Dear All, Really, I appreciate too much all your comments. I'm glad to be part of this list.
My best wishes. Mario. > I do exactly the same - fit tube tails using LaB6 standard and use the > parameters (usually w/o fitting) in all other refinements. Although tube > tails fitting helps a lot it's not perfect. > Peter Zavalij > > -----Original Message----- > From: Alan Coelho [mailto:alancoe...@bigpond.com] > Sent: Sunday, September 15, 2013 10:05 PM > To: Peter Y. Zavalij; mariomac...@tux.uis.edu.co; rietveld_l@ill.fr > Subject: RE: Instrumental resolution function > > Hi Peter, Mario > > I happen to have a Ni filter, Cu, LaB6 pattern that has a very similar > look to the one sent by Mario. Probably best to look at the 21.35 degrees > 2Th peak. The Ni filter cut-off occurs at 20.6 degrees 2Th, the satellite > group is hard to see due to the low angle and hence compression of the > emission profile. What made sense in the pattern was to fit Tube tails. > Across the whole patter the Rwp was reduced by 2.1% where Tube tails was > considered and the fit at the shoulders was good. > > Cheers > Alan > > > -----Original Message----- > From: rietveld_l-requ...@ill.fr [mailto:rietveld_l-requ...@ill.fr] On > Behalf Of Peter Y. Zavalij > Sent: Monday, 16 September 2013 10:55 AM > To: mariomac...@tux.uis.edu.co; rietveld_l@ill.fr > Subject: RE: Instrumental resolution function > > Hi Mario, > The shoulder you observe is what's left from "white" after it is cut off > by beta-filer. You could check the absorption edge of Ni and it is right > at the shoulder you observe. > Peter > > __________________________________ > Peter Zavalij > X-ray Crystallographic Center > University of Maryland > College Park, MD 20742 > Phone/Fax: (301)405-1861 > http:/www.chem.umd.edu/crystallography > > > > -----Original Message----- > From: rietveld_l-requ...@ill.fr [mailto:rietveld_l-requ...@ill.fr] On > Behalf Of mariomac...@tux.uis.edu.co > Sent: Sunday, September 15, 2013 6:08 PM > To: rietveld_l@ill.fr > Subject: Instrumental resolution function > > Dear All, > > I am calculating the corresponding instrumental resolution function of our > Bruker diffractometer which is operating in Bragg-Brentano geometry with > Cu radiation, using a nickel filter and LynxEye detector. > > The calculation is carried out by the Rietveld analysis of the LaB6 (660b) > NIST-standard. We observed the Kbeta peaks, but also some shoulders in the > left part of the peaks. We have some ideas about this but taking into > account that I'm not an actual expert, your comments will be very > important to me. > > In the attached file, I send an image to make a better illustration of my > doubts. > > Thanks in advance for your help. > Best Regards, > > Mario A. Macías > Universidad Industrial de Santander > Bucaramanga-Colombia. > >
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 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/ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
