On the possible control of the velocity selection of molecules

Possibility of the realization and control of the one-dimensional subrecoil velocity selection of molecules is shown on quantum levels of the open Lam bda -system by means of step and quasi-stationary changes of amplitude and phase parameters of resonance counterpropagating light waves. The photoexci tation of such selected molecules and the adiabatic transfer between the en tangled molecular states of internal and velocity variables are analyzed at corresponding changes of conditions for the coherent population trapping i n the Lambda -system.