Heterodyne coincidence spectroscopy
- 1 December 1976
- journal article
- research article
- Published by Taylor & Francis in Molecular Physics
- Vol. 32 (6) , 1695-1702
- https://doi.org/10.1080/00268977600103011
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.Keywords
This publication has 3 references indexed in Scilit:
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- Experimental study of the triplet correlation function for simple liquidsJournal of Physics C: Solid State Physics, 1971
- Kinetic equations and time correlation functions of critical fluctuationsAnnals of Physics, 1970