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Matthias Zebisch wrote: > Dear bb! > > What is the optimal wavelength for Sulfur SAD phasing? > Is it 1.9A or should one go below that to reduce absorption/damage. > > Also, would the same wavelength be appropriate to maximize anomalous > scattering to position chlorides, calcium, sulfate in already phased > structures? > > Thanks in advance, > > Matthias > > Hi, The Sulphur absorption edges are way too far for realistic data collection (can't remember the precise values right now). But Sulphur SAD can even be done on a home source (Cu K-alpha), see eg http://www.stoe.com/pages/brochure/Genix%20Cu%20labnote.pdf there the precision of measurements is very important. Fred.