J. Appl. Cryst. <http://journals.iucr.org/j> (2003). *36* <http://journals.iucr.org/j/contents/backissues.html>, 926-930 https://doi.org/10.1107/S0021889803006757 Use of double GoÈbel mirrors with high-temperature stages for powder diffraction: a strategy to avoid severe intensity fade Pamela S. Whitfield
. and I meant "The only effect that.." I can only blame insomnia and autocorrect for that faux pas. On 3 February 2017 at 03:01, Whitfield, Pamela S. <whitfiel...@ornl.gov> wrote: > Many, many, many years ago in a galaxy far away I wrote a paper that > probably no-one read that had some systematic data on this for a double > mirror parallel beam system (second mirror as an ‘analyzer’) in flat-plate > theta-theta geometry. This setup is much more sensitive to displacement > than most but readily shows the effect on position and intensity. > > Hunt around in J.Appl.Cryst. for 2003 and you should be able to find it > buried under a pile of more interesting papers… ;-) > > > > Pam > > > > Dr Pamela Whitfield MRSC CChem > > Instrument Scientist – POWGEN > > Spallation Neutron Source > > Oak Ridge National Laboratory > > PO Box 2008, MS-6475 > > Oak Ridge, TN 37831-6475 > > Tel: (865) 235-2605 > > Fax: (865) 574-6080 > > > > Chair: IUCr Commission on Powder Diffraction > > > > *From:* rietveld_l-requ...@ill.fr [mailto:rietveld_l-requ...@ill.fr] *On > Behalf Of *Nicolich, Jeffrey > *Sent:* Thursday, February 02, 2017 1:36 PM > *To:* Shay Tirosh > *Cc:* rietveld_l@ill.fr > *Subject:* RE: 2-teta shift due to sample displacement in parallel beam > > > > 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 > <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/ > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > > >
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 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/ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
