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Published April 1977 | Published
Journal Article Open

New Laser Techniques for Time-Resolved Spectroscopy

Zewail, A. H.


A novel spectroscopic tool is presented for measuring the incoherent resonance decay (IRD) of selectively (6 MHz) prepared electronic states. The method utilizes electro-optic switching of a single laser mode that is on or off resonance with respect to the homogeneous molecular packets in the excited ensemble. The technique is applied to a variety of systems: gases at low and high pressures, molecular beams, and solids at low temperatures. The coherent transient of solids observed in the forward direction of the laser gives the phase memory (optical T2 processes) while the IRD measures directly the radiative and radiationless decay (optical T1 processes), and the optical transition moment between the ground state and the prepared electronic state. The theory of coherent and incoherent states is also given, and related to the different aspects of time-resolved spectroscopy of molecular beams and solids.

Additional Information

© 1977 SPIE. I wish to thank Drs. J. Morris Weinberg and T. Hirschfeld for the invitation to present this work at the 20th Annual Symposium on Optical, Electro-optical, Laser and Photographic Technology (sponsored by the Society of Photo-Optical Instrumentation Engineers, SPIE) in August of 1976. I should point out that without the hard (late hours) work of T. Orlowski, K. Jones, and D. Dawson of this laboratory, this work would never have been completed. This work was supported in part by the President's Venture Fund and in part by the Sloan Foundation.

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