Stark effect in 6s 5d and 5d 6p states in barium measured with laser-atomic-beam spectroscopy

Abstract

The tensor polarizabilities of the 6s 5d 1D, 3D levels and the 5d 6p lp, 1F, 3p and 3D states in barium, as well as differential scalar polarizabilities, have been measured using laser-atomic-beam spectroscopy. The measured values are compared with theoretical values derived from configuration interaction calculations of oscillator strengths. The lack of agreement underlines the need for more accurate calculations.

Stark- and Zeeman-effect of resonance lines of Ba I

“…In Table 2, the polarizabilities are compared with values obtained by other authors. Taking into account all the information contained in the paper of van Leeuwen and Hogervorst [1] and in the present work (Fig. 2), we are able to find connections between all the ground and all the upper levels mentioned in Table 1.…”

“…D , investigated in the present work, and the transition F °! D observed in [1] ( " !149(2) kHz/(kV/cm)). From both -type connections we get the same difference of the scalar polarizabilities of D and D , 27 MHz/(kV/cm).…”

“…Stark effect investigations of several transitions in Ba I have been performed by van Leeuwen and Hogervorst [1] upto 84 kV/cm using high resolution laser -atomic beam spectroscopy. In that paper an overview of measurements performed earlier is also given.…”

Stark effect, hyperfine structure and isotope shifts in highly excited states of BaI and CaI

“…More details on the experimental set-up can be found in [8] (two-step excitation set-up), Ref. [5] (high voltage Stark capacitor) and [9] (frequency doubling system).…”

“…However, variational calculations of the configuration-mixed wavefunctions (configuration interaction (CI) and multi-configuration Hartree-Fock (MCHF) calculations) may not be better either, as these are accurate only for the ground state and low-lying excited states and do not usually incorporate both configuration interaction and breakdown of LS-coupling. Extensive CI-calculations for barium [3,4] have been used to calculate the electric polarizabilities of the 6s5d and 6p5d states, which however compare well with experimental results for only part of the states [5]. The hyperfine structure and isotope shifts in the studied states in barium except those with total angular momentum J=l have been measured by Jitischin and Meisel [6].…”