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Science 3 November 2006:
Vol. 314. no. 5800, pp. 821 - 825
Until now, the precise structure of Mn4Ca has eluded all attempts of determination by x-ray diffraction and other spectroscopic techniques, in part because the metal catalyst is highly susceptible to radiation damage. To minimize radiation damage, the team used a novel combination of x-ray absorption fine structure spectroscopy measurements and x-ray diffraction data from crystallographic studies obtained at SSRL where the techniques used in this study were developed in collaboration with the LBNL scientists. This technique exposes the Mn4Ca cluster to much lower doses of radiation, and enabled the team to obtain three similar structures at a resolution much higher (~0.15 Å) than previously possible.
SLAC Today, November 29, 2006