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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 288 (1977), S. 171-179 
    ISSN: 1618-2650
    Keywords: Bestimmung von Lanthanoiden ; Röntgenspektrometrie ; protoneninduziert, Nachweisgrenzen, Empfindlichkeiten, dicke Proben, Mikroanalyse
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Zum Vergleich der Leistungsfähigkeit von zerstörungsfreien Verfahren der Rastermikroanalyse wurden Lanthanoiden-Standardproben für die energiedispersive Röntgenspektralanalyse auf der Basis von synthetischem Ca-Al-Silicat-Glas mit je 3–5 Lanthanoidenelementen (3–4 Gew.-%) hergestellt. Mit protoneninduzierter Röntgenspektralanalyse wurden bei einer Analysenzeit von 60 s Nachweisgrenzen von 100–400 μg/g an diesen dicken Proben bestimmt. Diese Nachweisgrenzen sind um den Faktor 2 bis 15 günstiger als die unter vergleichbaren Bedingungen mit wellenlängendispersiver Elektronenmikroanalyse bestimmten Nachweisgrenzen. Messungen mit energiedispersiver Röntgenspektranalyse am Rasterelektronenmikroskop zeigen, daß die Protonenanregung gegenüber der Elektronenanregung an diesen dicken Proben ein um den Faktor 20 besseres Signal/Untergrund-Verhältnis liefert.
    Notes: Summary Different analytical possibilities with non-destructive methods of X-ray spectrometric micro analysis have been compared. Synthetic Ca-Al-silicate glass with three to five lanthanoids (3–4 weight %) has been used as standard samples for energy-dispersive X-ray spectral analysis. Detection limits of 100–400 μg/g with PIXE have been determined on thick samples in analysis time periods of 60 s. These values are better by a factor of 2 to 15 than detection limits obtained under comparable experimental conditions on an electron microprobe with a crystal spectrometer. The peak to background ratio on thick samples with PIXE yields values which are better by a factor of 20 than those measured in energy dispersive X-ray analysis on a scanning electron microscope.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-6079
    Keywords: 35.10.-d ; 34.00 ; 36.00
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Based on the results from measurements of equilibrium convoy electron yieldsY e (q) in coincidence with projectiles of different outgoing chargesq from Pb31+ (1.4 MeV/u) and C6+ (1 MeV/u) on carbon foils we present a simple rate equation for convoy electron production which gives a consistent interpretation of yields, for light and heavy projectile ions in nonequilibrium and equilibrium of charge exchange. It will be pointed out that from convoy electron yields in the equilibrium regime of charge exchange the relative importance of ELC and ECC processes to the total yield cannot be determined. However, absolute normalized equilibrium convoy electron yieldsY f (q) allows us to estimate the overall contribution of convoy electrons to charge exchange in dependence on the ionization stateq.
    Type of Medium: Electronic Resource
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