Dear Rietvelders, I have a question about how to estimate particle/domain size from GSAS refinement. The manual gives a very simple equation p=(DIFC)*K / sqrt(8ln2*sig-2), saying that there is no instrument broadening for sig-2, which I don't know whether it's right or not because in the instrument file sig-2 is not zero. My question is some peaks cannot be identified, and they have different profile, so I refine these peaks in rawplot, using profile #3. Yet there are only 6 parameters refined, #5 is called <sig>. I don't know how this parameter is related with sig-2 in the profile. Thanks a lot for your suggestions. Sincerely, Ling Yang Dept of CME, Univ of Cincinnati Current address: Bldg 8600, MS 6460 SNS, Oak Ridge National Laboratory Oak Ridge, TN 37830 Tel: 865 574 0350 Fax: 865 241 5991
