Data set generated in collaboration with Dr Andy Lamb from Aerodyne Inc. Portions of this dataset are inaccessible because: Non-EPA-owned by Aerodyne Inc. They can be accessed through the following means: Contact Dr Andy Lamb from Aerodyne Inc. at: lambe@aerodyne.com/. Format: Data format, size, if special instruments /software is needed to read the data. This dataset is associated with the following publication: Lambe, A., C. Glenn, A. Avery, T. Xu, J.C. Ditto, M. Canagaratna, D. Gentner, K. Docherty, M. Jaoui, J. Zaks, A.K. Bertram, N.L. Ng, and P. Liu. Gas-Phase Nitrate Radical Production Using Irradiated Ceric Ammonium Nitrate: Insights into Secondary Organic Aerosol Formation from Biogenic and Biomass Burning Precursors. ACS Earth and Space Chemistry. American Chemical Society, Washington, DC, USA, 9(3): 545-559, (2025).