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Title: Laser enhanced chemical reaction studies

Abstract

Experimental studies of dynamic molecular processes are described with particular emphasis on the use of a powerful infrared diode laser probe technique developed in our laboratory. This technique allows us to determine the final states of CO{sub 2} (and other molecules) produced by collisions, photofragmentation, or chemical reactions with a spectral resolution of 0.0003 cm{sup {minus}1} and a time resolution of 10{sup {minus}7} sec. Such high spectral resolution provides a detailed picture of the vibrational and rotational states of molecules produced by these dynamic events. We have used this experimental method to probe collisions between hot hydrogen/deuterium atoms and CO{sub 2}, between O({sup 1}D) atoms and CO{sub 2}, to study the final states of DCl molecules produced as a result of the reactions of hot Cl atoms, and to investigate the dynamics of the reaction between OH and CO molecules. Advances in our technique over the past two years have allowed us to identify and study more than 200 final rotational states in ten different vibrational levels of CO{sub 2} encompassing all 3 normal modes, many overtones, and combination states of the molecule. We have extended the technique to probe a variety of new molecules such as OCS, N{sub 2}O,more » DCl, CS{sub 2} and Cl atoms (via the {sup 2}P{sub 3/2} {yields} {sup 2}P{sub 1/2} atomic transition). All of this work is aimed at providing experimental tests for polyatomic molecule potential energy surfaces, chemical transition states in complex systems, and theories of reaction dynamics in molecules with more than 3 atoms. We hope through these experiments to provide dynamical and mechanistic information of fundamental interest for combustion and atmospheric reaction processes. 86 refs.« less

Authors:
Publication Date:
Research Org.:
Columbia Univ., New York, NY (USA). Dept. of Chemistry
Sponsoring Org.:
USDOE; USDOE, Washington, DC (USA)
OSTI Identifier:
5881748
Report Number(s):
DOE/ER/13937-3
ON: DE91013021
DOE Contract Number:  
FG02-88ER13937
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; POLYATOMIC MOLECULES; EXCITED STATES; ATOM-MOLECULE COLLISIONS; CARBON DIOXIDE; CARBON OXYSULFIDE; HOT ATOM CHEMISTRY; LASERS; NITRIC OXIDE; PROGRESS REPORT; ROTATIONAL STATES; VIBRATIONAL STATES; ATOM COLLISIONS; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; CHEMISTRY; COLLISIONS; DOCUMENT TYPES; ENERGY LEVELS; MOLECULE COLLISIONS; MOLECULES; NITROGEN COMPOUNDS; NITROGEN OXIDES; OXIDES; OXYGEN COMPOUNDS; RADIOCHEMISTRY; SULFUR COMPOUNDS; 400500* - Photochemistry; 400701 - Radiochemistry & Nuclear Chemistry- Hot-Atom Chemistry

Citation Formats

Flynn, G. Laser enhanced chemical reaction studies. United States: N. p., 1990. Web.
Flynn, G. Laser enhanced chemical reaction studies. United States.
Flynn, G. Sat . "Laser enhanced chemical reaction studies". United States.
@article{osti_5881748,
title = {Laser enhanced chemical reaction studies},
author = {Flynn, G.},
abstractNote = {Experimental studies of dynamic molecular processes are described with particular emphasis on the use of a powerful infrared diode laser probe technique developed in our laboratory. This technique allows us to determine the final states of CO{sub 2} (and other molecules) produced by collisions, photofragmentation, or chemical reactions with a spectral resolution of 0.0003 cm{sup {minus}1} and a time resolution of 10{sup {minus}7} sec. Such high spectral resolution provides a detailed picture of the vibrational and rotational states of molecules produced by these dynamic events. We have used this experimental method to probe collisions between hot hydrogen/deuterium atoms and CO{sub 2}, between O({sup 1}D) atoms and CO{sub 2}, to study the final states of DCl molecules produced as a result of the reactions of hot Cl atoms, and to investigate the dynamics of the reaction between OH and CO molecules. Advances in our technique over the past two years have allowed us to identify and study more than 200 final rotational states in ten different vibrational levels of CO{sub 2} encompassing all 3 normal modes, many overtones, and combination states of the molecule. We have extended the technique to probe a variety of new molecules such as OCS, N{sub 2}O, DCl, CS{sub 2} and Cl atoms (via the {sup 2}P{sub 3/2} {yields} {sup 2}P{sub 1/2} atomic transition). All of this work is aimed at providing experimental tests for polyatomic molecule potential energy surfaces, chemical transition states in complex systems, and theories of reaction dynamics in molecules with more than 3 atoms. We hope through these experiments to provide dynamical and mechanistic information of fundamental interest for combustion and atmospheric reaction processes. 86 refs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1990},
month = {12}
}

Technical Report:
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