Journal ArticleDOI
High-resolution absorption cross-section of glyoxal in the UV–vis and IR spectral ranges
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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
Aircraft measurements of BrO, IO, glyoxal, NO 2 , H 2 O, O 2 –O 2 and aerosol extinction profiles in the tropics: comparison with aircraft-/ship-based in situ and lidar measurements
Rainer Volkamer,Rainer Volkamer,Sunil Baidar,Sunil Baidar,Teresa Campos,Sean Coburn,Sean Coburn,Joshua P. DiGangi,Joshua P. DiGangi,Barbara Dix,Edwin W. Eloranta,Theodore K. Koenig,Theodore K. Koenig,Bruce Morley,Ivan Ortega,Ivan Ortega,Bridget R. Pierce,Mike Reeves,R. Sinreich,Siyuan Wang,Siyuan Wang,Siyuan Wang,Mark A. Zondlo,P. Romashkin +23 more
TL;DR: In this paper, the results of two research flights (RF12, RF17) over the tropical Eastern Pacific Ocean (tEPO) as part of the "Tropical Ocean tRoposphere Exchange of Reactive halogens and Oxygenated hydrocarbons" (TORERO) project are presented.
Journal ArticleDOI
A broadband cavity enhanced absorption spectrometer for aircraft measurements of glyoxal, methylglyoxal, nitrous acid, nitrogen dioxide, and water vapor
Kyung-Eun Min,Kyung-Eun Min,Kyung-Eun Min,Rebecca A. Washenfelder,Rebecca A. Washenfelder,William P. Dubé,William P. Dubé,Andrew O. Langford,Peter Edwards,Peter Edwards,Peter Edwards,Kyle J. Zarzana,Kyle J. Zarzana,Jochen Stutz,Keding Lu,Franz Rohrer,Y. Zhang,Steven S. Brown +17 more
TL;DR: In this paper, a two-channel broadband cavity enhanced absorption spectrometer (BBCEAS) was proposed for aircraft measurements of glyoxal (CHOCHO), methylglyoxal(CH3COCHO), nitrous acid (HONO), nitrogen dioxide (NO2), and water (H2O).
Journal ArticleDOI
ZnO supported CoFe2O4 nanophotocatalysts for the mineralization of Direct Blue 71 in aqueous environments.
Panneerselvam Sathishkumar,N. Pugazhenthiran,Ramalinga Viswanathan Mangalaraja,Abdullah M. Asiri,Sambandam Anandan +4 more
TL;DR: CoFe2O4/ZnO nanocatalyst coupled with acceptor, peroxomonosulphate (PMS) showed 1.69-fold enhancement in Direct Blue 71 (triazo dye; DB71) mineralization within 5h and enrichment in decolorization was due to the production of more number of non-selective and active free radicals at the catalyst surface.
Journal ArticleDOI
The optical, physical and chemical properties of the products of glyoxal uptake on ammonium sulfate seed aerosols
TL;DR: In this paper, the authors studied the relationship between gas phase glyoxal and ammonium sulfate (AS) aerosols in terms of the dependence of the optical, physical and chemical properties of the product aerosols on initial particle size and ambient relative humidity (RH).
Journal ArticleDOI
Dicarbonyl products of the OH radical-initiated reaction of a series of aromatic hydrocarbons.
Janet Arey,Genevieve Obermeyer,Sara M. Aschmann,Sulekha Chattopadhyay,Roland D. Cusick,Roger Atkinson +5 more
TL;DR: A derivatization technique with methane positive chemical ionization gas chromatography/mass spectrometry was used to investigate the carbonyl products formed from the OH radical-initiated reactions of toluene, the xylenes, and the trimethylbenzenes, and characteristic diderivatized molecular ions of dicarbonyl Products were obtained.
References
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The Role of Solar Radiation in Atmospheric Chemistry
Sasha Madronich,S. J. Flocke +1 more
TL;DR: In this article, the photo-dissociation rate coefficients (J values) are used to understand the behavior of global stratospheric and tropospheric ozone, the atmospheric lifetimes of gases such as carbon monoxide, methane, and non-methane hydrocarbons, and the formation of oxidants at urban and regional scales.
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Journal ArticleDOI
Primary and Secondary Glyoxal Formation from Aromatics: Experimental Evidence for the Bicycloalkyl−Radical Pathway from Benzene, Toluene, and p-Xylene
Rainer Volkamer,Ulrich Platt,Klaus Wirtz,Centro de Estudios,Ambientales del Mediterraneo,C. Charles,R. Darwin +6 more
TL;DR: In this paper, a new approach is presented to study the ring-cleavage process of benzene, toluene, and p-xylene (BTX) in a series of experiments at the EUPHORE outdoor simulation chamber.
Journal ArticleDOI
On-road emissions of carbonyls from light-duty and heavy-duty vehicles
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