State-to-state studies of intramolecular dynamics

Thomas R. Rizzo; Xin Luo; Rebecca D. F. Settle

doi:10.1117/12.58156

1 April 1992 State-to-state studies of intramolecular dynamics

Thomas R. Rizzo, Xin Luo, Rebecca D. F. Settle

Proceedings Volume 1638, Optical Methods for Time- and State-Resolved Chemistry; (1992) https://doi.org/10.1117/12.58156
Event: OE/LASE '92, 1992, Los Angeles, CA, United States

Abstract

Infrared-optical double resonance incorporating vibrational overtone excitation of a light atom stretch mode prepares reactant molecules in single quasibound rovibrational states at energies above their decomposition threshold on the ground potential surface. When combined with laser induced fluorescence detection of the dissociation fragments, this approach permits fully quantum state resolved studies of unimolecular dissociation reactions. This report describes the application of this technique to study the unimolecular dissociation of hydrogen peroxide from a variety of vibrational and rotational states. We emphasize here the spectroscopy associated with the reactant excitation process and demonstrate how highly resolved excitation spectra provide detailed information about the dynamics of the ensuing dissociation. We then describe a new spectroscopic technique for detecting vibrational overtone excitation in low pressure environments based upon selective CO₂ laser infrared multiphoton dissociation of highly vibrationally excited molecules. We show preliminary results applying this approach to CH₃OH.

Citation Download Citation

Thomas R. Rizzo, Xin Luo, and Rebecca D. F. Settle "State-to-state studies of intramolecular dynamics", Proc. SPIE 1638, Optical Methods for Time- and State-Resolved Chemistry, (1 April 1992); https://doi.org/10.1117/12.58156

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