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We study numerically the evolution of the velocity distribution of atomsunder the action of the bichromatic force. The comparison of the timedependencies of the distribution width and the average acceleration of atomsreveal the correlation of these quantities. We show that the estimation of themomentum diffusion coefficient on the basis of the analogy between theinteraction of atoms with the counter-propagating bichromatic waves and theinteraction of atoms with the counter-propagating sequences of the $\pi$-pulsesroughly corresponds to the results of numerical calculations. To separate theinfluence of the momentum diffusion on the evolution of atomic momentumdistribution from the influence of the time-dependent Doppler shift, we studythe motion of a ``heavy'' atom, for which the velocity change during theinteraction of an atom with the field can be neglected. Provided that theparameters of the atom-field interaction are optimal, we show that the momentumdiffusion coefficient is proportional to the intensity of the laser radiation.We used the Monte Carlo wave-function method for the numerical simulation ofthe atomic motion.

Evolution of the velocity distribution of atoms under the action of the bichromatic force