$g_{J}$ Factor of the Lowest ${}^{1}P_{1}$ and ${}^{3}P_{1}$ States of Ba; Level-Crossing Determination of $\frac{A ({}^{1}P_{1})}{μ_{0} g_{J} ({}^{1}P_{1})}$ of ${Hg}^{199}$

The

g_{J} ({}^{3}P_{1})

and

g_{J} ({}^{1}P_{1})

factors of the (

6 s 6 p

) configuration in barium have been determined in a double-resonance experiment. The ratio

\frac{A ({}^{1}P_{1})}{[μ_{0} g_{J} ({}^{1}P_{1})]}

of the (

6 s 6 p

) configuration in

{Hg}^{199}

has been measured in a level-crossing experiment. The results are:

g_{J} ({}^{1}P_{1}, Ba) = 1.0039 \pm 0.0008

g_{J} ({}^{3}P_{1}, Ba) = 1.4973 \pm 0.0007

- \frac{h A ({}^{1}P_{1}, {Hg}^{199})}{[μ_{0} g_{J} ({}^{1}P_{1}, {Hg}^{199})]} = 2523.0 \pm 3.0

G. From the values of

A ({}^{1}P_{1}, {Hg}^{199})

obtained from optical spectroscopy, a value of

g_{J} ({}^{1}P_{1}, Hg)

is derived:

g_{J} ({}^{1}P_{1}, Hg) = 1.0127 \pm 0.0050

. We have summarized all lifetime and

g_{J}

values for the first excited

sp

configuration of the group-II...

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gJFactor of the LowestP11andP13States of Ba; Level-Crossing Determination ofA(P11)μ0gJ(P11)ofHg199