Isotope shifts and electron densities in W I. I. Parametric analysis and theoretical field shifts

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Abstract
The isotope shift in the arc spectrum of tungsten was studied in eight lines by means of a photoelectric recording Fabry-Perot spectrometer with digital data processing for 182,184W, 184,186W and 182,186W with the use of highly enriched isotope samples. The observed shifts were analysed by means of the parametric method. For the isotope pair 184,186W the g2 parameter yields a difference of 34 (3) mK between the field shifts of 5d56s 7S and 5S. This difference is produced by the interaction of the electrostatic operator and the field-shift operator. It indicates a large contribution of crossed-second-order effects of the field shift of the terms of 5d56s. From the s parameter and other optical measurements, the nuclear parameter lambda δ(r2) between 184W and 186W was evaluated to be 0.084 (7) fm2. It was also possible to demonstrate spin-dependent effects. The experimental data are compared with results from non-relativistic Hartree-Fock calculations for all the terms of the mixing configurations 5d 46s2, 5d56s and 5d6. Using an empirical scaling factor, S*(74) = 1.32(9), the agreement is very satisfactory.

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