[GSAS-II] GSAS 2 inquire

[Wei Liu]

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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.aps.anl.gov/pipermail/gsas-ii/attachments/20170615/4da18e46/attachment.html>