Abstract
Experimental investigations of the thermal diffusion motion of individual probe microparticles in various liquids have been carried out by using the phase-sensitive laser method of light-scattering spectroscopy. It has been shown that at observation times τ ≥ 1s there is a good agreement between the obtained experimental data and the well-known Einstein-Smoluchowski linear law of Brownian motion (see manuscript for equation). At small observation times τ<<1 s, the square law of motion (see manuscript for equation) is valid. The molecular cooperative mechanism of action of the liquid on a microparticle as a result of relaxation of thermal spatial inhomogeneities is discussed.
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