Gas-phase absorption cross sections of 24 monocyclic aromatic hydrocarbons in the UV and IR spectral ranges

Etzkorn, T.; Klotz, Björn; Sørensen, S. C.; Patroescu, Iulia V.; Barnes, Ian; Becker, K. H.; Platt, U.

doi:10.1016/s1352-2310(98)00289-1

Cited by 137 publications

(120 citation statements)

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“…An obvious absorption peak around 290 nm was observed for styrene while the absorption peaks for 2-methylstyrene and ␤-methylstyrene shift towards longer wavelengths. The bathochromic shift by an ortho-substitution of a methyl group is comparable to that of benzene/toluene [14] or benzaldehyde/o-tolualdehyde [15]. However, the opposite effect (hypsochromic shift) occurs for ␣-methylstyrene and indene compared to styrene.…”

Section: Uv Absorption Cross-sectionsmentioning

confidence: 89%

“…Using the data obtained here and assuming that the cross-sections above 320 nm up to 360 nm to be in the order of the cross-section at 320 nm, ∼10 −21 cm 2 molecule −1 , we estimated the upper limits for the J values of the studied species (in 10 −6 s −1 ): 7, 7, 9, 10 and 1 for styrene, ␣-methylstyrene, ␤-methylstyrene, 2-methylstyrene and indene, respectively. The contribution to the photolysis for wavelength higher than 360 nm is considered as negligible as for other aromatic compounds [14].…”

Section: Uv Absorption Cross-sectionsmentioning

confidence: 99%

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The near UV absorption cross-sections and the rate coefficients for the ozonolysis of a series of styrene-like compounds

Person

Eyglunent

Daële

et al. 2008

Journal of Photochemistry and Photobiology A: Chemistry

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Section: Uv Absorption Cross-sectionsmentioning

confidence: 89%

Section: Uv Absorption Cross-sectionsmentioning

confidence: 99%

The near UV absorption cross-sections and the rate coefficients for the ozonolysis of a series of styrene-like compounds

Person

Eyglunent

Daële

et al. 2008

Journal of Photochemistry and Photobiology A: Chemistry

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“…23 The absorption cross sections used for the evaluation of the DOAS and FT-IR spectra were determined in a separate study. 20 In addition to these instruments, two J(NO 2 ) filter radiometers (one measuring direct sunlight, one facing downward to measure reflected light from the floor panels) and sampling ports for an ozone monitor (Monitor Labs), a Monitor Labs ML9841A NO x monitor with a catalytic converter and an Eco Physics CLD 770 AL NO x monitor with a photolytic converter PLC 760 are installed. The temperature in the chamber was measured with two thermocouples PT-100, one measuring the floor temperature and one measuring the temperature of the chamber air.…”

Section: Methodsmentioning

confidence: 99%

Atmospheric Oxidation of Toluene in a Large-Volume Outdoor Photoreactor: In Situ Determination of Ring-Retaining Product Yields

Klotz¹,

Sørensen²,

Barnes³

et al. 1998

J. Phys. Chem. A

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Experiments on the photooxidation of toluene/NO x /air mixtures were performed in the European Photoreactor (EUPHORE), a large-scale outdoor reaction chamber located in Valencia/Spain. The objective of the study was the in situ determination of the yields of ring-retaining products by differential optical absorption spectroscopy (DOAS) and the elucidation of their formation pathways. The experiments were performed with toluene concentrations between 0.68 and 3.85 ppm and initial NO x concentrations ranging from 3 to 300 ppb, i.e., down to the range actually observed in the lower atmosphere. The ring-retaining product yields were found to be 5.8 ( 0.8%, 12.0 ( 1.4%, 2.7 ( 0.7%, and 3.2 ( 0.6% for benzaldehyde, o-cresol, m-cresol, and p-cresol, respectively. Under the experimental conditions, no dependency of the yields on the NO x concentration or the toluene/NO x ratio could be found. The formation kinetics of the cresols are in line with a "prompt" formation mechanism, i.e., abstraction of a hydrogen atom from the toluene-OH adduct (toluene-OH + O 2 f cresols + HO 2 ). In addition, substantial evidence was found that reaction with NO 3 radicals represents an important sink for cresols in smog chamber studies conducted under conditions of NO x concentrations above the range observed in the troposphere, possibly also under tropospheric conditions.

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“…As concentrations of VOCs in the background atmosphere were considerably smaller than VOC concentrations inside the basin, changes in VOC ratios due to mixing in of background air are negligible. Integrated UV absorption cross sections of C6-C10 aromatic hydrocarbons are small and similar to one another (Etzkorn et al, 1999), so D photolysis,B − D photolysis,A is likely negligible compared to primary emission and reaction with OH. The same argument can be made for wet or dry deposition, D deposition,B −D deposition,A ∼ = 0, as monocyclic aromatic compounds are structurally similar and have small solubilities in water.…”

Section: Primary Compoundsmentioning

confidence: 99%

Photochemical aging of volatile organic compounds associated with oil and natural gas extraction in the Uintah Basin, UT, during a wintertime ozone formation event

et al. 2015

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Abstract. High concentrations of volatile organic compounds (VOCs) associated with oil and natural gas extraction were measured during a strong temperature inversion in the winter of 2013 at a rural site in the Uintah Basin, Utah. During this period, photochemistry enhanced by the stagnant meteorological conditions and concentrated VOCs led to high ozone mixing ratios (150 ppbv). A simple analysis of aromatic VOCs measured by proton-transfer-reaction mass-spectrometry (PTR-MS) is used to estimate (1) VOC emission ratios (the ratio of two VOCs at the time of emission) relative to benzene, (2) aromatic VOC emission rates, and (3) ambient OH radical concentrations. These quantities are determined from a best fit to VOC : benzene ratios as a function of time. The main findings are that (1) emission ratios are consistent with contributions from both oil and gas producing wells; (2) the emission rate of methane (27-57 × 10 3 kg methane h −1 ), extrapolated from the emission rate of benzene (4.1 ± 0.4 × 10 5 molecules cm −3 s −1 ), agrees with an independent estimate of methane emissions from aircraft measurements in 2012; and (3) calculated daily OH concentrations are low, peaking at 1 × 10 6 molecules cm −3 , and are consistent with Master Chemical Mechanism (MCM) modeling. The analysis is extended to photochemical production of oxygenated VOCs measured by PTR-MS and is able to explain daytime variability of these species. It is not able to completely reproduce nighttime behavior, possibly due to surface deposition. Using results from this analysis, the carbon mass of secondary compounds expected to have formed by the sixth day of the stagnation event was calculated, then compared to the measured mass of primary and secondary compounds. Only 17 % of the expected secondary carbon mass is accounted for by gas phase, aerosol, and snow organic carbon measurements. The disparity is likely due to substantial amounts of unquantified oxygenated products.

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Gas-phase absorption cross sections of 24 monocyclic aromatic hydrocarbons in the UV and IR spectral ranges

Cited by 137 publications

References 0 publications

The near UV absorption cross-sections and the rate coefficients for the ozonolysis of a series of styrene-like compounds

The near UV absorption cross-sections and the rate coefficients for the ozonolysis of a series of styrene-like compounds

Atmospheric Oxidation of Toluene in a Large-Volume Outdoor Photoreactor: In Situ Determination of Ring-Retaining Product Yields

Photochemical aging of volatile organic compounds associated with oil and natural gas extraction in the Uintah Basin, UT, during a wintertime ozone formation event

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