Acknowledgments

We are indebted to Drs Kevin Wilkinson and Jacques Buffle for numerous stimulating discussions. This work was funded, in parts, by grants from NSF (#9906823 and #0210865), and the Texas Institute of Oceanography. XAS experiments were performed at the Advanced Photon Source, Sector 5, on the DND-CAT bending magnet beam-line that is supported by the E.I. DuPont de Nemours & Co., the Dow Chemical Company, the NSF through Grant DMR-9304725, and the State of Illinois through the Department of Commerce and the Board of Higher Education Grant IBHE HECA NWU 96. DOE-BESunderContractNo.W-31-102-Eng-38 supported useoftheAPS.

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