The IFB-Xsystem

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Abstract
The technique of laser induced detection of chemical reaction products has been used to study the reaction: I2 + F → IF + I. Using a single frequency dye laser and an accurate wavenumber measurement, the X 1Σ+ → B 3Π(0+) excitation spectrum of the product IF molecules has been studied with high resolution over a large spectral range (700–789 nm and 837–873 nm). Due to the exoenergicity of the reaction very high rovibrational levels are populated in the X state up to ν″ = 20. Our measurements, together with those of previous authors, have allowed us to obtain an improved and extended spectroscopic representation of the X and B states of IF in terms of Dunham coefficients.