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    Reconstruction of the orientational pair correlation function from neutron diffraction data: the case of liquid hydrogen iodide

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    An analysis of partial-structure-factor information on molecular liquids is described which uses the spherical harmonic expansion of the site-site structure factors to extract an estimate of the orientational pair-correlation function between molecules. Recently published neutron-diffraction data on the site-site partials in liquid hydrogen iodide at 210 K are used as the input data to this technique. The results, which are presented as a map of the orientational pair-correlation function, g(r,omega1,omega2), show the occurrence of pronounced relative orientational correlations between molecules at this temperature, even though the same orientations are apparently only weakly correlated with the molecular center of mass. The same spherical harmonic expansion procedure can be applied to a number of other molecular liquids where diffraction data are available

    Going Beyond Counting First Authors in Author Co-citation Analysis

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    The present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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