Nonlinear spectroscopy.

@article{Brewer1972NonlinearS,
  title={Nonlinear spectroscopy.},
  author={R G Brewer},
  journal={Science},
  year={1972},
  volume={178 4058},
  pages={247-55}
}
Although nonlinear spectroscopy evolved slowly in its initial stages, it is now becoming an important new branch of atomic and molecular spectroscopy. A variety of phenomena are being observed for the first time, either in steady state or in transient behavior. In a sense, the methods of microwave and nuclear magnetic resonance spectroscopy are now being… CONTINUE READING