Nuclear polarizability of helium isotopes in atomic transitions

Abstract

We estimate the nuclear polarizability correction to atomic transition frequencies in various helium isotopes. This effect is non-negligible for high precision tests of quantum electrodynamics or accurate determination of the nuclear charge radius from spectroscopic measurements in helium atoms and ions. In particular, it amounts to $28(3)$ kHz for 1S-2S transition in 4He+.

Comments: 11 pages, 4 figures, to be published in Phys. Rev. A. Revised version: misprints corrected, new references added