# Observation of Non-Fluorescent Molecules by Laser-Induced Grating $Spectroscopy^{\ast}$

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 Title: Observation of Non-Fluorescent Molecules by Laser-Induced Grating $Spectroscopy^{\ast}$ Creators: Dunlop, James R.; Rohlfing, Eric A. Issue Date: 1993 Publisher: Ohio State University Abstract: Two-color laser-induced grating spectroscopy (LIGS) is a four-wave mixing technique that has been shown to be a potentially powerful tool for molecular $spectroscopy^{1}$ and photodissociation $dynamics.^{2}$ A distinct advantage of LIGS is that signal generation requires only molecular absorbance. While LIF is a tremendous weapon in the arsenal of the molecular spectroscopist, it is limited to molecules that fluoresce with reasonable quantum yield. Many important combustion radicals and large aromatic molecules do not fluoresce. We present the results of a model study aimed at exploring the use of LIGS to observe non-fluorescent molecules. We demonstrate that molecules that predissociate or experience other rapid nonradiative decay can, in many instances, be probed using this technique. Description: $^{\ast}$Work supported by the U. S. Department of Energy, Office of Basic Energy Sciences, Chemical Sciences Division. $^{1}$. T. J. Butenhoff and E. A. Rohlfing, J. Chem. Phys., in press (1993). $^{2}$. T. J. Butenhoff and E. A. Rohlfing, J. Chem. Phys., in press (1993). Author Institution: Combustion Research Facility, Sandia National Laboratories URI: http://hdl.handle.net/1811/18649 Other Identifiers: 1993-TF-6