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- W2276045557 abstract "Radiative lifetimes of four $^{1}S$ levels ($n=6ensuremath{-}9$) and seven $^{1}P$ levels ($n=7ensuremath{-}13$) of He I have been measured using the high-frequency deflection technique. The $^{1}S$ lifetimes, with estimated limiting errors of about 3-7%, agree well for $n=6ensuremath{-}8$ with theoretical lifetimes based on transition probabilities computed from central-field wave functions with exchange and configuration interaction. An apparent discrepancy between theory and experiment in the case of the $9^{1}S$ measurement is largely removed when blackbody-radiation-induced emission and absorption processes are included in the theoretical lifetime. Radiative lifetimes for the $^{1}P$ levels were determined under conditions where, in favorable cases ($n=8ensuremath{-}12$), the zero-pressure lifetimes differed by no more than 10-20% from the values measured at low pressures. In these cases, the estimated accuracy of the measurements is comparable to that of theory, and the agreement is deemed within the combined uncertainties. Quenching cross sections for the $n^{1}S$ levels are also reported." @default.
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- W2276045557 date "1983-12-01" @default.
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- W2276045557 title "Radiative lifetimes of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>S</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>and<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>P</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>1</…" @default.
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- W2276045557 doi "https://doi.org/10.1103/physreva.28.3371" @default.
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