For MIR, you also need to weigh your options. If you want to use anomalous signal for SIRAS/MIRAS, you may want to be above the most prominent or at least a useful edge of your HA. On the other hand, being above an HA edge increases you chance of serious radiation damage. Sometimes you may need to back-soak. For light atoms, higher energy generally means less absorption. All depends on many details which you do not provide.
BR -----Original Message----- From: CCP4 bulletin board [mailto:[email protected]] On Behalf Of Theresa H. Hsu Sent: Monday, February 13, 2012 1:02 PM To: [email protected] Subject: [ccp4bb] Choice of wavelength Hi all. When collecting data, is there a specific wavelength to be chosen at synchrotron source? Does it make difference between 0.9 and 1.5 A, for example? I know it is important for SAD/MAD but how about MIR? Thank you. Theresa
