On the hyperfine structure and isotope shift of radium

K. Wendt, S. A. Ahmad, W. Klempt, R. Neugart, E. W. Otten, H. H. Stroke

    Research output: Contribution to journalArticle

    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 constants A and B of the 7 s and 7 p1/2 states in Ra II, of all states of the excited 7 s 7 p configuration and the 7 s 7 d3D3 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 the sp 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 the s-p, s2-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.

    Original languageEnglish (US)
    Pages (from-to)227-241
    Number of pages15
    JournalZeitschrift für Physik D Atoms, Molecules and Clusters
    Volume4
    Issue number3
    DOIs
    StatePublished - Sep 1987

    Fingerprint

    radium
    hyperfine structure
    isotope effect
    shift
    radium isotopes
    configurations
    laser spectroscopy
    electrons
    formalism
    moments
    operators
    evaluation

    Keywords

    • 31.30 Gs
    • 35.10 Fk

    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics
    • Physics and Astronomy(all)

    Cite this

    Wendt, K., Ahmad, S. A., Klempt, W., Neugart, R., Otten, E. W., & Stroke, H. H. (1987). On the hyperfine structure and isotope shift of radium. Zeitschrift für Physik D Atoms, Molecules and Clusters, 4(3), 227-241. https://doi.org/10.1007/BF01436633

    On the hyperfine structure and isotope shift of radium. / Wendt, K.; Ahmad, S. A.; Klempt, W.; Neugart, R.; Otten, E. W.; Stroke, H. H.

    In: Zeitschrift für Physik D Atoms, Molecules and Clusters, Vol. 4, No. 3, 09.1987, p. 227-241.

    Research output: Contribution to journalArticle

    Wendt, K, Ahmad, SA, Klempt, W, Neugart, R, Otten, EW & Stroke, HH 1987, 'On the hyperfine structure and isotope shift of radium', Zeitschrift für Physik D Atoms, Molecules and Clusters, vol. 4, no. 3, pp. 227-241. https://doi.org/10.1007/BF01436633
    Wendt, K. ; Ahmad, S. A. ; Klempt, W. ; Neugart, R. ; Otten, E. W. ; Stroke, H. H. / On the hyperfine structure and isotope shift of radium. In: Zeitschrift für Physik D Atoms, Molecules and Clusters. 1987 ; Vol. 4, No. 3. pp. 227-241.
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