Nonlinear Spectroscopy

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Science  20 Oct 1972:
Vol. 178, Issue 4058, pp. 247-255
DOI: 10.1126/science.178.4058.247


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 reproduced in the optical region, and with the same precision and detail.