  Specific types of atomic coherences between Zeeman sublevels can be generated
and detected using a method based on nonlinear magneto-optical rotation with
frequency modulated light. Linearly polarized, frequency modulated light is
employed to selectively generate ground-state coherences between Zeeman
sublevels for which $\Delta m=2$ and $\Delta m=4$ in $^{85}$Rb and $^{87}$Rb
atoms, and additionally $\Delta m=6$ in $^{85}$Rb. The atomic coherences are
detected with a separate, unmodulated probe light beam. Separation of the pump
and probe beams enables independent investigation of the processes of creation
and detection of the atomic coherences. With the present technique the transfer
of the Zeeman coherences, including high-order coherences, from excited to
ground state by spontaneous emission has been observed.
