Journal ArticleDOI
High-resolution absorption cross-section of glyoxal in the UV–vis and IR spectral ranges
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TLDR
In this article, high-resolution absorption cross-sections of glyoxal have been recorded at 296 k in the ultraviolet and visible (UV-vis: 19000-40000 cm−1, 250-526 k) spectral ranges by means of a Fourier transform spectrometer (FTS).Abstract:
High-resolution absorption cross-sections of glyoxal have been recorded at 296 K in the ultraviolet and visible (UV–vis: 19000–40000 cm−1, 250–526 nm) and infrared (IR: 1200–8000 cm−1) spectral ranges by means of a Fourier transform spectrometer (FTS). The UV–vis spectra were measured at 1 atm of N2 bath gas. The spectral resolution of the FTS was selected to be 0.06 cm−1 for the richly structured A ˜ 1Au – X ˜ 1Ag and a ˜ 3Au – X ˜ 1Ag band systems, and 1 cm−1 for the diffuse B ˜ − X ˜ transition, which was sufficient to resolve most spectral structures. In addition, low and high-resolution IR spectra (1 and 0.009 cm−1 spectral resolution) of glyoxal/N2 mixtures were recorded around 2835 cm−1 at 0.2 mbar, 100 mbar, 300 mbar and 1 atm total pressure. UV–vis and IR spectra were recorded quasi-simultaneously by making sequential measurements of identical glyoxal mixtures in the cell, enabling the direct comparison of UV–vis and IR spectral parameters for the first time. The high-resolution spectra have been used to simulate deviations from Lambert–Beer's law, which occur at lower resolution when spectra are not fully resolved. Special attention has been paid to reduce the uncertainty of the UV–vis spectrum, allowing for an improved determination of the atmospheric photolysis of glyoxal. Finally, the new UV–vis spectrum has been used to redetermine our previous DOAS measurements of glyoxal yields from the reactions of OH radicals with benzene, toluene and p-xylene. The high-resolution spectral data can be obtained from http://iup.physik.uni-bremen.de/gruppen/molspec/index.html or email request to the authors.read more
Citations
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Journal ArticleDOI
Real-time monitoring of benzene, toluene, and p-xylene in a photoreaction chamber with a tunable mid-infrared laser and ultraviolet differential optical absorption spectroscopy
Matthew T. Parsons,Ihor Sydoryk,Alan Lim,Thomas J. McIntyre,John Tulip,Wolfgang Jäger,Karen McDonald +6 more
TL;DR: The EC-QCL based system provides quantitation limits of approximately 200, 200, and 600 parts in 10(9) (ppb) for benzene, toluene, and p-xylene, respectively, which represents a significant improvement over the previous work with this laser system.
Journal ArticleDOI
Study on the daytime OH radical and implication for its relationship with fine particles over megacity of Shanghai, China
TL;DR: In this article, a long-path differential optical absorption spectroscopy (LP-DOAS) system was employed to observe the main OH precursors of O3, HCHO and HONO, as well as NO2 and NO3 radical from April to August 2013 over Shanghai, China.
Journal ArticleDOI
Primary emissions of glyoxal and methylglyoxal from laboratory measurements of open biomass burning
Kyle J. Zarzana,Kyle J. Zarzana,Kyle J. Zarzana,Vanessa Selimovic,Abigail R. Koss,Kanako Sekimoto,Kanako Sekimoto,Kanako Sekimoto,Matthew M. Coggon,Matthew M. Coggon,Bin Yuan,Bin Yuan,Bin Yuan,William P. Dubé,William P. Dubé,Robert J. Yokelson,Carsten Warneke,Carsten Warneke,Joost A. de Gouw,Joost A. de Gouw,Joost A. de Gouw,James M. Roberts,Steven S. Brown,Steven S. Brown +23 more
TL;DR: This article reported the emissions of glyoxal and methylglyoxal from open burning of biomass during the NOAA-led 2016 FIREX intensive at the Fire SciencesLaboratory in Missoula, MT.
Journal ArticleDOI
Intercomparison of multiaxis and long-path differential optical absorption spectroscopy measurements in the marine boundary layer
TL;DR: In this article, the authors performed multiaxis differential optical absorption spectroscopy (MAX-DOAS) measurements of NO2 and HCHO performed in the Gulf of Maine during the ICARTT campaign in summer 2004.
Book ChapterDOI
Remote Sensing of Glyoxal by Differential Optical Absorption Spectroscopy (DOAS): Advancements in Simulation Chamber and Field Experiments
TL;DR: In this article, the photochemical transformation of primary pollutants like VOCs and NOx is linked with the formation of secondary pollutants including ozone (O3) and secondary organic aerosol (SOA).
References
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Primary and Secondary Glyoxal Formation from Aromatics: Experimental Evidence for the Bicycloalkyl−Radical Pathway from Benzene, Toluene, and p-Xylene
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