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  Home > JCE Print > Journal of Chemical Education > Issues > 2000  > October  >
In the Laboratory
Spectroscopy of Flames: Luminescence Spectra of Reactive Intermediates
Ágúst Kvaran, Árni Hr. Haraldsson, and Thorsteinn I. Sigfusson
Science Institute, University of Iceland, Dunhaga 3, 107 Reykjavík, Iceland
Cover
October 2000
Vol. 77 No. 10
p. 1345
Abstract
Luminescence spectra of oxygen-rich propane gas flames have been recorded in medium-high resolution. Well-separated vibrational bands for electronic transitions in C2, CH, and OH are observed. The spectra are found to be rich in terms of both vibrational and rotational structure. A large number of bandheads with varying intensities are observed in C2(d(3Pg)--a(3Pu)). Bands are found to be degraded toward the blue: C2(d(3Pg)--a(3Pu)); red: CH(B(2S-)--X(2P)) and OH(A(2S+)--X(2P)); or to be nearly symmetric in shape: CH(A(2D)--X(2P)). Clear rotational structure with identifiable rotational line series (P, Q and R) are observed for CH(A--X and B--X). The relative intensities of vibrational bands vary considerably from one system to another. These observations can be used to demonstrate a number of basic principles in quantum chemistry and spectroscopy relevant to electronic, vibrational, and rotational structure of molecules as well as transition probabilities. Conventional spectra analysis of the C2(d--a) vibrational structure and the CH(B--X) rotational structure are presented. Furthermore, spectra simulations of the C2(d--a) vibrational structure and the CH(A--X) rotational structure are described.
Supplement
Laboratory porcedures and data analysis are explained in detail in the supplemental material.
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*  Citation
 Kvaran, Ágúst; Haraldsson, Árni Hr.; Sigfusson, Thorsteinn I. J. Chem. Educ. 2000 77 1345.
*  Keywords
 Excited States / Energy Transfer; Luminescence; Physical Chemistry; Quantum Chemistry; Reactive Intermediates; UV-Vis Spectroscopy; Carbon; Hydrogen; Oxygen
*  History
 Created:
Last Updated:		 September 22, 2000
August 31, 2005
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