Armel's supervisor, Daniel Louer, made important contributions to the description of the line shape for profile refinement with x-rays, but that was 10 years later. His 1986 paper <https://doi.org/10.1017/S0885715600011738> references Rietveld (1969) but uses a different type of profile refinement developed by Sonneveld & Visser (1975). "*The strategy consists of the refinement of different peaks in a cluster, one at a time..."*
Daniel was eventually won over to the Petten method, and there is a nice picture of him with Hugo at the 1999 IUCr Glasgow symposium that I organised on "30 Years of Rietveld Refinement <http://ww1.iucr.org/news/v7n4/7-4.pdf>" (page 7). At my age, I prefer Googling the literature rather than relying on my remembrances :-) On Fri, 17 Aug 2018 at 00:22, Alan Hewat <alan.he...@neutronoptics.com> wrote: > > * I remember that a Fortran version was in tests there (in Rennes in > 1975-76), probably one of these 27 copies distributed by Hugo Rietveld > himself to institutes all over the world.* > > Rietveld worked with neutron powder diffraction on magnetic and heavy > metal oxides. An x-ray lab. in Rennes was probably not one of the selected > 27 institutes all over the world. As Rietveld wrote in the paper you cited, > "*The response was slight, or, rather, non-existent*", and by 1975-76 he > had already left science. Probably, that's how legends begin. > > On Thu, 16 Aug 2018 at 21:05, Le Bail Armel <le-bail.ar...@orange.fr> > wrote: > >> Hi, >> >> >> >> Sorry for that blank email... >> >> Since times are to old stories about the Rietveld method, I first >> heard about it in 1975-76 during my "3ème cycle" thesis in D. Grandjean >> laboratory, Rennes, France, under the direction of D. Louër. The thesis >> was about profile-shapes broadening due to powder small grain size. >> http://www.cristal.org/rapport/Le-Bail-These-3eme-Cycle.pdf >> >> I did not use the Rietveld method at that time but I remember that >> a Fortran version was in tests there, probably one of these 27 copies >> distributed by Hugo Rietveld himself to institutes all over the world. >> http://home.wxs.nl/~rietv025/Rietveld%20Method.docx >> >> My profile shapes were quite Lorentzian and there was considerable >> anisotropic broadening, something not yet accountable by the Rietveld >> method at that time focused on Gaussian peak shapes. >> >> I was not back about the Rietveld method before the XIII IUCr Congress, >> 1984, Hamburg, where I proposed a way to undertake such X-ray complex >> shapes: "The Rietveld method using an experimental profile convoluted >> by adjustable analytical function". This was the ARIT software later >> used in 1987 for intensities extraction purposes by iterating the >> Rietveld decomposition formula, leading to many SDPDs (Structure >> Determination by Powder Diffractometry). >> http://cristal.org/mespapiers-PDF/1984/1984-Rietveld-a31186.pdf >> http://www.cristal.org/arit.html >> >> Best, >> >> >> >> Armel >> >> >> >> PS- Better to write your own story clearly yourself before to leave the >> planet, >> >> even if nobody apparently read it. >> >> http://www.cristal.org/iniref/lbm-story/ >> >> >> >> >> >> >> >> >> >> >> >> >> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ >> 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/ >> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ >> >> > > -- > ______________________________________________ > * Dr Alan Hewat, NeutronOptics, Grenoble, FRANCE * > <alan.he...@neutronoptics.com> +33.476.98.41.68 > http://www.NeutronOptics.com/hewat > ______________________________________________ > -- ______________________________________________ * Dr Alan Hewat, NeutronOptics, Grenoble, FRANCE * <alan.he...@neutronoptics.com> +33.476.98.41.68 http://www.NeutronOptics.com/hewat ______________________________________________
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 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/ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
