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I note that all three of those atoms should have anomalous scattering and should show up as peaks in anomalous Fourier maps if you collected data carefully enough at multiple wavelengths. The As K edge is 1.04 A, which is easily within reach of most MAD synchrotron beamlines. The Mo peaks are out of range, but you should still see a peak, and could differentiate it from other metals by other methods, such as AAS.

On 07/06/11 05:15, conanΟΙΘΛΦΈΒ· wrote:
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Dear All,

         Hi. I was asked in a manuscript revision to discuss about the possible effects of Fourier transformation ripples on the crystallographic results. Specifically, the reviewers question whether ripples may affect on the electron density around heavy metal center which has a Mo-S-As connection. From which angle or in which way this problem should be addressed most convincingly ?

         Thank you for any suggestion.

Best,
Conan
 


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                               David J. Schuller
                               modern man in a post-modern world
                               MacCHESS, Cornell University
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