Abstract

A theoretical band-absorption model is constructed for molecules with vibration–rotation spectra. This model consists of an infinite line array of the regular or random type, modulated by a band envelope whose intensity falls off exponentially from the band center. The “weak”- and “strong”-fit empirical curves of Howard, Burch, and Williams are shown to be limiting cases of the modulated band transmittance. Further, through application of the model, the band intensity and shape are explicitly related to the experimental constants.

© 1965 Optical Society of America

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