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The effect of delay time on the CO and CH3 radicals resulting from the photolysis of acetone by 193 nm excimer laser
Faculty
Science
Year:
2004
Type of Publication:
Article
Pages:
187-191
Authors:
Badr, Y, Mahmoud, MA, Adb elwanees, S
DOI:
10.1016/j.jphotochem.2004.03.014
Journal:
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY ELSEVIER SCIENCE SA
Volume:
165
Research Area:
Chemistry
ISSN
ISI:000222693900025
Keywords :
radicals, photolysis, acetone
Abstract:
A time-resolved Fourier transform IR spectrometer is used to measure the emitted spectra of the fragments resulting from the photodissociation of 3S Rydberg state acetone by a 193 nm excimer laser at different delay times between the FTIR and the laser. Two vibrational bands are detected. The first band, a single peak in the range of 3200-2750 cm(-1), is assigned to be the CH of the methyl radicals, is unresolved. The second is a resolved double peak band in the range of 2250-1950 cm(-1) is assigned to be the P and R branches of the CO molecule. The emitted spectra of the CO molecule and the methyl radicals are measured at different delay times from 1 to 50 mus. The integrated intensity of the emitted spectra of CO was found to increase with delay times up to 50 mus, while that of the methyl radicals showed the opposite behaviour. Plotting the relationship between the laser power and the integrated intensity of the CO spectrum yielded a straight line with a gradient similar to1. this may indicate that the process is a single-photon reaction. (C) 2004 Elsevier B.V. All rights reserved.
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