Il 15/01/2015 11:46, Fauth Francois ha scritto:
Dear Marco
Two possible origins to your problems
1- the data format of the input file your are using for your
refinement does not allow counts more than 10^6, This is typically the
case with GSAS input file format
Here at ALBA, as you suggested, we divide all the intensities by
factor 10
and..what you do with the errors for weighing the observations?
2- as previously suggested, you might have a problem of detection non
linearity and/or saturation. But since you measured at SLS liklely
using the MYTHEN detector able to accept extremely high count rates ,
I do not think this is the problem....
Francois
Dr. FAUTH Francois Experiments Division
CELLS - ALBAhttp://www.cells.es
Carretera BP 1413 Km 3.3
08290 Cerdanyola del Vallès, Barcelona (Spain)
Phone/Fax +34 93 592 4325 / +34 93 592 4301
On 1/15/2015 8:49 AM, Marco Taddei wrote:
Dear Rietvelders,
Yesterday I was dealing with the refinement of silicon collected with
synchrotron radiation at the MS beamline at SLS. The intensity of
many reflections exceeds 10^6 counts, in some cases even reaching
almost 10^7 counts.
I noticed that the peaks exceeding 10^6 counts were kind of
truncated, with the consequence that the pattern looked quite
different from what it was supposed to be.
Since I always treated data from home diffractometers so far, I never
came across such an issue.
My idea was to just divide all of the intensities by 10, so as to
preserve the relative intensities and the signal/background ratio, is
this a possible solution to the issue? Or there are maybe some other
ways to deal with it?
Thanks in advance.
Best,
Marco
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Norberto Masciocchi
Dipartimento di Scienza e Alta Tecnologia
Università dell'Insubria
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E-mail: norberto.mascioc...@uninsubria.it
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