Hi everyone, Having noticed that the primary beam in one of our instruments is rather weakfish, I had a look at the monochromator crystal to find that, to my horror, it is severely oxidized. Does anyone of this group know what the best gentle way to get rid of the oxides layer would be? Can one use NH4F to chemically polish Ge like electronics people do with Si? Thanks for any comments, AlexY Dr. Alexandre F. T. Yokochi Assistant Professor (Senior Research) Director, X-ray Crystallographic Facilities Department of Chemistry Oregon State University Corvallis, OR 97331-4003 Ph# (541) 737-6724 Email: [EMAIL PROTECTED] Fax# (541) 737-2062 Web Page: crystal.chem.orst.edu/~alexy (temporarily unavailable)