W0119

Rapid Acquisition Pair Distribution Function Analysis (RA-PDF); Application to Time Resolved Structural Studies. Peter J. Chupas,^a Xiangyun Qiu,^b Jonathan C. Hanson,^c Peter L. Lee,^d Simon Billinge^e and Clare P. Grey^a, ^aDept. of Chemistry, State Univ. of New York at Stony Brook; ^b Dept. of Physics and Astronomy, Michigan State Univ., ^cChemistry Dept., Brookhaven National Laboratory, ^dAdvanced Photon Source, Argonne National Laboratory.

Recently there has been a push to characterize the structure of technologically important nano-crystalline and disordered materials on atomic length scales by using the atomic pair distribution function (PDF) method.[1] This method makes use of both the diffuse and Bragg scattering components [2], and proves an attractive method when powder diffraction patterns prove difficult to analyze by using the more traditional Rietveld method. Recently we have utilized two dimensional image plate (IP) detectors for PDF measurements, and have decreased the measurement time needed for high real space resolution PDF measurements by three orders of magnitude: allowing measurements to be made on the order of seconds. The implementation of IPs to PDF measurements requires several experimental corrections to be accounted for, which include both geometrical considerations and the response of the IP to incoherent scattering.[3] Experiments that exploit the data collection rates are currently being performed.

[1] V. Petkov, E. Bozin, E., S.J.L. Billinge, T. Vogt, P. Trikalitis, M. Kanatzidis, (2002). J. Am. Chem. Soc., 124, 10157-10162.

[2] Egami, T., Ed. Local Structure From Diffraction; Plenum: New York, 1998.

[3] P.J. Chupas, X. Qiu, P.L. Lee, J.C. Hanson, Clare P. Grey, Simon J.L, Billinge, in preparation.