Infrared free-electron-laser photolysis of CFCl{sub 3} and CF{sub 2}Cl{sub 2}

Journal Article · Thu Jan 02 04:00:00 EST 1997 · Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment, amp General Theory

DOI:https://doi.org/10.1021/jp961739r· OSTI ID:502023

Lyman, J L; Newnam, B E; Early, J W ^[1]

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1. Los Alamos National Lab., NM (United States)

A tunable infrared free-electron laser comprised of a train of picosecond pulses was utilized to destroy the Freons CFCl{sub 3} and CF{sub 2}Cl{sub 2} by multiple-photon dissociation. The experiments explored the effects of laser frequency, laser fluence, spectral bandwidth, frequency chirping, reactant partial pressure, and oxygen (or air) partial pressure. We determined the optimum laser frequencies for dissociation of both of the Freons and also showed that a broader spectral bandwidth laser enhances reaction. A strong reduction of dissociation fraction with increasing pressure made infrared photodissociation of Freons at near atmospheric pressure difficult. Improvement of the high-pressure photolysis would require a laser macropulse much shorter than the 2 {mu}s used in these experiments. 32 refs., 9 figs., 1 tab.

• OSTI ID: 502023
• Journal Information: Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment, amp General Theory, Journal Name: Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment, amp General Theory Journal Issue: 1 Vol. 101; ISSN 1089-5639; ISSN JPCAFH
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
CHLOROFLUOROCARBONS
DISSOCIATION
FOURIER TRANSFORM SPECTROMETERS
FREE ELECTRON LASERS
FREONS
INFRARED SPECTRA
NUMERICAL DATA
OPTIMIZATION
PHOTOCHEMISTRY
PHOTOLYSIS