Infrared Spectroscopic Investigation of Ultraviolet‐Irradiated Sodium Azide Crystals

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Abstract
This study is concerned with new absorption bands which appear in the infrared spectrum when sodium azide crystals are irradiated with ultraviolet light at 77°K. The observed frequencies and frequency shifts of the irradiation bands produced by NaN3, NaN15NN, NaNN15N, and Na15N3 indicate that they are caused by some configuration of vibrating nitrogen atoms. Calculated frequency‐shift values for various polyatomic nitrogen defects, which have a high probability of being produced by ultraviolet photolysis, were obtained using expressions derived on the assumption of valence forces. By comparing calculated and observed values, considerations are given to the capability of several polyatomic nitrogen structures to produce the new infrared absorptions.

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