Parametric study of isotope shifts in Ne I

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Abstract
An empirical interpretation of the isotope shifts, similar to that previously done for the 2p53s and 2p53p configurations, is performed for 14 infrared lines (2p54p to 2p53d and 2p55s'(1/2)1 to 2p54p) of Ne. I. In addition to trivial parameters (ie the first order contribution of the specific mass-shift inside 2p53d and an additive constant), term-dependent parameters for 2p54p and J-dependent parameters for 2p54p and 2p53d are introduced. The J-dependent parameter z2p is found to have almost the same value (0.6 mK) in the 2p53s, 2p53p, 2p54p and 2p53d 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.

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