Abstract
The quenching of the B 2Σ+ fluorescence from the CN radical has been studied as a function of the relative velocity of the quenching collision, vR, and the total gas pressure in the fluorescence cell. The rate constant for the quenching of the CN fragment by ICN vapor was found to be directly proportional to vR. Electronic quenching was also observed for CH4, H2, Kr, and Ar. Quenching cross sections of 1 and 46 Å2 were obtained for CH4 and ICN, respectively.

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