Hyperfine structures and level isotope shifts of then 2 S 1/2 (n=7 ? 12)- andn 2 D 3/2,5/2 (n=6 ? 10)-levels of203,205Tl measured by atomic beam spectroscopy

Abstract

Applying atomic beam laser spectroscopy, hyperfine constants as well as level isotope shifts of the (6s2ns)2S1/2 levels (n = 7 – 12) and (6s2nd)2D3/2,5/2 levels (n = 6 – 10) have been measured in203Tl and205Tl. Furthermore, some new hyperfine constants and level isotope shifts of the Tl2P1/2,3/2-states are presented together with corrected results of earlier experiments. The hyperfine splittings have been compared with the predictions of the semiempirical theory. For theD-states a relatively poor agreement between these theoretical predictions and experimental results has been found. Using the experimental level isotope shifts and the δ〈r2〉 value from muonic X-ray data, results of single-configuration Dirac-Fock calculations have been tested.