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TitleInfrared Absorption Spectroscopy and Chemical Kinetics of Free Radicals. Final Performance Report, August 1, 1985--July 31, 1994
Author(s)Curl, R. F.; Glass, G. P.
Publication DateJune 1995
Report NumberDOE/ER/13439--T5
Unique IdentifierACC0478
Other NumbersLegacy ID: DE95013504; OSTI ID: 82413
Research OrgRice University, Houston, TX (United States). Dept. of Chemistry
Contract NoFG05-85ER13439
Sponsoring OrgUS Department of Energy (DOE), Washington, DC (United States)
Subject40 Chemistry; Radicals:T1; Infrared Spectra:Q1; Chemical Reactions:Q1; Progress Report; Combustion; Gases; Oxygen; Methane; Nitric Oxide; Absorption Spectroscopy; Photolysis; Ethyl Radicals; Chemical Reaction Kinetics; Hydroxyl Radicals
Related Web PagesRobert Curl, Jr. and the Discovery of Fullerenes
AbstractThis research was directed at the detection, monitoring, and study (by infrared absorption spectroscopy) of the chemical kinetic behavior of small free radical species thought to be important intermediates in combustion. The work typically progressed from the detection and analysis of the infrared spectrum of combustion radical to the utilization of the infrared spectrum thus obtained in the investigation of chemical kinetics of the radical species. The methodology employed was infrared kinetic spectroscopy. In this technique the radical is produced by UV flash photolysis using an excimer laser and then its transient infrared absorption is observed using a single frequency cw laser as the source of the infrared probe light. When the probe laser frequency is near the center of an absorption line of the radical produced by the flash, the transient infrared absorption rises rapidly and then decays as the radical reacts with the precursor or with substances introduced for the purpose of studying the reaction kinetics or with itself. The decay times observed in these studies varied from less than one microsecond to more than one millisecond. By choosing appropriate time windows after the flash and the average infrared detector signal in a window as data channels, the infrared spectrum of the radical may be obtained. By locking the infrared probe laser to the center of the absorption line and measuring the rate of decay of the transient infrared absorption signal as the chemical composition of the gas mixture is varied, the chemical kinetics of the radical may be investigated. In what follows the systems investigated and the results obtained are outlined.
3940 K
8 pp.
 
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