ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
The collision-induced intramolecular energy transfer from CN(X 2Σ+,v‘) to CN(A 2Π) was observed in a thermal energy molecular beam through the CN(A→X) emission. In some preliminary experiments, CN(B→X) emission, resulting from collision-induced energy transfer from CN(X 2Σ+) to CN(B 2Σ+), was also observed. CN(X,v‘) radicals were generated in a dc discharge burning in the expansion region of an Ar/CH3CN supersonic beam. Downstream from the source they interacted with a target gas in a collision cell. The relative formation rates of CN(A) with He, Ne, Ar, and Kr as collision gases were obtained. The relative vibrational population distribution of CN(A,v'=2–12) was also determined. It was found to be very similar for the four collision gases. In the wavelength region of the well-known perturbations between the A and X states, the rotational contours of the A→X emission bands show no pronounced enhancement. This demonstrates that in the spin-allowed collision-induced transition CN(A←X) the so-called gateway mechanism is much less important than in some spin-forbidden transitions [N2(B←A') and NO(B←a)] studied previously by us. © 1994 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.467981
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