Dear all, The following paper describes 'element specific maps', calculated by collecting data immediately above and below an absorption edge.
http://journals.iucr.org/d/issues/2005/05/00/he5321/index.html I have used this technique, and it works very well. If anyone is interested I have a set of scripts to take raw mosflm data, scale it and calculate these maps. best wishes James -- Dr. James W. Murray David Phillips Research Fellow Division of Molecular Biosciences Imperial College, LONDON Tel: +44 (0)20 759 48895 ________________________________________ From: CCP4 bulletin board [CCP4BB@JISCMAIL.AC.UK] on behalf of Jacob Keller [j-kell...@fsm.northwestern.edu] Sent: Wednesday, July 06, 2011 5:46 PM To: CCP4BB@JISCMAIL.AC.UK Subject: [ccp4bb] Map Using Both Bijvoet and Dispersive Differences with Model Phases Dear Crystallographers, it seems to me that for clearly identifying/characterising anomalous scatterers for a solved structure, one could make a map using two datasets: one at the f" peak, one low energy remote. One would then use the signal both from the Bijvoet differences in the peak dataset plus the differences between the peak and low-energy datasets, which I think I have seen called "dispersive" differences. I guess this would be like a MAD map, but using pre-existing model phases--is there such an animal in the software, or would it even be helpful? Jacob Keller -- ******************************************* Jacob Pearson Keller Northwestern University Medical Scientist Training Program cel: 773.608.9185 email: j-kell...@northwestern.edu *******************************************
