Nitrogen dioxide is brown due to its electronic absorption spectrum
Nitrogen dioxide absorbs blue and ultraviolet light while transmitting green and red wavelengths, which results in its characteristic brown-yellow color due to its electronic absorption spectrum.
The claim specifically attributes the brown color of nitrogen dioxide to its electronic absorption spectrum. Multiple foundational and recent studies (e.g., papers 1, 4, and 8) investigate and confirm the electronic transitions and visible light absorption properties of nitrogen dioxide that account for its optical appearance. There are no refuting papers.
J. K. Dixon. The Absorption Coefficient of Nitrogen Dioxide in the Visible Spectrum. 1940. https://doi.org/10.1063/1.1750622
Measures the visible spectrum absorption coefficients of nitrogen dioxide, establishing its optical properties in the region responsible for its color.
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S. Ndengué, E. Quintas-Sánchez, R. Dawes, D. Osborn. The Low-Lying Electronic States of NO2: Potential Energy and Dipole Surfaces, Bound States, and Electronic Absorption Spectrum.. 2021. https://doi.org/10.1021/acs.jpca.1c03482
Computes the electronic absorption spectrum and electronic structure of nitrogen dioxide, confirming how its transitions dictate its visible light interaction.
S. Ndengué, E. Quintas-Sánchez, R. Dawes, Christopher C. Blackstone, D. Osborn. Temperature Dependence of the Electronic Absorption Spectrum of NO2.. 2023. https://doi.org/10.1021/acs.jpca.3c02832
Investigates the electronic absorption spectrum of nitrogen dioxide across various temperatures, further analyzing the molecular energy states governing its absorption.
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