Abstract
Spontaneous emission rates and absorption oscillator strengths for prominent ΔV≤4 sequence bands of theB2Σ+-A2Πi transition of the CN molecule are estimated. The wavelengths of some lines observed in the coma spectrum of the comet Bradfield 1980t as well as in several comets coincide with these ΔV≤4 sequence LeBlanc bands of the CN radical. Formation and destruction of the CN radical in the coma of a comet are discussed in the framework of gas phase reactions.
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