Abstract
By means of classical interference spectroscopy, using enriched isotope samples, the isotope shift between178Hf and180Hf has been measured for 33 transitions in the Hf II spectrum. For the pure Russell-Saunders terms 5d 26s 4 F and2 F the parametric analysis yields a field-shift difference of 17(2) mK produced by the second-order interaction of the electrostatic operator and the field-shift operator. Semi-empirical calculations based on the non-relativistic Hartree-Fock method reproduce this value as well as the experimental field shifts if a factor of 1.68(6) is used to scale theab initio electron densities at the nucleus. The corresponding factor for the Hf atom is much smaller. This leads to a re-evaluation of screening ratios for Hf and to a more accurate value of the nuclear parameter λ178,180 (Hf)=0.072(4) fm2.
Similar content being viewed by others
References
Aufmuth, P., Steudel, A., Wöbker, E.: J. Phys. B21, 2237 (1988)
Kronfeldt, H.-D., Sinn, G.: Z. Phys. D — Atoms, Molecules and Clusters14, 205 (1989)
Aufmuth, P.: J. Phys. B15, 3127 (1982)
Finckh, E., Steudel, A.: Z. Phys.141, 19 (1955)
Meggers, W.F., Corliss, C.H., Scribner, B.F.: Tables of spectral line intensities I. Washington: National Bureau of Standards 1975
Moore, C.E.: Atomic energy levels III. Washington: National Bureau of Standards 1958
Mehlhorn, R.: Ph.D. Thesis, University of California 1968
Aufmuth, P., Heilig, K., Steudel, A.: At. Data Nucl. Data Tables37, 455 (1987)
Champeau, R.-J., Miladi, M.: J. Phys. (Paris)35, 105 (1974)
Bauche, J., Champeau, R.-J.: Adv. At. Mol. Phys.12, 39 (1976)
Slater, J.C.: Quantum theory of atomic structure, Vol. 2. New York: McGraw-Hill 1960
Froese Fischer, C.: Comput. Phys. Commun.14, 145 (1978)
Aufmuth, P., Kirsch, R., Steudel, A., Wöbker, E.: Z. Phys. D — Atoms, Molecules and Clusters7, 153 (1987)
Aufmuth, P., Wöbker, E.: Z. Phys. A — Atoms and Nuclei321, 65 (1985)
Aufmuth, P., Wöbker, E.: Z. Phys. D — Atoms, Molecules and Clusters2, 131 (1986)