2024-Deep-UV absorption cross sections of NO, SO2, biogenic and anthropogenic VOCs

Description

See Wang, Connolly, Venables, "Deep-ultraviolet absorption cross sections of strongly absorbing atmospheric species" (2024). Accurate absorption cross sections at appropriate resolution are essential for such applications, but are not well characterised for even major atmospheric species like nitric oxide (NO) and key biogenic and anthropogenic volatile organic compounds (BVOCs and AVOCs). This dataset includes new absorption cross section spectra from 197 to 235 nm for NO and important aromatic AVOCs (benzene, toluene, ethylbenzene, and o-, m-, and p-xylene) and BVOCs (α-pinene, β-pinene, limonene, 3-carene, and myrcene) at 1 atm and 293 K. Measurements were made with a xenon flashlamp spectrometer using a flow cell configuration for gas mixtures and a static cell arrangement for liquid vapor-phase VOC samples. The resolution of the spectrum at 253.7 nm was determined to be 0.1 nm. Both configurations showed excellent agreement in magnitude and spectral features with well-established literature cross sections. Flow cell measurements were validated against the absorption cross section of sulfur dioxide (SO2) and static cell measurements against that of isoprene. Our absorption cross sections of NO and m-xylene reconcile large differences in the magnitude and spectral structure of previous cross sections. The deep-UV absorption cross sections of 3-carene, myrcene and ethylbenzene are reported for the first time, and confirmed for α-pinene, β-pinene, and limonene.

Steps to reproduce

See a more detailed description in Wang, Connolly, Venables, "Deep-ultraviolet absorption cross sections of strongly absorbing atmospheric species" (2024).

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