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Unformatted text preview: ensities for elements not wanted in fit
– e.g. that might be present as a result of a gold coating on the
sample • Apply ZAF corrections
– Iterative calculation - guess answer and converge on a good
– With standards or standard-less approaches CBEMS 164 – XRD, SEM & Microanalysis: Lecture 13
! 30 Atomic Number, Absorption and Fluorescence Effects!
For conceptual as well as calculation-based reasons, it is useful to divide the
matrix effects into those due to atomic number, Z, x-ray absorption, A, and x-ray
fluorescence, F. The most common form of the correction equation in quantitative
analysis is then: !'
! " "#$ #' ' ! " "#$ #' &
!! ' "
%! ' "
This equation must be applied separately for each element present in the sample.
Therefore, the Z, A, and F effects must be calculated separately for each element
in the sample.
It is important to develop a good understanding of the origin and the importance
of each of the three major effects on x-ray measurement for quantitative analysis. CBEMS 164 – XRD, SEM & Microanalysis: Lecture 13
! 31 CBEMS 164 – XRD, SEM & M...
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This note was uploaded on 01/16/2014 for the course CBEMS 164 taught by Professor Porter,j during the Fall '08 term at UC Irvine.
- Fall '08