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  • 31.30.Gs  (3)
  • 07.80  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Isotope shifts of neutron-deficient gold isotopes with 193≧A≧190 (1985)
    Springer
    The European physical journal 321 (1985), S. 537-547 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.10.-k ; 27.80+w ; 31.30.Gs
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The isotope shift between197Au (stable) and the radioactive Au isotopes190Au,191Au,192Au and193Au were determined by resonance fluorescence spectroscopy in the 6s 2 S 1/2–6p 2 P 1/2.λ=267.6nm line. The unstable Au isotopes were produced at the ISOLDE mass separator at CERN. The nuclei were investigated semi on-line in a resonance vessel, heated to 1,400°C. The results areδν 190,197=−11.12(39) GHz,δν 191,197=−9.67(12) GHz,δν 192,197=−8.32(15) GHz,δν 193,197=−6.29(11) GHz, corresponding to a change of the mean-square charge radius byδ〈r 2〉190,197 =0.261(12) fm2,δ〈r 2〉191,197=0.227(5) fm2,δ〈r 2〉192,197=0.195(5) fm2,δ〈r 2〉193,197 =0.148(4) fm2.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01432427
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    A high-temperature laser ion source for trace analysis and other applications (1990)
    Springer
    Applied physics 51 (1990), S. 200-206 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 07.77 ; 07.80 ; 32.80 F ; 14.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We report here on the development of a high-temperature laser ion source useful for trace analysis and other applications. It consists of a high temperature ionization chamber, three tunable dye lasers pumped by copper vapor lasers for stepwise resonant ionization and a Mattauch-Herzog mass spectrometer for the analysis of photo-ions. The principle of the laser ion source and its theoretical efficiency are discussed, where the efficiency of a laser ion source is the ratio of photo-ions extracted out to the number of atoms introduced into the cavity. Experimentally, an efficiency of 2×10−3 has been achieved for technetium. The scheme of gated detection is described which is used for suppressing isobaric background of molybdenum. The possible improvements are briefly mentioned for achieving isotopic analysis of 108 atoms of 97,98Tc in the presence of 1015 atoms of molybdenum, as separated chemically from molybdenum ore. Such an analysis of technetium isotopes produced in molybdenite ore by a (v,e −) reaction, is expected to yield information about the solar neutrino flux.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00405739
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  • 3
    Digitale Medien
    Digitale Medien
    Isotope shift and hyperfine structure of stable platinum isotopes (1987)
    Springer
    The European physical journal 7 (1987), S. 193-201 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 31.30.Gs ; 35.10.Fk
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Isotope shift (IS) and hyperfine structure (hfs) measurements have been performed on seven lines of the platinum I spectrum with interference as well as laser fluorescence spectroscopy. In the latter case a frequency-doubled single-mode cw dye laser was applied. The IS of190Pt with a natural abundance of only 0.01% was determined to beδν 190, 192=−38.65(8) mK in theλ306.47 nm transition. The IS parameters and the effective hfs integrals in the configuration (5d+6s)10 were determined in intermediate coupling by a least squares fit of the IS and hfs data with eigenvectors obtained from the platinum fine structure (fs). The results are compared with theoretical values and yield improvedδ〈r 2〉 data.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01384588
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  • 4
    Digitale Medien
    Digitale Medien
    Hyperfine structure in 5s 4d 3 D —5snf transitions of87Sr (1993)
    Springer
    The European physical journal 28 (1993), S. 275-281 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 31.30.Gs ; 31.50. + w ; 35.10.Fk
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The hyperfine spectra of the 5s4d 3 D 1-5s20f, 5s4d 3 D 2-5s23f, and 5s 4d 3 D 3-5s32f transitions of87Sr (I=9/2) have been measured by collinear fast beam laser spectroscopy. The structure in the upper configurations is highly perturbed by fine structure splitting that is of comparable size to the hyperfine interaction energy. These perturbations can be adequately treated with conventional matrix diagonalization methods, using the 5s-electron magnetic dipole interaction terma 5s and the unperturbed fine structure splittings as input parameters. Additionally, hyperfine constants for the lower 5s4d 3 D configurations, including theA- andB-factors and a separation of the individuals- andd-electron contributions to these factors, are derived.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01437259
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