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  • 35.10.Fk  (3)
  • 35.10.Bg  (2)
  • 14.60  (1)
  • 21.10.-k  (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
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Cluster isobars for high-precision mass spectrometry (1991)
    Springer
    The European physical journal 20 (1991), S. 441-443 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 07.75. + h ; 35.10.Bg
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Doublet mass measurements of the isobars28Si3 and12C7 are performed by use of a Penning trap mass spectrometer and the Fourier transform ion cyclotron resonance (FT-ICR). The carbon and silicon cluster ions are produced by laser ablation. Results of these preliminary measurements are presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01544032
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  • 4
    Digitale Medien
    Digitale Medien
    A Penning trap for studying cluster ions (1986)
    Springer
    The European physical journal 3 (1986), S. 189-194 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 36.40 +d ; 35.10.Bg ; 29.20. −c
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We propose to use a Penning trap for spectroscopy of stored cluster ions. A similar device has been built for the purpose of mass measurements of short-lived nuclei produced at the on-line isotope separator ISOLDE/CERN. A resolving power of 500,000 in a mass measurement of39K and an accuracy of 2 × 10−7 for the85Rb/39K mass ratio were obtained. An efficiency for in-flight capture as high as 70% was achieved. The method provides very high sensitivity since typically only 10 to 100 ions are stored in the trap. We intend to perform laser spectroscopy on trapped Na clusters as a first application of the trap technique.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01384806
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    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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  • 6
    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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  • 7
    Digitale Medien
    Digitale Medien
    Isotope shift of182Hg and an update of nuclear moments and charge radii in the isotope range181Hg-206Hg (1986)
    Springer
    The European physical journal 325 (1986), S. 247-259 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.10.Ft ; 21.10.ky ; 35.10.Fk
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The technique of collinear fast-beam laser spectroscopy has been used to measure the isotope shifts of the even-even isotopes of Hg (Z=80) in the mass range 182≤A≤198 at the on-line mass separator ISOLDE at CERN. The atomic transition studied (6s 6p 3 P 2- 6s7s 3 S 1,λ=546.1 nm) starts from a metastable state, which is populated in a quasi resonant charge transfer process. The resulting changes in nuclear mean square charge radii show clearly that182Hg follows the trend of the heavier, even, weakly oblate isotopes. Correspondingly the huge odd-even shape staggering in the light Hg isotopes continues and the nuclear shape staggering and shape coexistence persists down to the last isotope investigated,181Hg. An update of isotope shift and hyperfine structure data for181–206Hg is given, with a revised evaluation of the differences in nuclear mean square charge radii and of spectroscopic quadrupole moments.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01294605
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