Laser-excited fluorescence of the CN radical was obtained using various discrete prism selected lines of krypton and argon-ion lasers. The source of hot CN is a slightly rich atmospheric pressure CH₄/N₂O premixed flame diluted with N₂. The flame is placed within the extended cavity of the ion lasers to take advantage of much higher light intensities. Both B²∑⁺ ← X²∑⁺ and B²∑⁺ ← A²II transitions of CN have been pumped. The Kr⁺ laser lines, 6764, 6471, 5309, 4680, 4154, 4131, and 3564 Å, all pump CN. The 4545-Å line of the Ar⁺ laser also pumps CN. Vibrational and rotational assignments have been made. Detection of CN in a burning propellant sample has been accomplished by this technique.

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