The only affect that specimen displacement should have on intensities with a parallel beam is a diminution sure to the diffracted beam being so far away that the parallel plate collimator cuts of the beam.
If you don't have any diffracted beam optics, then that won't be an issue, but then you will have a specimen displacement correction. The exact form depends on the geometry. If you are running in fixed incident beam mode, or transmission, then you'll have other intensity, absorption, and displacement corrections to worry about. Have a look at MR Rowles, IC Madsen Journal of Applied Crystallography 43 (3), 632-634, 2010 And Rowles & Buckley. J. Appl. Cryst. (2017). *50 <http://journals.iucr.org/j/services/archive.html>*, 240-251 <http://journals.iucr.org/j/issues/2017/01/00/kc5052/index.html> https://doi.org/10.1107/S1600576717000085 Matthew On 3 Feb 2017 02:38, "Nicolich, Jeffrey" <jeffrey.nicol...@gcpat.com> wrote: Shay, The important part is to have a parallel beam analyzer (crystal, parallel plate collimator or equivalent). The analyzer will then define the 2-theta position, not the sample. A more interesting question is regarding the intensities. Sample displacement will affect intensities in parallel beam geometry. The relationship depends on many factors, e.g. fixed or symmetric incident angle, surface roughness, sample transparency, flat plate or capillary, … Jeff Jeffrey Nicolich, Ph.D. | Principal Scientist *GCP Applied Technologies* 62 Whittemore Avenue | Cambridge, MA 02140 | T +1 617.498.3816 <(617)%20498-3816> | jeffrey.nicol...@gcpat.com <jeffrey.nicol...@gcpat.com> THIS E-MAIL AND ANY ATTACHED FILES ARE CONFIDENTIAL AND MAY BE LEGALLY PRIVILEGED. If you are not the addressee, any disclosure, reproduction, copying, distribution, or use of this communication is strictly prohibited. If you have received this transmission in error please notify the sender immediately and then delete this e-mail. *From:* rietveld_l-requ...@ill.fr [mailto:rietveld_l-requ...@ill.fr] *On Behalf Of *Martin Vickers *Sent:* Thursday, February 02, 2017 1:21 PM *To:* Shay Tirosh *Cc:* rietveld_l@ill.fr *Subject:* Re: 2-teta shift due to sample displacement in parallel beam Hi, Shay. The sample displacement / peak-position relationship is equivalent. Martin On 2 February 2017 at 15:14, Shay Tirosh <stiro...@gmail.com> wrote: Dear Rietvelders Does the 2-teta shift due to sample displacement in parallel beam is similar to Bragg Brentano mode? If not then what is the mathematical expression in parallel beam? Thanks Shay -- _________________________________________________ Dr. Shay Tirosh Institute for Nanotechnology & Advanced Materials Bar Ilan University Ramat Gan, 52900 Israel Phone: +972-(0)30-531-7320 Mobile: +972-(0)54-8834533 <+972%2054-883-4533> Email: stiro...@gmail.com _________________________________________________ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Please do NOT attach files to the whole list <alan.he...@neutronoptics.com> Send commands to <lists...@ill.fr> eg: HELP as the subject with no body text The Rietveld_L list archive is on http://www.mail-archive.com/ rietveld_l@ill.fr/ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -- Martin Vickers Dept. of Chemistry, UCL, 20, Gordon Street WC1H 0AJ 020 7679 5592 (or ex 25592) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Please do NOT attach files to the whole list <alan.he...@neutronoptics.com> Send commands to <lists...@ill.fr> eg: HELP as the subject with no body text The Rietveld_L list archive is on http://www.mail-archive.com/ rietveld_l@ill.fr/ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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