Dear mailing list - my last round of EXAFS experiments performed on the Fe-K edge in fluorescence mode gave data extending nicely to 15 in k. One problem was a nasty monochromator glitch at approx 13.5 in k which is so great in some cases it causes sufficient distortion to the data that even upon deglitching I must cut back the data to 13 in order to gain a good fit using my models. Firstly I was wondering if someone here could describe to me how a monochromator glitch arises (some systematic defect in the monochromator crystal or more? - the only problem with this explanation is that some data sets seem more affected than others and it has not manifested itself as badly in previous trips). Also is there any other way to handle the removal of a monochromator glitch besides deglitching? My supervisor seems to think that there must be a scale factor or offset in the I0 monitor counts which could be corrected in order to overcome a glitch in the existing data - has anyone ever ! thought of other ways to salvage data in this way? Regards, Mark -- Mark Bondin PhD student School of Chemistry, University of Melbourne (03) 8344 7015 (Tower lab) 0409 252 983 (mobile)