Hold that thought. On closer examination of the difference plot at high angles you have something that looks like sample displacement, and refining it improves the fit, although the values for zero point and shift become quite large. Mirrors shouldn't give you this kind of error so make sure it's properly aligned and if it's an old retrofitted theta-theta system, make sure that your goniometer worm gears aren't getting slack.
Pam -----Original Message----- From: ruggeri [mailto:[EMAIL PROTECTED] Sent: June 29, 2006 10:45 AM To: rietveld_l@ill.fr Hello all, Has anybody tried to perform Rietveld analysis on LaB6 with twin copper source in /2 / configuration (Goebel mirror)? If yes, can anybody help me on fitting this standard LAB6 (profile function, tips...). Regards. Stéphane Ruggeri, Ph.D. Stagiaire post-doctoral INRS Énergie, Matériaux et Télécommunications 1650, boul. Lionel-Boulet Varennes (Québec) J3X 1S2 Téléphone/Office : (450) 929 8139 Télécopieur/Fax : (450) 929-8198
