Abstract
With interferometric optical hyperfine-structure techniques the isotope shifts of the five odd Eu I levels 4f 75d6s a 10D 5 2 , 7 2 , 9 2 , 11 2 , 13 2 were measured (relative to the ground state 4f 76s 28S 7 2 to be -144.72(1 0) mK, -143.5(6) mK, - 142.5(6) mK, -141.4(7) mK , respectively. The fact that the isotope shifts of these 4f 75d6s levels are nearly equal (about∓2 mK near - 143 mK) is a proof of the high purity of this configuration. The small J-dependence is shown to be due to a crossed-second-order-effect and described by the IS-parameter z 5 d = -2.48(20) mK. Because of the purity accurate screening ratios are evaluated, in good agreement with relativistic Hartree-Fock calculations of Coulthard. For the three levels 4f 75d6p z 10F 13 2 , 15 2 and z 8D 5 2 IS-values were measured to be -256.2(7) mK, -259(2) mK and -256(2) mK . On account of their purity a new and more accurate figure for the relative isotope shift of the configuration 4 f 75 d6 p, i. e. -258(2) mK, can be derived.
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