Can be modeled in the BGMN peak profile model as well, by modifying
the *.lam file by a series of additional Lorentzians on the 1/lambda
scale, see figure.
The same can be done for other spectral impurities, e.g. W L
satellites. Also "electronic effects" on the wavelength distribution
profile like the "edges" from the ROI settings of Si drift detectors
can be modelled in such a convolution based approach.
However, better to have a pure/simple wavelength distribution (clear
alpha1/2 doublet) by a monochromator or high energy resolution
detector, as any satellites make trouble in trace phase analysis and
do cause prolonged calculation time in complicated Rietveld refinements.
Reinhard
Zitat von Matthew Rowles <[email protected]>:
Topas can model them quite well. The functionality was introduced in
version 5.
On Mon, 4 Sep 2023, 00:54 Kurt Leinenweber, <[email protected]> wrote:
Hi, Are these things modeled in Rietveld programs, by chance? It seems
like a lot of baggage to put in a refinement but if it makes the results
better…
- Kurt
*From:* [email protected] <[email protected]> *On Behalf
Of *Thomas Gegan
*Sent:* Sunday, September 3, 2023 9:16 AM
*To:* Bish, David L <[email protected]>; Shay Tirosh <[email protected]>;
Fernando Igoa <[email protected]>
*Cc:* Rietveld List ([email protected]) <[email protected]>
*Subject:* RE: [EXT] Re: [External] Re: Step-like basline
I agree with a Ni absorption edge, possibly with a Kβ peak around 38° 2θ.
*Tom Gegan*
Chemist III
Phone: +1 732 205-5111, Email: [email protected]
Postal Address: BASF Corporation, , 25 Middlesex Essex Turnpike, 08830
Iselin, United States
*From:* [email protected] <[email protected]> *On Behalf
Of *Bish, David L
*Sent:* Sunday, September 3, 2023 7:08 AM
*To:* Shay Tirosh <[email protected]>; Fernando Igoa <
[email protected]>
*Cc:* Rietveld List ([email protected]) <[email protected]>
*Subject:* [EXT] Re: [External] Re: Step-like basline
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Hello Shay,
I think it is probably related to "tube tails". You can read about this in
the literature (e.g., on the BGMN web site) and you can model it in some
Rietveld software such as Topas. You don't normally notice this but it
becomes apparent with higher-intensity peaks.
Regards,
Dave
------------------------------
*From:* [email protected] <[email protected]> on behalf
of Fernando Igoa <[email protected]>
*Sent:* Sunday, September 3, 2023 3:06 AM
*To:* Shay Tirosh <[email protected]>
*Cc:* Rietveld List ([email protected]) <[email protected]>
*Subject:* [External] Re: Step-like basline
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Hey Shay,
Are you using a motorized slit during the measurement? These may open up
abruptly to compensate for the angular dependence of the footprint and thus
generate an abrupt increase in the intensity.
Hope it helps :)
On Sun, Sep 3, 2023, 8:50 AM Shay Tirosh <[email protected]> wrote:
Dear Rietvelders
I am attaching a zoom-in on a diffraction profile.
My question is what is the origin of the step-like profile next to a very
large reflection peak?
Is it a sample preparation problem?
Is it part of the baseline?
Thanks
Shay
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