Please see the following message from Apurva Mehta. If like him you receive messages but cannot post to the Rietveld list, it is not because you are being punished, but because your current "From" email address does not correspond exactly to your registered email address. In that case simply re-register by sending a message "SUBscribe Rietveld_L@ill.fr Your Name" to <[EMAIL PROTECTED]>. You may not be registered immediately because sometimes I am asleep. Glad to see so many people have strong feelings about plotting in Q-space :-) Alan.
At 04:38 22/02/2007, Apurva wrote: >Dear Alan, > >I wanted to post the following message to the discussion of powder scan in Q >space, but the Rietveld list rejected the message. > >Will you please post it for me? Thanks. Apurva >................................ > >This is an issue beyond just plotting of data. > >There is a distinct advantage in collecting powder data in constant Q steps >instead of const 2th space. > > (Peaks are broader at higher 2th and hence the resolution selected for > covering the low angle,sharper peaks is excessive for high angle peaks. >Collection in Q space levels out this discrepancy a little.) > >I do collect all my data in Q space. GSAS can read constant Q step data - >though it converts it to 2th for plotting and analysis. >My 2-cents worth.... >-- >*********************************************************************** >Apurva Mehta >SSRL/SLAC Stanford University >Bldg. 137, MS 69, 2575 Sand Hill Rd. >Menlo Park, CA 94025-7015 >(650) 926 4791, (650) 926 4100 - FAX >*********************************************************************** _____________________________________________________________ Dr Alan Hewat, ILL Grenoble, FRANCE<[EMAIL PROTECTED]>fax+33.476.20.76.48 +33.476.20.72.13 (.26 Mme Guillermet) http://www.ill.fr/dif/people/hewat/ _____________________________________________________________
