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We have detected and analyzed narrow, high contrast coherent populationtrapping resonances, which appear in transmission of the probe monochromaticlight beam under action of the counterpropagating two-frequency laserradiation, on example of the nonclosed three level {\Lambda}-system formed byspectral components of the Doppler broadened D2 line of cesium atoms (in thecell with the rarefied Cs vapor). These nontrivial resonances are determineddirectly by the trapped atomic population on the definite lower level of the{\Lambda}-system and may be used in atomic frequency standards, sensitivemagnetometers and in ultrahigh resolution laser spectroscopy of atoms andmolecules.

High contrast resonances of the coherent population trapping on sublevels of the ground atomic term