Stark effect in odd-parity J = 1 levels of neutral barium

Abstract

Stark splitting of the barium 6snp P states with principal quantum numbers ranging from 8 to 15 and of the 5d7p P perturber level was measured in an atomic beam via pulsed laser excitation with timeand wave length-resolved fluorescence detection at low electric field strengths. Tensor polarizabilities were derived from the quantum beat signals observed in pure homogeneous electric fields. Strong variations of the tensor polarizabilities of the levels in the 6snp P series were found.

Unusually large polarizabilities and previously unidentified atomic states in Ba

“…The couplings to the close-lying states other than these three are suppressed because of the 1 The spin-orbit interaction can mix the 6s8p 3 P 1 and 6s8p 1 P 1 states so that the electric dipole coupling between the 6s7d 3 D 2 and 6s8p 1 P 1 states is not zero. This mixing, which is estimated in section V, is negligible in present crude estimation.…”

“…In this work, we measured the polarizabilities of seven energy levels of barium in between 35, 600 and 36, 000 cm −1 . Although polarizabilities of several levels of barium have been measured [1,2,3,4,5], those of many other states are not yet determined. Our primary motivation for this work is to obtain information that will be used in the analysis of sensitivity and possible systematic uncertainties in experiments searching for violation of Bose-Einstein statistics for photons [6].…”