Dear Björn, Since the Goebel mirror uses diffraction it should require the same polization factor than a crystal monochromator.
http://www.ccp14.ac.uk/ccp/web-mirrors/dirdif/xtal/documents/equipment/d8/accessories/goebel.html you can get the equations from: http://reference.iucr.org/dictionary/Lorentz%E2%80%93polarization_correction Hope this helps, Leo 2015-06-03 10:39 GMT-03:00 Matthey, Björn <[email protected] >: > Dear all, > > > > what is he right factor in case of a laboratory diffractometer with " sealed > tube or rotating anode source" and especially for a goebel mirror? > > > > Thank you in advance > > > > Björn Matthey > > > > -- > > > > Mit freundlichen Grüßen | Best Regards > > Björn Matthey > > > > Fraunhofer-Institut für Keramische Technologien und Systeme, IKTS Dresden > > Dipl.-Ing. Björn Matthey > > Keramografie, Phasenanalyse / Ceramography, Phase Analysis > > Winterbergstraße 28, 01277 Dresden, Germany > > Telefon +49 351 2553-7973 > > Fax +49 351 2554-280 > > mailto: [email protected] > > http://www.ikts.fraunhofer.de > > > > *Von:* [email protected] [mailto:[email protected]] *Im > Auftrag von *Leopoldo Suescun > *Gesendet:* Mittwoch, 3. Juni 2015 15:31 > *An:* Davide Levy > *Cc:* [email protected] > *Betreff:* Re: polarization > > > > Dear Davide, > > > > The polarization factor depends on the incident X-rays not on the type of > detector. > > If your radiation comes from a sealed tube or rotating anode source > without monochromator there is no polarization of light and the factor is > 0.5, the use of a filter does not change the polarization state. > > If you have an incident beam monochromator it depends on the material of > the monochromator (or better on the diffraction angle). > > If you are using synchrotron radiation you will need something in the > range 0.95 to 1 depending on the optics of the beamline. > > I hope this helps, > > Leo > > > > > > 2015-06-03 5:56 GMT-03:00 Davide Levy <[email protected]>: > > Hi to everybody, > > Which polarization correction is better to use in GSAS for data collected > with a linear detector without monochromator? > thanks > > Davide > > > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > Please do NOT attach files to the whole list <[email protected] > > > Send commands to <[email protected]> eg: HELP as the subject with no body > text > The Rietveld_L list archive is on > http://www.mail-archive.com/[email protected]/ > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > > > > > > -- > > Dr. Leopoldo Suescun > Prof. Agr (Assoc. Prof.) de Física Tel: (+598) 29290705/29249859 > Cryssmat-Lab./Cátedra de Fisica/DETEMA Fax: (+598) 29241906* > Facultad de Quimica, Universidad de la Republica. Montevideo, Uruguay > > > Ahora la cristalografía importa más (www.iucr.org) Crystallography > Matters more. > -- Dr. Leopoldo Suescun Prof. Agr (Assoc. Prof.) de Física Tel: (+598) 29290705/29249859 Cryssmat-Lab./Cátedra de Fisica/DETEMA Fax: (+598) 29241906* Facultad de Quimica, Universidad de la Republica. Montevideo, Uruguay Ahora la cristalografía importa más (www.iucr.org) Crystallography Matters more.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Please do NOT attach files to the whole list <[email protected]> Send commands to <[email protected]> eg: HELP as the subject with no body text The Rietveld_L list archive is on http://www.mail-archive.com/[email protected]/ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
