrm{kHz}$. The quantum interference effect is included in data extraction. This is the most precise laser spectroscopy measurement of the interval. Our result is in agreement with both the latest QED-based calculation and the most precise measurement conducted with microwave spectroscopy." @default.
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- W2340650291 date "2015-03-23" @default.
- W2340650291 modified "2023-10-17" @default.
- W2340650291 title "Laser-spectroscopy measurement of the fine-structure splitting23P1–23P2ofHe4" @default.
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- W2340650291 doi "https://doi.org/10.1103/physreva.91.030502" @default.
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