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The Carbon Monoxide Flame Bands

R. N. Dixon
Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences
Vol. 275, No. 1362 (Oct. 8, 1963), pp. 431-446
Published by: Royal Society
Stable URL: http://www.jstor.org/stable/2414583
Page Count: 18
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The Carbon Monoxide Flame Bands
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Abstract

The carbon monoxide flame bands have been photographed under high resolution from an afterglow source. Bands in the wavelength range 3100 to 3800 Å show a pattern which has been reproduced by calculations of the energies of high vibrational levels of the 1∑+ g ground state of CO2. The structure of this energy level pattern is strongly affected by extensive Fermi resonance in the 1∑+ g state. The spectrum is emitted by excited CO2 molecules which radiate to the ground state from the lowest vibrational level and from the v'z = 1 level of a B2 state. This excited state lies approximately 46 000 cm-1 above the lowest level of the ground state, and has an OCO angle of 122 ± 2⚬ and a CO bond length of 1·246 ± 0·008 Å. Combination of these results with the work of other authors shows that the excited state is a 1B2 state, and that the carbon monoxide flame bands are associated with the weak absorption system of CO2 at 1475 Å.

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