Using the XData Program
84
User Manual
Description
Hints
Threshold
In order to avoid a false positive identification of an element in a spectrum the
software has to be kept from fitting lines into the statistical background
fluctuations. Therefore a limit can be set below which an element will be
omitted in all subsequent fitting cycles. For thin layers of for example Pd or Au
the standard threshold can be too high. If layers are systematically quantified
with 0 the threshold should be set to lower values (e.g. 0.0005).
Density
The
default
density of each element is taken from a database. Changes are
only necessary for thin layers, where sometimes the density differs from the
bulk value or if undetectable elements are also abundant in the layer.
Use tolerances?
If selected, additional fields appear where the target value and low and high
concentration values can be entered. These tolerances are for element
concentrations in a layer. If the values are out of the limits their quantitative
result will be highlighted in the results presentation of XSpect Pro.
Line data
Allows for choosing the
Main line
for quantification. This line should be chosen
in a way that there is no overlap with fluorescence lines of other main
elements. Especially for proportional counters line overlap can be significant. In
some cases, e.g. thin top layers of Ag, choosing the L line instead of the K line
can improve the results significantly.
Note
Due to the limited energy resolution of proportional counters it is strongly
recommended for any Au analysis to select the Au L
β
(LB) as main line for
calculation.
Proceed to the
Normation
tab.
