Abstract
The hyperfine structure and isotope shift of the heaviest known alkaline earth element radium (Z=88) have been studied in both the atomic Ra I and ionic Ra II spectra. The measurements, carried out by on-line collinear fast-beam laser spectroscopy, yield the hyperfine constantsA andB of the 7s and 7p 1/2 states in Ra II, of all states of the excited 7s 7p configuration and the 7s 7d 3 D 3 state in Ra I. The data allow a consistent evaluation of the nuclear moments for eight odd-A radium isotopes. In particular, a complete analysis of the hyperfine structure of thesp configuration in the two-electron system provides a stringent test of the validity of the semi-empirical modified Breit-Wills theory. It is shown that the effective operator formalism is equivalent, if relativistic correction functions are used to reduce the number of parameters. The semi-empirical hyperfine fields are evaluated and found to agree generally with those from ab-initio calculations. The isotope shifts in thes−p,s 2−sp,sp−sd transitions are analysed semi-empirically and compared with ab-initio calculations. The consistency of the different analyses proves their validity and classifies the spectrum of Ra I as a model case for a simple and clean two-electron spectrum.
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Ahmad, S.A., Klempt, W., Neugart, R., Otten, E.W., Wendt, K., Ekström, C.: Phys. Lett.133B, 47 (1983)
Rasmussen, E.: Z. Phys.86, 24 (1933);87, 607 (1934)
Russell, H.N.: Phys. Rev.46, 989 (1934)
Leander, G.A., Sheline, R.K.: Nucl. Phys.A413, 375 (1984)
Ragnarsson, I.: Phys. Lett.130B, 353 (1983)
Lurio, A.: Phys. Rev.142, 46 (1966)
Kluge, H.J., Sauter, H.: Z. Phys.270, 295 (1974)
Sandars, P.G.H., Beck, J.: Proc. R. Soc. London Ser. A289, 97 (1965)
Torbohm, G., Fricke, B., Rosén, A.: Phys. Rev.A31, 2038 (1985)
Das, T.P.: Private communication; (to be published)
Heully, J.L., Martensson-Pendrill, A.M.: Phys. Scr.31, 169 (1985)
Dzuba, V.A., Flambaum, V.V., Sushkov, O.P.: Phys. Scr.32, 507 (1985)
Ahmad, S.A., Klempt, W., Neugart, R., Otten, E.W., Wendt, K., Ekström, C.: (to be published)
Ahmad, S.A., Klempt, W., Neugart, R., Otten, E.W., Wendt, K.: Proceedings of the 7th International Conference on Atomic Masses and Fundamental Constants (AMCO-7), Darmstadt-Seeheim 1984
Mueller, A.C., Buchinger, F., Klempt, W., Otten, E.W., Neugart, R., Ekström, C., Heinemeier, J.: Nucl. Phys. A403, 234 (1983)
Ravn, H.L.: Phys. Rep.54, 201 (1979)
Anton, K.R., Kaufman, S.L., Klempt, W., Moruzzi, G., Neugart, R., Otten, E.W., Schinzler, B.: Phys. Rev. Lett.40, 642 (1978)
Buchinger, F., Mueller, A.C., Schinzler, B., Wendt, K., Ekström, C., Klempt, W., Neugart, R.: Nucl. Instrum. Methods202, 159 (1982)
Wendt, K., Ahmad, S.A., Buchinger, F., Mueller, A.C., Neugart, R., Otten, E.W.: Z. Phys. A — Atoms and Nuclei318, 125 (1984)
Lurio, A., Mandel, M., Novick, R.: Phys. Rev.126, 1758 (1962)
Breit, G., Lawrence, A.W.: Phys. Rev.44, 470 (1933)
Kopfermann, H.: Nuclear moments. New York: Academic Press 1958
Casimir, H.B.G.: On the Interaction between Atomic Nuclei and Electrons, Teylers Tweede Genotschap, Haarlem, 1932; new edn. San Francisco: W.H. Freeman Comp. 1963
Schwartz, C.: Phys. Rev.97, 380 (1955);105, 105, 173 (1957)
Hartree, D.R., Hartree, W.: Proc. R. Soc. London Ser. A164, 167 (1938)
King, G.W., Van Vleck, J.H.: Phys. Rev.56, 464 (1939)
Vainshtein, L.A., Poluektov, I.A.: Opt. Spectrosc. USSR12, 254 (1962)
Rosenberg, H.J., Stroke, H.H.: Phys. Rev. A5, 1992 (1972)
Sobel'man, I.I.: Introduction to the theory of atomic spectra. Oxford: Pergamon Press 1972
Brix, P.: Z. Phys.132, 579 (1952)
Steudel, A., in: Krebs, K., Nelkowski, H.: Z. Phys.145, 543 (1956)
Fricke, B.: Private communication
Lindgren, I., Rosén, A.: Case Stud. At. Phys.4, 93 (1974)
Büttgenbach, S. (ed.): Hyperfine structure in 4d and 5d shell atoms. In: Springer Tracts in Modern Physics. Vol. 96. Berlin, Heidelberg, New York: Springer-Verlag 1982
Bauche, J., Couarraze, G., Labarthe, J.J.: Z. Phys.270, 311 (1974)
Olsson, G., Salomonson, S.: Z. Phys. A — Atoms and Nuclei307, 99 (1982)
Arnold, M., Kowalski, J., Stehlin, T., Träger, F., zu Putlitz, G.: Z. Phys. A — Atoms and Nuclei314, 303 (1983)
Grundevik, P., Gustavsson, M., Lindgren, I., Olsson, G., Robertsson, L., Rosén, A., Swanberg, S.: Phys. Rev. Lett.42, 1528 (1979)
Heider, S.M., Brink, G.O.: Phys. Rev. A16, 1371 (1977)
Ulm, G., Bhattacherjee, S.K., Dabkiewicz, P., Huber, G., Kluge, H.-J., Kühl, T., Lochmann, H., Otten, E.W., Wendt, K., Ahmad, S.A., Klempt, W., Neugart, R.: Z. Phys. A — Atomic Nuclei325, 247 (1986)
Wolfe, H.C.: Phys. Rev.41, 443 (1932)
Büttgenbach, S.: Private communication
Becker, W., Fischer, W., Hühnermann, H.: Z. Phys.216, 142 (1968)
Sternheimer, R.M.: Phys. Rev.80, 102 (1950); Phys. Rev.146, 140 (1966)
Sternheimer, R.M.: Private communication
Loebner, K.E.G., Vetter, M., Hönig, V.: Nucl. Data Tables A7, 495 (1970)
Seltzer, E.C.: Phys. Rev.188, 1916 (1969)
Heilig, K., Steudel, A.: At. Data Nucl. Data Tables14, 613 (1974)
Blundell, S.A., Baird, P.E.G., Palmer, C.W.P., Stacey, D.N., Woodgate, G.K., Zimmermann, D.: Z. Phys. A — Atoms and Nuclei321, 31 (1985)
Bendali, N., Duong, H.T., Saint-Jalm, J.M., Vialle, J.L.: J. Phys. (Paris)45, 421 (1984)
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On leave from: Bhabha Atomic Research Centre, Bombay, India
On leave from: New York University, New York, USA