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The Bloch equations for the macroscopic polarization components P r  and P i  and the population difference ⊿N of a two-level system are derived with inclusion of diagonal elements of the electric dipole moment operator. The influence of such elements on the solutions is discussed. The effect of Stark-switching technique on the observed transient emission signal is considered.

Microwave Transient Phenomena of Symmetric Top Molecules. An Extended Bloch Type Description