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ABSTRACT: The radial distribution function (RDF) of liquid water has been determined by x-ray scattering. Using a free-standing water jet and a diffracted beam analyzer to separate the Compton from the elastic scattering experimentally, several significant sources of error have been eliminated in the experiment. These have enabled the collection of quality data out to 19.7 A(-1). Data were collected both at 278 K and at 296 K. Our RDF presents fine structure, particularly, a distinct peak at 3.4 A and a peak split at 4.5 A. These features cannot be interpreted by a simple tetrahedral configuration suggested by continuum models. The uncertainties due to the truncation effects and the choice of scattering factors are found to have little influence on the RDF at intermolecular distances.
The Journal of chemical physics 12/2009; 131(23):234702. · 3.09 Impact Factor
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Arthur Bienenstock
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ABSTRACT: Following a brief review of its properties, discussions are presented of the application of synchrotron radiation to: (a) the determination of atomic arrangements using extended x-ray absorption fine structure (EXAFS); (b) the determination of atomic arrangements using x-ray anomalous scattering; (c) dynamic small angle x-ray scattering; (d) x-ray lithography and microscopy; (e) the determination of surface electronic states using vacuum ultraviolet radiation; (f) time resolved fluorescence from protein molecules.
IEEE Transactions on Nuclear Science 07/1979; · 1.45 Impact Factor
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ABSTRACT: Anomalous X-ray scattering (AXS) has been used to obtain Mo–Ge, Mo–Mo and Ge–Ge partial pair distribution functions (PPDFs) from amorphous MoGe3 which has no crystalline analog. Experimental removal of inelastic scattering over much of the scattering range has yielded considerably improved PPDFs motivating still further optimization of the experimental system. The PPDFs indicate that on average Mo is surrounded by eight Ge atoms as in crystalline β-MoGe2. The PPDFs do not indicate phase separation. Other aspects of the structure are discussed.
Journal of Non-Crystalline Solids · 1.54 Impact Factor
