Abstract

The hyperfine structure of the $4d^2{D}_{3/\mathrm{2,5}/2}$ levels of ${ }^{\mathrm{69,71}}\mathrm{Ga}$ is determined. The $4p^2{P}_{3/2}\to 4d^2{D}_{3/2}$ (294.50-nm) and $4p^2{P}_{3/2}\to 4d^2{D}_{5/2}$ (294.45-nm) transitions are studied by laser-induced fluorescence in an atomic Ga beam. The hyperfine A constant measured for the $4d^2{D}_{5/2}$ level is $77.3\pm 0.9$ MHz for ${ }^{69}\mathrm{Ga}$ and $97.9\pm 0.7$ MHz for ${ }^{71}\mathrm{Ga}$ (3σ errors). The A constant measured for the $4d^2{D}_{3/2}$ level is $-36.3\pm 2.2$ MHz for ${ }^{69}\mathrm{Ga}$ and $-46.2\pm 3.8$ MHz for ${ }^{71}\mathrm{Ga}.$ These measurements correct sign errors in the previous determination of these constants. For ${ }^{69}\mathrm{Ga}$ the hyperfine B constants measured for the $4d^2{D}_{5/2}$ and the $4d^2{D}_{3/2}$ levels are $5.3\pm 4.1$ MHz and $4.6\pm 4.2$ MHz, respectively. The isotope shift is determined to be $114\pm 8$ MHz for the $4p^2{P}_{3/2}\to 4d^2{D}_{3/2}$ transition and $115\pm 7$ MHz for the $4p^2{P}_{3/2}\to 4d^2{D}_{5/2}$ transition. The lines of ${ }^{71}\mathrm{Ga}$ are shifted to the blue. This is in agreement with previous measurement.

© 2001 Optical Society of America

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