Abstract
Nitric oxide, iodine, cyanogen, and lithium bromide have been added to CO/N 2 /O 2 flames containing less than .007% of hydrogen-containing impurities. Relative oxygen atom concentrations, derived from measured intensities of emission bands of CO 2 , NO 2 , and IO, are compared. Addition of NO produced a significant reduction in the O-atom concentration, the effect being greatest in O 2 -rich flames. Measurements of the resonance absorption by lithium atoms indicate that LiO is the major compound formed by lithium in O 2 -rich flames, but they do not rule out the possibility that significant amounts of LiO 2 are also formed. A recalculation of earlier data yields D o Na-O 2 = 234 ± 13 kJ mol −1 ; we estimate D o Li-O 2 = 222 ± 25 kJ mol − .
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