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We perform detailed analysis of sub-Doppler cooling limits for various atomsby direct solving quantum kinetic equation for atom density matrix instanding-wave light field generated by counterpropagating waves. It wasdemonstrated that the polarization gradient cooling effects are sensitive toatom recoil parameter (the ratio of recoil energy to natural linewidth) thatresults to limitation of sub-Doppler cooling and allows to outline the limitsof well-known sub-Doppler cooling theory. We also give a comparison the coolinglimits for well-known $\sigma_+-\sigma_-$ and $lin\perp lin$ configurations.

Limits of sub-Doppler cooling for atoms with various recoil parameter