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An interference asymmetry in the angular distribution of the Ly-α quenching radiation emitted by He + ions in the metastable 2s 1/2 state is measured to high precision to obtain the lifetime of the 2p 1/2 state. The derived lifetime of (0.997 17±0.00075) ×10 -10 s is the mostaccurate available for a fundamental atomic system. A detailed discussion of systematic corrections is included

physical review a

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>2<i>p</i>state lifetime by a quenching-asymmetry measurement

He+2pstate lifetime by a quenching-asymmetry measurement