We present a detailed theoretical study of a method for slowing light based on the oscillations of Zeeman coherences in a double two-level system [Hashmi, F.A.; Bouchene, M.A. _Phys. Rev. A_ 2008, _77_, 051803(R)]. This method does not require the presence of any trapping state. We focus on the properties and the limitations of such a method and compare it ... إقراء المزيد