Experimental and theoretical isotope shifts of strontium levels subject to very strong configuration mixing

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Abstract
The isotope shifts of the levels 5p2 1D2, 1S0 and 5sns 1S0(n=7, 8) of strontium have been measured between the isotopes 84, 86, 87 and 88 in two-photon transitions from the ground state using two lasers with different wavelengths. These levels occur below the beginning of the Rydberg series, and are known to exhibit very strong configuration mixing. Mass and field isotope shifts are calculated ab initio by means of the MCHF method for these levels and 5s4d 1D2, 5s6s 1S0. The qualitative agreement between theory and experiment confirms the necessity of taking into account the mixing (up to 50%) with both the 5p2 and 4d2 perturbers in the wavefunction expansions.
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