Chemiluminescent reactions of Al atoms and halogens

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Abstract
Al atoms diluted in a buffer gas were reacted with F2, Cl2, Br2, I2, NF3, and SF6 producing chemiluminescent flames. Emission from the a 3Π to the ground X 1Σ+ state of AlX(X=F, Cl, Br, I) and from higher electronic states of AlF and AlCl has been observed. Bands of NF and N2 were emitted from Al+NF3 reaction. Al lines were observed from all reaction mixtures except Al+I2, and it is suggested that Al atoms are excited by energy transfer from metastable molecules formed in the reactions. Photon yields were 2% for Al+NF3 and less than 0.01% for Al+F2, Cl2, Br2, I2, and SF6.

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