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 ground state of CO
2
. The structure of this energy level pattern is strongly affected by extensive Fermi resonance in the
1
Σ
+
g
state. The spectrum is emitted by excited CO
2
molecules which radiate to the ground state from the lowest vibrational level and from the
v
´
2
= 1 level of a
B
2
state. This excited state lies approximately 46 000 cm
-1
above the lowest level of the ground state, an d 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
1
B
2
state, and that the carbon monoxide flame bands are associated with the weak absorption system of CO
2
at 1475 Å.
Reference27 articles.
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5. Canad. J;Clement M. J .;Phys.,1961
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