Abstract
We have measured the hyperfine splitting and level isotope shifts (LIS) of the (6s6p{sup 2}) {sup 4}P{sub 1/2} level of {sup 205}Tl and {sup 203}Tl using laser absorption spectroscopy in a thallium oven near 1373 K. We determine that the hyperfine splitting between the F=1 and 0 levels of the {sup 4}P{sub 1/2} state in {sup 205}Tl is 75.179{+-}0.087 GHz. The F=0 LIS is -7.333{+-}0.025 GHz and the F=1 LIS is -6.500{+-}0.030 GHz, with the {sup 205}Tl level below the {sup 203}Tl level in both cases. We use our results together with other data to analyze the configuration mixing of the {sup 4}P{sub 1/2} state with the nearby (6s{sup 2}10s) {sup 2}S{sub 1/2} state. The mixing inferred from the hyperfine results is consistent with that inferred from the isotope shift results.
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