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A chemiluminescence spectrum above 1 μ is observed when olefins or formaldehyde are reacted with active oxygen. Part of the bands are quenched by water vapor and shifted upon deuteration of the fuel, while others are unaffected. The latter bands are attributed to the ( 2 A′- 2 A″) electronic transition of HO 2  radicals produced by the reaction of HCO radicals with O 2 ( 1 ⊿ g ) metastable molecules. The quenchable bands are probably overtone transitions of vibrationally excited HO 2  radicals in the  2 A″ ground state.

The Chemiluminescent Reaction of HCO with O 2 ( 1 ⊿ g )