The Absorption Coefficient of Nitrogen Pentoxide in the Ultraviolet and the Visible Absorption Spectrum of NO3

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Abstract
Absorption spectrograms have been made of the gaseous system N2O5–O3 during the decomposition of the ozone and into the subsequent decomposition of the N2O5, placing these in time such that one was taken when the system consisted essentially of only N2O5 and oxygen. From such spectrograms as the last mentioned, the absorption coefficient, α10, of N2O5 has been measured over the wave‐length range 3800–2850A. The value rises steadily from approximately 0.002 at the first wave‐length to approximately 0.52 at 2850A. The absorption coefficient curve continues to rise to shorter wave‐lengths and qualitative observations indicated no maximum as far as 2400A. No absorption which could be attributed to N2O5 could be observed in the 4500A region. Absorption spectrograms of NO3 in the visible are given. In a study using low dispersion of the influence of oxygen on the absorption spectrum of NO2, no noticeable effect was observed.

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