Parametric study of isotope shifts in Ne I

An empirical interpretation of the isotope shifts, similar to that previously done for the 2p 5 3s and 2p 5 3p configurations, is performed for 14 infrared lines (2p 5 4p to 2p 5 3d and 2p 5 5s'(1/2) 1 to 2p 5 4p) of Ne. I. In addition to trivial parameters (ie the first order contribution of the specific mass-shift inside 2p 5 3d and an additive constant), term-dependent parameters for 2p 5 4p and J-dependent parameters for 2p 5 4p and 2p 5 3d are introduced. The J-dependent parameter z 2p is found to have almost the same value (0.6 mK) in the 2p 5 3s, 2p 5 3p, 2p 5 4p and 2p 5 3d configurations. The meaning of all the parameters is discussed, taking into account first and second order contributions of the specific mass-shift and relativistic corrections to the mass-shift. Ab initio evaluations of the parameters, using MCHF (multiconfigurational Hartree-Fock) wavefunctions, are also reported.