Absorption Spectrum at 357 mμ in the Nitrogen Oxides—Water System

Abstract
A previously unreported ultraviolet absorption spectrum has been observed in aged solutions of low acidity containing HNO2. It is similar to that of HNO2 without the vibrational substructure, and its presence was detected by a differential recording technique. Possible sources of the unidentified spectrum are considered in detail. A cyclic configuration of the ion HONONO+, which could be formed in the presence of NO+ and HNO2, can satisfactorily account for the properties of the unidentified absorber, but this hypothesis has not yet been tested experimentally.

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