$g_{J}$ Factor of an Ion: Determination of $\frac{g_{J} ({}^{4}{He}^{+}, 1 S_{\frac{1}{2}})}{g_{J} ({He}, 2 S_{1})}$

A measurement of the

g_{J}

factor of the hydrogenlike ion

{}^{4}{He}^{+}

in its

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

ground state has been made using an optical pumping technique. This represents the first precision measurement of the

g_{J}

factor of a simple atomic ion. The result is

\frac{g_{J} ({}^{4}{He}^{+}, 1 {}^{2}S_{\frac{1}{2}})}{g (e^{-})} = 1 - 70.87 (30) \times 10^{- 6}

. This value agrees with theory and provides confirmation of the Breit term

\frac{1}{3} {(Z α)}^{2}

to within 0.5%.

This publication has 7 references indexed in Scilit:

gJFactor of an Ion: Determination ofgJ(He+4,1S122)gJ(He4,2S13)