Hi, I am a new user of GSAS 2. I am trying to use GSAS 2 by reading the 'Help for GSAS-II'. However, I have some doubts, which cannot be found in this web page. Could someone advice on my questions below? Thanks a lot.
1. In the 'Unit Cells List', what is the 'Max Nc/Nobs 4 Start Volume 25 Use M20/(X20+1)?' What is the function of the refinement to this parameter? 2. In the 'Phase Data'/ 'Atoms' tab, for each of the atoms, there are refinement choices, 'X, XU, U, F, FX, FXU, FU'. May I know what is the difference between these choices? Btw, may I know whether there is a more detailed manual of GSAS 2 besides the 'Help for GSAS-II'? And if a good reference document or book could be recommended for the procedure of using GSAS 2 and the theory (including those important parameters to refine in a normal neutron powder diffraction pattern) for the refinement of a neutron diffraction pattern, it will be very helpful as well. Thank you very much for your help in advance, Best regards, Liu Wei
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