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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 54 (1992), S. 404-410 
    ISSN: 1432-0630
    Keywords: 07.65 ; 35.00 ; 42.55 R
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A pump- and probe-beam technique is used for measuring time-resolved excited-state absorption (ESA) and stimulated-emission (SE) spectra of Er3+ doped YAlO3. The Er3+ 4 I 15/2 → 4 F 7/2 transition of the sample is excited at 488 nm by an excimer laser pumped dye laser. The ESA and SE of broadband xenon flashlamp light is monitored between 300 and 860 nm by an optical multichannel analyzer (OMA). The analysis of the experimental results provides information on the effective cross sections σESA and σSE originating from several levels and on the populations of these levels. To our knowledge this represents the first detailed investigation of time-resolved ESA and SE over a broad spectral range in rare-earth doped materials.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 287 (1977), S. 121-127 
    ISSN: 1618-2650
    Keywords: Best. von Calcium ; in Mineralien ; Isotopen-verdünnung/Massenspektrometrie ; Ionenaustauscher, Thermionen-MS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Ein Verfahren zur massenspektrometrischen Isotopenverdünnungsanalyse geringer Calciumkonzentrationen in Mineralien wurde entwickelt. Die einzelnen analytischen Teilschritte (Aufschlußverfahren mit Isotopenverdünnung, Calciumseparation und massenspektrometrische Messung) des Gesamtverfahrens werden beschrieben. Für einen 42Ca-Indicator wird die optimale Indicatorzugabe sowie Auswirkungen der massenspektrometrischen Messungen auf den Fehler des Analysenverfahrens diskutiert. Bei der chromatographischen Calciumabtrennung an einem stark sauren Ionenaustauscher wird eine vollständige Separation von Kalium erreicht. Der Calciumgehalt im Bereich von 0,15–0,004 Gew.-% zweier Kalifeldspäte und eines Lepidolithen wird mit externen relativen Standardabweichungen von 0,9–5,1% bestimmt.
    Notes: Summary A mass spectrometric isotope dilution analysis for the determination of small calcium contents is developed. The different steps (decomposition of the mineral including isotope dilution technique, calcium separation and mass spectrometric measurement) of the analytical procedure are described. For a 42Ca spike the optimum spike addition is calculated. The dependence of the analysis error on the mass spectrometric measurements is discussed. Using a chromatographic method with a strong acidic ion exchanger calcium can be completely separated from potassium. The calcium content in the range of 0.15–0.004% of two feldspars and of one lepidolite is determined with external relative standard deviations of 0.9–5.1%.
    Type of Medium: Electronic Resource
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