Doppler-free two-photon spectroscopy of neon. III. Isotopic shift and fine structure for the 2p5 4d and 2p5 5s configurations

Using Doppler-free two-photon spectroscopy, we have measured the isotopic shift 20Ne-22Ne for two-photon transitions between the 3s[3/2]2 metastable state and the excited states of the 2p5 4d and 2p5 5s configurations. The results are analyzed using the specific mass shift theory. We show that we can deduce from the expérimental data the expansion of the 1P Russel-Saunders term over the true eigenstates of the atom. We also obtain experimental determinations of the radial integrals J(4d, 2p) and J(5s, 2p). All the experimental results are in good agreement with theoretical predictions of Bauche and Liberman.