Three-Particle Correlations in Simple Liquids

Details Three-Particle Correlations in Simple Liquids Three-Particle Correlations in Simple Liquids

2003-05-08

arxiv.org/abs/cond-mat/0305176v2

Physics

Condensed Matter

Soft Condensed Matter

4 pages, submitted to PRL, experimental paper, 2nd version: Fig.1 and two new paragraphs have been added

Scientific paper

10.1103/PhysRevLett.91.115502

We use video microscopy to follow the phase-space trajectory of a two-dimensional colloidal model liquid and calculate three-point correlation functions from the measured particle configurations. Approaching the fluid-solid transition by increasing the strength of the pair-interaction potential, one observes the gradual formation of a crystal-like local order due to triplet correlations, while being still deep inside the fluid phase. Furthermore, we show that in a strongly interacting system the Born-Green equation can be satisfied only with the full triplet correlation function but not with three-body distribution functions obtained from superposing pair-correlations (Kirkwood superposition approximation).

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