Thank you for you suggestion, but I'd need a further explanation, if you are experienced with Fullprof.
The manual states: - at pg 53 (Debye-Scherrer geometry): "Monochromator polarisation correction (Cthm and K in LINE 4)" and then "For synchrotron radiation, K must be given (K=0.1)" - at pg. 76: "Cthm - coefficient for monochromator polarisation correction" and then "Rpolarz - polarisation factor" It is not clear to me if the value that you suggest to me (~ 1) is Rpolarz and if Cthm correspond to K and must setted equal to 0.1, since an input referred to as K is not present in the input PCR file. Thank you for your attention, best regards, Alberto At 18.02 24/11/2004 +0100, you wrote: >Alberto, > >Check you have the right polarisation correction. Synchrotron ~ 1, >laboratory typically 0.5 with no mono... > >HTH, > >Jon > >Alberto Martinelli wrote: > >>Dear all, >> >>I've got a problem with the Rietveld refinements of synchrotron data. >>I'm using Fullprof and the problem is that the overall B, and then also >>some of the isotropic displacement parameters, fall down to negative >>values. I'm not very experienced in the treatment of synchrotron data and >>may be I put some errouneous input in the PCR file, but I cannot understand >>what. >> >>Thanks in advance for your helpful suggestions, best regards >> >>Alberto Martinelli >> >> >> >> > >
