Lifetime of the $2 {}^{1}P_{1}$ and $3 {}^{1}P_{1}$ States of Atomic Helium

1 January 1971

journal article
research article
Published by American Physical Society (APS) in Physical Review A

Vol. 3 (1) , 64-75
https://doi.org/10.1103/physreva.3.64

Abstract

The radiative lifetime of the

2 {}^{1}P_{1}

and

3 {}^{1}P_{1}

state of atomic helium has been measured by the level-crossing technique. In the experiment, a beam of

2 {}^{1}S_{0}

metastable atoms was first produced and then excited to the

2 {}^{1}P_{1}

3 {}^{1}P_{1}

state with resonance radiation. The lifetimes were measured by observing the zero-field level-crossing signals in the detected 584- or 537-Å fluorescent radiation when these

{}^{1}P_{1}

states decayed to the

1 {}^{1}S_{0}

ground state. The results are

τ (2 {}^{1}P_{1}) = (5.57 \pm 0.15) \times 10^{- 10}

sec and

τ (3 {}^{1}P_{1}) = (1.73 \pm 0.11) \times 10^{- 9}

sec. These values are in excellent agreement with theory.

Keywords

This publication has 30 references indexed in Scilit:

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Lifetime of the2P11and3P11States of Atomic Helium

Abstract

Keywords

Lifetime of the $2 {}^{1}P_{1}$ and $3 {}^{1}P_{1}$ States of Atomic Helium