Abstract
The narrow and high-contrast spectra induced by the interacting dark resonances (IDR) were analyzed. The spectra were measured with cold 87 Rb atoms produced by a magneto-optical trap. A coupling laser and a weak probe laser formed electromagnetically induced transparency (EIT) configuration. Microwave drived a magnetic-dipole transition between the fourth level and the ground state which was coupled with the excited state by the coupling laser. The spectral profile of probe absorption exhibited sharp peak emergence inside the narrow EIT dip.