Heterodyne coincidence spectroscopy |
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Authors: | George DJ Phillies |
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Institution: | Department of Chemistry , University of California , Los Angeles, California, 90024 |
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Abstract: | A new type of light-scattering experiment, which should measure directly the triple static structure factor S (3) (k, q) of a fluid, is proposed. S (3)(k, q) is the full spatial Fourier transform of the equilibrium triplet distribution function g (3)(r 1, r 2, r 3). The experiment may also be used to study dynamic correlation functions of the form <ak (t)aq (t′)a_k_q(t″)> (where ak () is the kth spatial Fourier component of the density), thereby giving new information on mode-mode coupling. The method obtains its information from triple correlations in the arrival of scattered photons at three detectors. The detectors must be operated in the heterodyne mode (i.e. with a local oscillator); the scattering volume must be much larger than the volume over which molecular positions are correlated. Comparison is made with previous analyses of other multi-detector experiments. |
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