Abstract
The infrared absorption spectrum of nitrogen peroxide has been investigated in the gaseous and liquid states, by using a prism spectrometer. Absorption bands were observed at 3.3μ, 3.89μ, 5.7μ, 6.14μ, 7.28μ, 7.85μ, 13.3μ and 15.6μ in the gaseous state, and at 3.65μ and 5.7μ in the liquid state. By heating the gas to a temperature of 150°C, it was found that the bands at 3.89μ, 5.7μ, 7.85μ and 13.3μ were due to N2O4, while those at 3.3μ, 6.14μ, 7.28μ and 15.6μ were due to NO2.