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

Abstract. Applying atomic beam laser spectroscopy, hyperfine constants as well as level isotope shifts of the (6s2r~s) 2S1/2 levels (n = 7 -12) and (6s2nd) 2D3/2,5/2 levels (n = 6-10) have been measured in 2°3T1 and 2°5T1. Furthermore, some new hyperfine constants and level isotope shifts of the T1 2p1/2, 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 the D-states a relatively poor agreement between these theoretical predictions and experimental resuits has been found. Using the experimental level isotope shifts and the 6(r 2) value from muonic X-ray data, results of single-configuration Dirac-Fock calculations have been tested.

Measurement of7p1/2-state hyperfine structure and7s1/2-Ranjit1, Kealhofer2, Vukasin3 et al. 2014Phys. Rev. A

“…This experimental quantity can be combined with nuclear structure calculations regarding the magnetic moment and charge distributions in the isotopes to infer a value for the mean square isotopic change in these distributions. Such a calculation has been performed for both the ground 6p states and the excited 7s 203 Tl ), we note that our result is in statistical disagreement with the original 1988 result [14], though the agreement is improved when comparing to the later paper [16] which refers to a 'corrected evaluation'. Using the value derived for the level isotope shift of the 7s 1/2 state of +409.0(3.8) MHz [4], we can infer a 7p 1/2 -state level isotope shift of I 7p = −125.4(4.0) MHz.…”

“…A subset of these measurements were later corrected due to self-reported 'calibration and linearization errors' [16]. More recently, two measurements of the 7s 1/2 -state HFS, first by our group in 2000 [4], and then by Chen et al in 2012 [17] have confirmed the inaccuracy of the original set of measurements from the Giessen group.…”

Changes in mean-squared charge radii and magnetic moments of Tl179–184 measured by in-source laser spectroscopy

“…Experimental hfs spectra were fitted by the Voigt profile. In the fitting procedure the ratio a /a was fixed in accordance with its value for the stable isotope 205 [19]. The details of the fitting procedure can be found in Ref.…”

“…Correspondingly, both options were used in the 180 Tl-hfs fitting (see Table I). In columns 5 and 6 of Table I isotope shift and hfs constants obtained previously [7,19,21] are presented. They agree fairly well (within the experimental uncertainties) with the present data.…”

Frequency measurement of the 6P3/2→7S1/2transition of thallium

“…The hyperfine splittings of 7S 1/2 are taken from [13]. The level isotope shifts are taken from [14].…”