Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 1980-1984  (3)
Material
Years
Year
  • 1
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Excitation functions of the elastic and inelastic scattering cross sections of16O and18O nuclei on70Ge have been measured at angles between 45° and 175° and at beam energies from 31.5 to 57 MeV. A DWBA analysis has been performed in which the composite structure of18O has been taken into account according to the approach developed by Landowne and Wolter. Starting from an optical model potential determined from the elastic scattering data in the16O+70Ge channel, a consistent description of the16O+70Ge (2+, 3−) target excitation, the18O+70Ge elastic scattering and18O(2+)+70Ge projectile excitation cross sections near the Coulomb barrier has been obtained.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 311 (1982), S. 252-258 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird ein Verfahren zur Präparation von Spurenkonzentrat-Targets für die Multi-Elementbestimmung durch protoneninduzierte Röntgenemissions-Spektrometrie (PIXE) beschrieben. Dazu werden die Spuren Ag, Bi, Cd, Co, Cu, Fe, Hg, In, Mn, Ni, Pb, Pd, Tl und Zn als Diethyldithiocarbamidat-Chelate mit Hilfe einer Kollektor-Fällung angereichert. Target ist ein auf einer Plexiglas-Unterlage fixiertes Membranfilter mit der abfiltrierten Kollektorschicht. Die Targetmaterialien wurden im Hinblick auf eine möglichst geringe Blindwertbelastung ausgesucht. Als Kollektorelement wird Molybdän verwendet, dessen Röntgenlinien die Bestimmung der Spuren nicht stören und das zugleich als innerer Standard zur Korrektur von Ungleichmäßigkeiten in der Dicke der Kollektorschicht dient. Die Anreicherungsausbeuten der Mehrzahl der eingesetzten Elemente ist 〉 95%; die relative Standardabweichung des vollständigen Verbundverfahrens liegt unter 10 %. Es wurden Nachweisgrenzen (3 σ) ermittelt, die — je nach Element — zwischen 0,05 und 1 μg pro Target liegen. Die Richtigkeit des Verfahrens wurde an wäßrigen Modell-Analysenproben mit Hilfe unabhängiger Verfahren sichergestellt.
    Notes: Summary A procedure is described for the preparation of trace concentrate targets for a multi-element determination by proton induced X-ray emission spectroscopy (PIXE). Traces such as Ag, Bi, Cd, Co, Cu, Fe, Hg, In, Mn, Ni, Pb, Pd, Tl and Zn are preconcentrated as diethyldithiocarbamidate chelates by use of a collector precipitation. The target in this procedure is a membrane filter with the separated collector layer which is fixed to an acrylic glass support. The target materials were selected with regard to extremely low blanks. As collector element molybdenum is used, whose X-ray signals cause no measurable disturbances on the trace determination and which simultaneously serves as an internal standard to correct irregularities in the thickness of the collector layer. The recoveries of most of the investigated elements are 〉 95%; the relative standard deviation of the complete analytical procedure is smaller than 10%. Depending on the element, the limit of detection (3 σ) was found to vary between 0.05 and 1 μg regarded to the whole target. The accuracy of the method was verified by independent determination methods using models of water samples.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 316 (1983), S. 221-226 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Anhand einiger Beispiele (Trinkwasser, optisches Glas, Blut) wird die Anwendbarkeit der früher beschriebenen Methode [2] zur Präparation von Spurenkonzentrat-Targets nachgewiesen. Die Richtigkeit der durch PIXE gewonnenen Analysendaten wurde durch AAS überprüft.
    Notes: Summary Using drinking water, optical glass and blood as sample materials the applicability of the earlier described method [2] for the preparation of trace concentrate targets was proved. The accuracy of the analytical results obtained by PIXE was verified by AAS.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...