Decay rate of the $2 {}^{2}S_{\frac{1}{2}}$ state of singly ionized helium

Publisher Website

1 February 1978

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

Vol. 17 (2) , 670-676
https://doi.org/10.1103/physreva.17.670

Abstract

A precise measurement has been made of the lifetime of

{He}^{+}

in the metastable

2 {}^{2}S_{\frac{1}{2}}

state. The result,

Γ_{2 S} = 525 \pm 5

\sec^{- 1}

, is consistent with the theory of spontaneous two-photon decay and places an upper limit

| δ | < 2.4 \times 10^{- 5}

on the amplitude of any parity-nonconserving

2 P

admixture.

Keywords

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