Studies of free radicals by ultraviolet excimer laser photolysis. Progress report, 1 April 1980-1 November 1980 [electronic resource].
- Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 1980.
- Physical Description:
- Pages: 12 : digital, PDF file
- Additional Creators:
- United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- An experimental technique has been developed to produce and directly study vibrationally excited free radicals. Pulses of light from an ultraviolet excimer laser are used to photodissociate small molecules to generate free radicals with high internal excitation. The radicals are detected directly by the technique of time and wavelength-resolved infrared emission spectroscopy using a background-limited copper-doped germanium infrared detector. New results have been obtained on the CH/sub 3/ radical. A complete spectrum of the CH/sub 3/ umbrella band reveals for the first time accurate positions of the vibrational progression in this band. Photofragmentation of (CH/sub 3/)/sub 2/Hg has yielded detailed information on the vibrational distribution, rotational temperature, and deactivation rates of the CH/sub 3/ stretch mode. A technique to study chemical chain reactions using low power, radical-specific, laser initiation and realtime kinetics detection had previously been demonstrated. The results provide a general method to study a large number of chain reaction combustion systems in greater detail. New results on more complex chain reactions such as Cl/sub 2//butane reveal that highly detailed infrared emission spectra of various products of the chain and their time evolution is possible. Partitioning of energy between vibrational degrees of freedom and translational heating is obtained over the course of the combustion.
- Published through SciTech Connect., 01/01/1980., "doe/er/10396-2", Leone, S.R., and Colorado Univ., Boulder (USA)
- Funding Information:
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