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  • 1
    Electronic Resource
    Electronic Resource
    Ultratrace analysis of calcium with high isotopic selectivity by diodelaser resonance ionisation mass spectrometry (1997)
    Springer
    Fresenius' journal of analytical chemistry 359 (1997), S. 361-363 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A resonance ionisation mass spectrometer for the ultratrace determination of calcium isotopes is presented. It achieves high overall efficiency, ultra-high isotopic abundance sensitivity of more than 1010 and complete suppression of isobars. The system can be used for isotope ratio studies on stable and long-lived trace isotopes with the final goal of radiodating via 41Ca-determination. For the different applications optical one-, two- or three-step resonance excitation and subsequent ionisation is applied using simple and inexpensive diodelasers. Additional mass analysis is accomplished in a commercial quadrupole mass spectrometer. The experimental set-up and first results on synthetical and meteorite samples are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050587
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Isotope shifts and hyperfine structure in the transitions in calcium II (1998)
    Springer
    The European physical journal 2 (1998), S. 33-39 
    Details
    ISSN: 1434-6079
    Keywords: PACS. 32.10.Fn Fine and hyperfine structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The isotope shift and hyperfine structure in the three - transitions in Ca II have been studied by fast ion beam collinear laser spectroscopy for all stable Ca isotopes. The metastable 3d states were populated within the surface ionization source of a mass separator with a probability of about 0.1%. After resonant excitation to the 4p levels with diode laser light around 850 nm the uv photons from the transitions to the ground state were used for detection. Hyperfine structure parameters A and B for the odd isotope 43Ca, as evaluated from the splittings observed, agree well with theoretical predictions from relativistic many-body perturbation theory. Field shift constants and specific mass shift constants were extracted from the measured isotope shifts and are discussed in comparison with expectation values from theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530050107
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    Paper (German National Licenses)
    Fulltext
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