Abstract
The addition of small amounts of carbon monoxide to active nitrogen induces strong emission of the CO fourth positive bands, (A
1
Π—X
1
∑
+
), which extends up to
v
' = 8. The kinetic behaviour of the emission is closely similar to that of the Lyman-Birge-Hopfield emission of N
2
, comprising terms proportional to [N]
2
/([M] + γ) and [N]
3
/[M], the latter being enhanced in argon carriers. It is shown that CO(A
1
Π) is excited by efficient energy transfer from N
2
(a
1
Π
g
) and is removed predominantly by radiation. Excited triplet states of N
2
excite triplet states of CO but they do not contribute significantly to singlet CO emission.
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