Chemiluminescence and photoluminescence of diatomic iron oxide

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Abstract
Band emission from the Infrared, Orange, and Blue systems of FeO is observed in chemiluminescent flames resulting from the reaction of Fe with O3, N2O, NO2, and discharged O2. Flames are produced at a relatively low temperature (700 K) in flowing inert gas at pressures of 10−3 atm. Bands not previously reported are observed and ascribed to FeO. Reaction of Fe with O2 produces continuumlike emission of unidentified origin; however, laser photoluminescence studies confirm ground state FeO is present. Photon yields for the Orange systems of FeO formed in reactions with O3 and N2O are found to be on the order of 2% and 0.2%, respectively. Photoluminescence of FeO is excited with a krypton ion laser and a cw, tunable dye laser. Ground state vibrational constants of ω″e = 875.8 cm−1 and ω″ex″e = 4.6 cm−1 are determined from the laser excited photoluminescence spectra. Using the tunable dye laser, a rotational constant for the upper state of the B 0,0 band (λ = 579 nm) is found to be B′0 = 0.497 cm−1. Radiative lifetimes of the Orange system upper electronic levels are measured using a pulsed, tunable dye laser excitation source. Lifetimes are found to be on the order of 450±100 nsec.

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