ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
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
Collection
Keywords
Publisher
Years
  • 1
    Electronic Resource
    Electronic Resource
    Matrix effects in the x-ray fluorescence method (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 11 (1982), S. 135-139 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The matrix effects which exist in x-ray fluorescence analysis are considered, Shiraiwa and Fujino equations being the initial point of these considerations. Matrix effects are divided into two groups: simple and so-called unusual. Among the simple ones, absorption and enhancement effects are considered. New concepts of ‘absolute’ and ‘relative’ absorption effects are introduced. It is shown that the expressions of simple matrix effects can be easily separated in the Shiraiwa and Fujino equation. Additionally, the unusual matrix effects, including the Birks-Harris effect and some cases of the Mitchell-Kellam effects, were found to be well described by certain equations based on the Shiraiwa and Fujino equation, provided the appropriate assumptions were made.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300110309
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Limiting values of matrix effects in XRF analysis and some of its consequences (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 15 (1986), S. 87-93 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: This paper considers some limiting values of matrix effects on the basis of the version of the Shiraiwa and Fujino equation which takes into account matrix effects, expressed explicitly. It has been proved that one can obtain the limiting values of absorption and enhancement effects in those cases in which the concentration of the matrix element j tends to unity, and boundary values of absorption and self-absorption effects in the case when photons of exciting x-ray radiation have energies that considerably exceed the value of the absorption edge of the analysed element i. In addition, the limit of the enhancement effect at the point of the absorption edge of the matrix element j is given. A hypothesis is formulated concerning the linearity of the reciprocal of the enhancement function versus the concentration of the enhancing element j. This implies new important solutions of the Tertian equation, at least in the case of monochromatic excitation. The notion of effect equilibrium points and a search for them were also considered. Effect equilibrium points were registered as a consequence of concentration changes and also of changes in the exciting radiation energy.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300150204
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...