It's Shay who has the problem, not Habib, and we have heard nothing more from him following his initial enquiry and all this expert advice. ________________________________ Dr Alan Hewat, NeutronOptics Grenoble, FRANCE (from phone) [email protected] +33.476984168 VAT:FR79499450856 http://NeutronOptics.com/hewat _______________________________
On Mon, 4 Sept 2023, 19:39 Roberto de Avillez, <[email protected]> wrote: > Dear Habib, > > Run the silicon crystal diffraction without the Ni filter, you will > confirm Kleeberg's explanation. > > Best regards, > Roberto de Avillez > > Em seg., 4 de set. de 2023 às 07:20, Habib Boughzala < > [email protected]> escreveu: > >> Many thanks Reinhard, >> >> That's exactly what I wanted to say by "I can assure that our Bruker D8 >> is clean and optimized!" >> Otherwise, in some other cases of well conditioned thin film no similar >> phenomenon is observed! >> So, yes, it's obviously possible that your point of view is right. >> >> Regards >> Habib >> >> >> ------ Message d'origine ------ >> De "Reinhard Kleeberg" <[email protected]> >> À "Habib Boughzala" <[email protected]> >> Cc [email protected] >> Date 04/09/2023 11:07:50 >> Objet Re: Re[2]: [EXT] Re: [External] Re: Step-like basline >> >> Dear Habib, >> the phenomenom "satellites or edges" originates from the diffraction >> process. The critical parameters are: >> - spectral pureness of the primary beam (primary beam monochromator, tube >> spectral contamination like W...) >> - the use of K beta absorbtion filter (and its thickness) >> - the energy resolution ("window") of the detector system. >> Even a D8 system may be equipped with different types of detectors, slits >> and energy limits can be set differently for an identical configuration, >> and quite often satellite peaks may appear later in the time of use (aging >> of the tube produces more W L, Fe filters may corrode and get >> perforated...). So it is strictly recommended to check the instrument >> peridically, by measuring a full pattern of a profile standard (LaB6 or Si >> or similar). >> Greetings >> Reinhard >> >> Zitat von Habib Boughzala <[email protected]>: >> >> >> Dear all, >> I would like to send you my witness related to this kind of observation. >> I can assure that our Bruker D8 is clean and optimized! >> >> In many cases of well conditioned thin film (spin coating or controlled >> diffusion) material this kind of phenomenon is visible around the highest >> reflection, especially when the preferred orientation is drastically >> present. >> >> So, in my opinion, Reinhard and Alan are right, and what is observed is >> just like reflections broadening, asymmetry, shifting ...etc ... and can be >> related to the material behavior. >> Now, what is the physical (crystallographic!) property responsible of >> this phenomenon? let's open the floor for a large discussion. >> >> >> Habib >> >> >> ------ Message d'origine ------ >> De "Alan W Hewat" <[email protected]> >> À "Reinhard Kleeberg" <[email protected]> >> Cc [email protected] >> Date 04/09/2023 09:29:08 >> Objet Re: [EXT] Re: [External] Re: Step-like basline >> >> >> Reinhard is right that it is best to improve the instrument to produce >> cleaner data. I'm concerned about the advice to model all kinds of features >> whose origin is not fully understood, simply to obtain a better fit. Shay >> has told us nothing about his instrument or his conditions of data >> collection. He asks "Is it a sample preparation problem", to which the >> obvious reply is "Do you see this with other samples or different >> materials" ? Only he can answer that. If the answer is yes, he might try >> modifying his instrument (remove filters etc) to see what effect that has >> on the pattern from a simple well characterised material. Again only he can >> do that. Data collection is an experimental science, and data refinement >> should not be reduced to a "black box" computer program where extra >> parameters can be added to reduce the R-factor. >> Alan. >> >> On Mon, 4 Sept 2023 at 08:18, Reinhard Kleeberg < >> [email protected]> wrote: >> >> 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 >> >> >> >> Some people who received this message don't often get email from >> [email protected]. Learn why this is important >> < >> https://urldefense.com/v3/__https:/aka.ms/LearnAboutSenderIdentification__;!!IKRxdwAv5BmarQ!fFhSHn4S5iEzkW-O9lvWG-OzoqK_2SKhRniGa71nxuOL3GcxiyD83i2mnNN0Z48HPkn4zjKqH-aqqA$ >> > >> >> 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 >> >> >> >> This message was sent from a non-IU address. Please exercise caution when >> clicking links or opening attachments from external sources. >> >> >> >> 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 >> >> -- >> >> >> >> >> >> >> >> >> >> >> >> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ >> Please do NOT attach files to the whole list < >> [email protected] >> > >> Send commands to <[email protected]> eg: HELP as the subject with no body >> text >> The Rietveld_L list archive is on >> http://www.mail-archive.com/[email protected]/ >> < >> https://urldefense.com/v3/__http:/www.mail-archive.com/[email protected]/__;!!IKRxdwAv5BmarQ!fFhSHn4S5iEzkW-O9lvWG-OzoqK_2SKhRniGa71nxuOL3GcxiyD83i2mnNN0Z48HPkn4zjJTf8rNHg$ >> > >> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ >> >> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ >> Please do NOT attach files to the whole list < >> [email protected] >> > >> Send commands to <[email protected]> eg: HELP as the subject with no body >> text >> The Rietveld_L list archive is on >> http://www.mail-archive.com/[email protected]/ >> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ >> >> >> >> >> >> -- >> TU Bergakademie Freiberg >> Dr. R. Kleeberg >> Mineralogisches Labor >> Brennhausgasse 14 >> D-09596 Freiberg >> >> Tel. ++49 (0) 3731-39-3244 >> Fax. ++49 (0) 3731-39-3129 >> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ >> Please do NOT attach files to the whole list < >> [email protected]> >> Send commands to <[email protected]> eg: HELP as the subject with no body >> text >> The Rietveld_L list archive is on >> http://www.mail-archive.com/[email protected]/ >> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ >> >> >> >> >> -- >> ______________________________________________ >> Dr Alan Hewat, NeutronOptics, Grenoble, FRANCE >> <[email protected]> +33.476.98.41.68 >> http://www.NeutronOptics.com/hewat <http://www.neutronoptics.com/hewat> >> ______________________________________________ >> >> >> >> -- TU Bergakademie Freiberg >> Dr. R. Kleeberg >> Mineralogisches Labor >> Brennhausgasse 14 >> D-09596 Freiberg >> >> Tel. ++49 (0) 3731-39-3244 >> Fax. ++49 (0) 3731-39-3129 >> >> >> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ >> Please do NOT attach files to the whole list <[email protected] >> > >> Send commands to <[email protected]> eg: HELP as the subject with no body >> text >> The Rietveld_L list archive is on >> http://www.mail-archive.com/[email protected]/ >> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ >> >> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > Please do NOT attach files to the whole list <[email protected] > > > Send commands to <[email protected]> eg: HELP as the subject with no body > text > The Rietveld_L list archive is on > http://www.mail-archive.com/[email protected]/ > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > >
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Please do NOT attach files to the whole list <[email protected]> Send commands to <[email protected]> eg: HELP as the subject with no body text The Rietveld_L list archive is on http://www.mail-archive.com/[email protected]/ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
