LASER SPECTROSCOPY OF EXOTIC CHEMICAL SPECIES: TRANSIENT, WEAKLY BOUND, REACTIVE, AND SURFACE ADSORBED MOLECULES

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1990

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Ohio State University

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Using laser spectroscopic techniques such as Stimulated Emission Spectroscopy and Stark Level Crossing Spectroscopy, in combination with molecular beam techniques, we can now study vibrational levels from 0 to $10^{4} cm^{-1}$ with sub-Doppler resolution and single rotational level selectivity, for molecules with concentrations as low as $10^{-4}$ Torr. Low frequency intermolecular vibrational levels in a weakly bound complex can be directly observed for the elucidation of intermolecular forces. Short-lived radicals can be studied at high vibrational excitation. The reaction of a molecule with vibrational energy higher than dissociation barrier can be examined with single quantum state resolution. Furthermore, application of nonlinear optical techniques such as second harmonic generation allows us to probe the spectroscopy, structure, and energy transfer dynamics of the surface layer of atoms and molecules adsorbed on surfaces.

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Author Institution: Department of Chemistry, University of Pennsylvania, Philadelphia

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