> > I am deeply touched by the death of *Professor** Rietveld*. I present my > sincere condolences to his family, his friends and all those who knew > him. His contribution to field of crystallography will be remembered > for ever. > > > - > > - > > With warm regards > > Aga Shahee > > Post-Doc Fellow > > Dept. of Physics > > IITB, Mumbai, India > > Email Id: sha...@phy.iitb.ac.in > - > > Contact No: +91-9892712175 > - > > Lab. Ext.: 4567/4697 > - > > > - > > > > > On Tue, Jul 19, 2016 at 7:38 AM, Reese, Bill L < > bill.l.re...@exxonmobil.com> wrote: > >> Very sad to hear this news. Dr. Rietveld changed the course of my >> career. I regret not getting the chance to meet him. >> >> >> >> >> >> >> >> *William L. (Bill) Reese* >> >> >> >> *X-ray Diffraction Laboratory* >> >> >> >> *Rietveld Analysis* >> >> *Mineral Quantification* >> >> *Clay Mineralogy* >> >> >> >> (832)624-9030 >> >> >> >> Lab Building >> >> LB 3B 320 >> >> 22777 Springwoods Village PKWY >> >> Spring, TX 77389 >> >> >> >> *bill.l.re...@exxonmobil.com <bill.l.re...@exxonmobil.com>* >> >> >> >> *From:* rietveld_l-requ...@ill.fr [mailto:rietveld_l-requ...@ill.fr] *On >> Behalf Of *Alan Hewat >> *Sent:* Tuesday, July 19, 2016 7:58 AM >> *To:* rietveld_l@ill.fr >> *Subject:* The passing of Hugo Rietveld >> >> >> >> *The passing of Hugo Rietveld, on the 50th anniversary of Rietveld >> Refinement and the 100th anniversary of Powder Diffraction* >> >> >> >> It is our sad duty to report the death of Hugo Rietveld at the age of 84 >> after a short illness. He leaves behind his wife, a son and two daughters >> to whom we extend our heartfelt sympathy on behalf of the more than one >> thousand members of the Rietveld Mailing List. >> >> >> >> Hugo was born on the 7 March 1932 in The Hague and migrated to Western >> Australia with his family, where in 1957 he enrolled at the University of >> WA at the same time as Brian O’Connor and Syd Hall. He obtained his Ph.D. >> under the supervision of Ted Maslen who had studied under Dorothy Hodgkin >> at Oxford. Hugo pioneered single crystal neutron diffraction at Lucas >> Heights Sydney with Terry Sabine, and their first paper was published in >> Nature in 1961. >> >> >> >> Clews C J B, Maslen E N, Rietveld H M and Sabine T M (1961) Nature 192 154 >> <http://www.nature.com/nature/journal/v192/n4798/abs/192154a0.html> >> >> “X-Ray and Neutron Diffraction Examination of p-Diphenylbenzene" >> >> >> >> Hugo's experience with manual data collection and refinement convinced >> him of the need to computerise such tasks, and at Lucas Heights and the UWA >> he programmed two of the first IBM-1620 mainframes >> <http://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP1620.html> >> in >> Fortran-II. After obtaining his Ph.D. in 1964 with Dorothy Hodgkin as >> external examiner, (she had received the Nobel Prize for her work on >> penicillin and vitamin B12), he joined the neutron diffraction group of the >> Reactor Centrum Nederland in Petten and his interest turned to powder >> diffraction because large single crystals were not available for the >> inorganic materials of interest. >> >> >> >> The young group at Petten including Bert Loopstra, Bob van Laar and Hugo >> Rietveld first addressed the problem of overlapping powder reflections by >> using a relatively long neutron wavelength (2.6 Å) with a pyrolytic >> graphite filter. This spread out the long d-spacing peaks, allowing more of >> them to be resolved, and is still a good solution for the magnetic >> structures in which they were interested. However, for structure refinement >> many peaks were still unresolved, and the shorter d-spacings needed for >> high atomic resolution could not even be seen. >> >> >> >> In a 1966 paper, Hugo already used intensities from overlapping Bragg >> peaks. Along with others with the same problem, he then tried to fit >> multiple peaks to overlapping regions, but with limited success. As well, a >> neutron powder pattern took a whole week to collect, and the local >> Electrologica-X1 >> computer <https://ub.fnwi.uva.nl/computermuseum/X1.php> was less >> powerful than the IBM-1620 - and programmed in Algol. It was there and >> then that the brilliantly simple but profound idea arose of refining the >> crystal structure together with the parameters describing the peak >> positions and profiles all together, as published in the famous 1969 paper. >> >> >> >> Rietveld H M (1969) Journal of Applied Crystallography 22 65-71 >> <http://scripts.iucr.org/cgi-bin/paper?a07067> >> >> “A profile refinement method for nuclear and magnetic structures” >> >> >> >> Hugo distributed his Algol refinement program >> <http://www.iaea.org/inis/collection/NCLCollectionStore/_Public/46/087/46087996.pdf> >> widely, but very few papers were initially published using the method. >> Discouraged by the limited funding available for neutron diffraction, he >> successfully applied to become head of the library department at Petten. >> >> >> >> One of us (AH), who had also completed his Ph.D. at Lucas Heights in 1970 >> and who had moved to Harwell, encountered the same problems with neutron >> diffraction for structural transitions. On the advice of George Bacon, AH >> visited Hugo in 1971 and brought back Hugo's new Fortran-II version of the >> profile refinement program. A Harwell version >> <http://hewat.net/science/papers/1973_The_Rietveld_Program_for_the_Profile_Refinement_of_%20Neutron_Diffraction_Powder_Patterns_AERE_R7350-von_Dreele_annotations.pdf>, >> modified to model the anisotropic vibrations preceding structural >> transitions, was very successful, both at Harwell and with Brian Fender's >> students at Oxford, in particular Tony Cheetham and Bob von Dreele. >> >> >> >> In 1973, when the UK joined the EEC and AH moved to ILL in Grenoble, >> another Oxford student (WIFD) performed his first neutron powder >> experiments on AH's new D1A high resolution diffractometer, where a powder >> pattern took only one day to collect, and later only one hour. Again this >> work was very successful, and the number of papers using what Terry Sabine, >> in 1978, christened the "Rietveld Method" exploded, supported by new >> computer programs including those of the early Oxford-Grenoble champions >> Bob von Dreele and Juan Rodriguez-Carvajal. Yet it was not until 1977 that >> R.A. Young and colleagues applied the method to X-ray powder diffraction, >> leading to further rapid growth in the number of publications. Thousands of >> X-ray publications using Rietveld Refinement are now published every year. >> >> >> >> Perhaps the greatest acknowledgement of Hugo’s work was his receipt of >> the 1995 Aminoff Prize, awarded by the Royal Swedish Academy of Sciences, >> Two of us (AH and WIFD), along with Juan Rodriguez-Carvajal and Ivar >> Olovsson, were there to witness Hugo, accompanied by his wife and children, >> receive his accolade from the King of Sweden with typical modesty, delight >> and genuine astonishment at the pervasive influence of his Method across >> the sciences around the world. And beyond the world - in December 2012 he >> was thrilled to receive an e-mail from David Blake of the CheMin team of >> the Mars Science Laboratory rover, Curiosity, who wrote saying that *he >> did not think they could have convinced NASA to send an X-ray powder >> diffractometer to Mars without the Rietveld Method*. >> >> >> >> After almost 50 years, the Rietveld Method has returned to its origins in >> the Netherlands, with the third of us (LvE) completing a fast new high >> resolution neutron powder diffractometer (PEARL) on the Delft reactor. Hugo >> Rietveld lived to see that, and last year was the guest of honour at the >> opening of this new diffractometer. He, who had been honoured throughout >> the world for his achievement, was honoured in his own country by a new >> generation working with neutron powder diffraction and Rietveld Refinement. >> >> >> >> Having achieved all of that, and with a loving family and friends, he >> will surely rest in peace. >> >> Alan Hewat (AH), Bill David (WIFD) and Lambert van Eijck (LvE) July 2017 >> >> ______________________________________________ >> >> * 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/ >> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ >> >> >> >
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