Hi everybody, Nobody is trying to be prickly (at all)!
The topic has been started with particular case for Panalytical machines, and, again, a 'minute quote' from archive: "This is obtain from the help of X'Pert HighScore Plus..." As the first instance question is so the same kind of answer is coming... And I would never made a feedback if I was not curious to the topic too. I remember following branch clearly: http://www.mail-archive.com/rietveld_l%40ill.fr/msg04948.html And to be really pricky and boring=), see http://www.mail-archive.com/rietveld_l%40ill.fr/msg04979.html That makes me think again that there is nothing new under the sun... Between, I like to send postcards=) Cheers, Artem 07.04.2014 19:00, "Whitfield, Pamela S." <whitfiel...@ornl.gov> >Now, now no need to be prickly > > To be fair to Julian he didn't ask what the polarization was - he asked how > it was calculated. Given that Goebel mirrors are graded multilayers (i.e. not > a fixed diffracting angle) it's a fair question and one I asked myself in > 2001. As the 'minute quote' demonstrates with the lack of d-spacing, etc, the > value of 0.999 seems to have been picked from thin air > > The experimental (as opposed to theoretical) methodology for determining > polarization was posted on the CCP14 website many moons ago by Bob Von Dreele > http://www.ccp14.ac.uk/solution/gsas/graphite_monochromator_and_gsas.html > > I also used the same sort of methodology for a focusing mirror. That requires > a little bit of lateral thinking to cancel out the effect of capillary > absorption - answers on a postcard! > > Pam > > -----Original Message----- > From: rietveld_l-requ...@ill.fr [mailto:rietveld_l-requ...@ill.fr] On Behalf > Of Artem Babaryk > Sent: Sunday, 06 April, 2014 4:21 PM > To: Julian R Tolchard > Cc: rietveld_l@ill.fr > Subject: Re[2]: Polarization factor por Ge (111) monochromator > > Dear Julian, > > Here is a minute quote following the link to the excerpt from the Rielveld > Mailing list archive I've posted below: > > "Monochromator Wavelength [Å] Material Reflection /d/-spacing [Å] 2/θ/_m [°] > POL ... > All mirrors All wavelengths - - - - 0.999 > " > Just be attentive... > > Cheers, > Artem > > 06.04.2014 23:00, Julian R Tolchard <julian.r.tolch...@ntnu.no> > >Whilst we are on the topic - is the polarization factor from a Göbel mirror > >calculated the same way as for a mono? > > > > > > ________________________________________ > > From: rietveld_l-requ...@ill.fr [rietveld_l-requ...@ill.fr] on behalf > > of Artem Babaryk [baba...@bigmir.net] > > Sent: 06 April 2014 20:56 > > To: Josu Friedrich > > Cc: rietveld_l@ill.fr > > Subject: Re: Polarization factor por Ge (111) monochromator > > > > Dear Josu, > > > > Somethimes browsing the Rietveld list archive I'm strengthening myself > > that there is nothing new under the sun... > > > > So, look there: > > > > http://www.mail-archive.com/rietveld_l%40ill.fr/msg05129.html > > > > Best, > > Artem > > > > 06.04.2014 20:11, Josu Friedrich <josue.friedr...@gmail.com> > > >Good afternoon, > > > > > > Does anyone know the polarization factor for an incident beam germanium > > > (111) monochromator used in a Panalytical XPert Pro diffractometer? > > > > > > Many thanks, > > > Josue
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