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A two-step, two-color laser spectroscopy technique has been used to measurethe hyperfine splittings of the $8p$ excited states in $^{203}$Tl and$^{205}$Tl, as well as the $7s - 8p$ transition isotope shifts. For the case ofthe $8p_{3/2}$ state, our results show a hyperfine anomaly consistent with ourrecent measurements of other hyperfine splittings, and in disagreement witholder results for this state. Our measurement of the $8p_{1/2}$ isotope shiftis also in disagreement with earlier work. In this series of experiments, a UVlaser was locked to the first-step transition and directed through a heatedvapor cell, while a second spatially overlapping red laser was scanned acrossthe two second-step transitions. To facilitate accurate frequency calibration,radio-frequency modulation of the second-step laser was used to createsidebands in the Doppler-free absorption spectrum.

Measurement of hyperfine splittings and isotope shifts in the $8p$ excited states of $^{205}$Tl and $^{203}$Tl using two-step laser spectroscopy