Abstract
The light yield for the Swan bands is measured for a number of hydrocarbons. For C
2
H
2
+ 2½O
2
flames 3 x 10
-5
photons are emitted for each O
2
consumed at 1 atm. pressure, rising to 13.5 x 10
-5
at 3.5 mm. pressure. For propane the effect of pressure is more marked. The effect of mixture strength and of diluents is studied. For partial replacement of hydrocarbon by H
2
or CO (the mixture being held stoichiometric) the yield falls with surprising rapidity, being proportional to a high power of the hydrocarbon concentration (square to sixth power). Preliminary results for CH are similar. The C
2
emission does not appear to be due to true chemiluminescence, but there is abnormally high excitation by some active species in the flame, and the concentration of C
2
exceeds the values found by Brewer, Gilles & Jenkins for equilibrium with solid carbon at the flame temperature. Polymerization and formation of unsaturated compounds appears to be important. The relation between C
2
emission and the formation of solid carbon is discussed; polymerization of C
2
cannot account quantitatively for the formation of solid particles.
Reference9 articles.
1. B re w e r L . G illes P . W . & J e n k in s F . A .
2. Proc. Roy;Soc. A,1948
3. G a y d o n A . G . & W o If h a rd H . G .
4. G a y d o n A . G . & W o If h a rd H . G .
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