Perfect following in the diabatic limit.

@article{Sawicki1999PerfectFI,
  title={Perfect following in the diabatic limit.},
  author={Dariusz Sawicki and J Patrick Eberly},
  journal={Optics express},
  year={1999},
  volume={4 7},
  pages={217-22}
}
We present the theory of optical excitation of a two-level quantum system, using an interaction Hamiltonian that permits both adiabatic following and diabatic following.