Dear Rietvelders,
The last sentence of the van Laar & Schenk paper is : "It seems to us justified to replace the name ‘Rietveld method’ in the future by the working title of the past: ‘profile method,’ or to honour the inventor by using ‘Loopstra method’." So, shame on Rietveld for having stolen Loopstra idea and mathematics from van Laar. Shame also for having modified a paper from Henk Schenk telling early the "true." Thanks to Bob van Laar for being so obviously modest and not considering that his mathematics matter in the method. Hope that among the 700 readers there are a few like me finding that paper completely incoherent and not convincing at all. The fact is that Hugo Rietveld was convinced that he was the main conceiver of the method and it is absolutely not impossible that Loopstra was only one of the numerous guys who had the idea tor fit a complete powder pattern instead of extracted intensities. Rietveld himself could be one of such guys. He decided to thank Loopstra and van Laar "for their suggestions and helpful criticisms". And this supposes that Loopsta and van Laar have very probably read the paper before submission and seen clearly that Rietveld was the only author of that now most cited 1969 paper... One of the main surprising sentence in the paper is : "If the community had awarded this (Loopstra & Rietveld, 1969) paper the recognition it deserved, the described profile refinement method would probably not be named after Rietveld alone. From the point of view of historical correctness this would have been much closer to the truth." Indeed, in that 1969 paper one can find : "In neutron powder diffraction, it is customary to use as least-squares data the integrated values of the diffraction peaks, even when these consist of more than one Bragg reflexion. The loss of information inherent in this technique can, however, be eliminated by using the complete observed powder pattern in a direct manner (Rietveld, 1967). This method determines the esti-mates of the structure parameters by finding a least-squares fit between the observed and calculated profile intensities." So, Loopstra cosigns a paper in 1969 with Rietveld in which he recognizes using the Rietveld method as described in the Rietveld 1967 paper ! Later Loopstra published many papers referencing the Rietveld 1969 paper. My conclusion is that people pretending now to speak in place of Loopstra should stop to do so. Best, Armel Le Bail > Message du 21/08/18 16:01 > De : h.sch...@uva.nl > A : Rietveld_l@ill.fr > Copie à : > Objet : [SUSPECTED SPAM] Rietveld > >We were worried that our article was not reaching the powder crystallographers >as it was published, although Open Access, in Acta Cryst A. Jim Kaduk advised >me to use this excellent list-server, so I became member and posted our >message. Now I�m happy to mention that since that day Acta A counted almost >700 downloads for the paper, so we clearly reached our goal. > > I was also pleased to follow the discussion, very lively and interesting, and > thank all contributors. The discussion was led day and night by our excellent > chair/moderator, Alan Hewat. > Alan, you did a fantastic job, summarising, adding information and making > essential links. Thank you very very much! > > As a matter of course we didn�t took part in the discussion, but now I like > to make one comment on the question �why now�. This is a quite long story and > carries a lot of non-scientific information. So it couldn�t be part of our > paper, but may be once it will be written down and published in the IUCr > Newsletter. > > Henk Schenk ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Please do NOT attach files to the whole list Send commands to 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/ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
