Synchrotron Parameter file information for GSASVia Rietveld Mailing List
Date: Tue, 23 May 2000 08:55:26 -0600 To: RIETVELD_L Distribution List [rietveld_l@ill.fr] From: vondreele@lanl.gov (Bob Von Dreele) Subject: Re: Instrument parameter file (GSAS) for ESRF At 08:52 AM 5/9/00 +0200, you wrote: >Hi, > >I am rather new to this community and have few questions >about the use of GSAS to analyze synchrotron data. Since there >is no alpha_2 radiation what the instrument file should look like. >In all the examples I have seen, the k_ratio has been non-zero. >Any help in this matter will be greatly appreciated. > >Thanks >Mohan Menon >Post Doc >Dept. of Chemistry >NTNU, Trondheim, Norway > >menon@chembio.ntnu.no Dear Mohan, Look at the iparm file INST_X3A.PRM in \gsas\examples. That is a typical synchrotron iparm file. Important points are that IRAD=0 (non standard radiation), LAM2=0 (no Ka2) and POLA=0.95 (typical polarization for synchrotron radiation). KRATIO is ignored if LAM2=0. Bob Von Dreele |