STUDIES OF LOCAL ORDER IN FLUID STATES BY CROSS CORRELATION INTENSITY FLUCTUATION SPECTROSCOPY
Résumé
A formal expression is presented in terms of multi-particle correlation functions for the cross-correlation intensity fluctuation (CCIFS) function. This expression is examined in several limits and is seen to be related to a variety of correlation functions which describe present or proposed experiments. Evidently the full CCIFS function is required to understand recent CCIFS experiments for small scattering volumes containing strongly correlated particles. However, the full CCIFS function is rather complex and a two dimensional hard disk system is investigated by computer simulation to gain better insight. It is found that the resulting CCIFS functions must include three and four particle correlation functions, in general, to give accurate representation of the CCIFS correlation function. A model calculation is reviewed and possible uses of the CCIFS technique are discussed.
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