Abstract
Numerous emission lines from excited I, Br, and Cl atoms have been observed between 1261 and 2062 Å. For the flames with I2, IBr, and ICl it is possible to assign excitation mechanisms on the basis of the dependence of emission intensity on either [N] or [N]2. In the case of dependence on [N] the emission is the result of energy transfer from an excited nitrogen molecule, which is produced by reaction of N with NI, has an energy of 185 ± 3.5 kcal/mole, and is identified with the predicted 3Δu species. The dissociation energy of NI is found to lie between 35.6 and 40 + 3.5 kcal/mole. It is proposed that excited nitrogen molecules can be produced as well as removed very rapidly by processes of the type[Formula: see text]
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