Abstract

Strong emission has been observed in the reaction of KrF₂ with SiH₄. The emission spectra have been identified to be the B²∑ → X²∑ transition of KrF. The dependence of the spectral shape of the emission has been examined as a function of argon pressure. The pressure dependence of the spectral shape appears to be due to vibrational relaxation in the B²∑ state. The emission intensity as a function of SiH₄ and KrF₂ concentration has been measured. Since the KrF(X²∑) ground-state binding energy is less than 100 cm⁻¹, which is substantially smaller than the room-temperature thermal energy, the ground-state bottlenecking of KrF is negligible. Therefore, for any branching ratio of B to X formation, there should be a population inversion on the KrF B²∑ → X²∑ transition.

© 1991 Optical Society of America

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