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Rohrer, Franz; Brüning, D.; Grobler, Ellen S.; Weber, Mark; Ehhalt, D. H.; Neubert, R. E. M.; Schüßler, W.; Levin, Ingeborg

doi:10.1023/a:1006166116242

Cited by 41 publications

(3 citation statements)

References 25 publications

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“…The spike features of the NO 2 mixing ratios during the daytime may be attributed to nearby traffic. The changes in NO 2 concentration may be due to changes in the boundary layer height . The NO 2 level started to decrease from sunrise.…”

Section: Ambient Measurementmentioning

confidence: 99%

High-Sensitivity Instrument for Measuring Atmospheric NO₂

et al. 2001

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We report on the development of a high-sensitivity detection system for measuring atmospheric NO2 using a laser-induced fluorescence (LIF) technique around 440 nm. A tunable broad-band optical parametric oscillator laser pumped by the third harmonic of a Nd:YAG laser is used as a fluorescence excitation source. The laser wavelength is tuned at peak and bottom wavelengths around 440 nm alternatively, and the difference signal at the two wavelengths is used to extract the NO2 concentration. This procedure can give a good selectivity for NO2 and avoid interferences of fluorescent or particulate species other than NO2 in the sample air. The NO2 instrument developed has a sensitivity of 30 pptv in 10 s and S/N = 2. The practical performance of the detection system is tested in the suburban area for 24 h. The intercomparisons between the LIF instrument and a photofragmentation chemiluminescence (PF-CL) instrument have been performed under laboratory conditions. The correlation between the two instruments is measured up to 1000 pptv. A good linear relationship between the LIF measurements and the PF-CL measurements is obtained.

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Section: Ambient Measurementmentioning

confidence: 99%

High-Sensitivity Instrument for Measuring Atmospheric NO₂

et al. 2001

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“…Once the alkanes are released into the ambient air, they are eliminated through reactions with OH radicals and Cl atoms; moreover, they slowly react with NO 3 radicals and almost do not react with ozone . NO x concentrations and various precursor structures impact the dominating mechanisms and product distributions in the photodegradation of long-chain alkanes by OH radicals. − High-NO x conditions are characteristic of urban areas or polluted regions, while low-NO x conditions represent remote areas or clean regions. − Lim and Zieman investigated the effect of the parent alkane molecular structure on the SOA yield and volatility in the presence of NO x ; for a given carbon number, the SOA yields followed the order cyclic > linear > branched, a trend that was primarily determined by the extent to which alkoxy radical intermediates decomposed and the property of the formed products, with the volatility of the parent alkane being of secondary importance. Yee et al and Loza et al measured the SOA yields of the reactions of hexylcyclohexane, cyclododecane, n -dodecane, and 2-methylundecane with OH radicals under low- and high-NO x conditions; the presence of cyclization in the parent alkane structure increased the SOA yields under both low- and high-NO x conditions.…”

Section: Introductionmentioning

confidence: 99%

Reactions of C₁₂–C₁₄ n-Alkylcyclohexanes with Cl Atoms: Kinetics and Secondary Organic Aerosol Formation

Wang

Fan

et al. 2022

Environ. Sci. Technol.

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Long-chain alkanes are a type of intermediate volatility organic compound (IVOC) in the atmosphere and a potential source of secondary organic aerosols (SOAs). C 12 −C 14 nalkylcyclohexanes are important compositions of IVOCs, with considerable concentrations and emission rates. The reaction rate constants and SOA formation of the reactions of C 12 −C 14 nalkylcyclohexanes with Cl atoms were investigated in the present study. The reaction rate constants of the long-chain alkanes obtained via the relative-rate method at 298 ± 0.2 K (in units of ×10 −10 cm 3 molecule −1 s −1 ) were as follows: k hexylcyclohexane = 5.11 ± 0.28, k heptylcyclohexane = 5.56 ± 0.30, and k octylcyclohexane = 5.74 ± 0.31. The gas-phase products of the reactions were identified as mainly small molecules of aldehydes, ketones, and acids. The particlephase products were mostly monomers and oligomers, but there were still trimers even under high-NO x conditions. Moreover, under high-NO x conditions (urban atmosphere), the SOA yields of hexylcyclohexane are higher than that under low-NO x conditions (remote atmosphere), indicating that more attention should be given to the SOA formation of Cl-initiated n-alkylcyclohexane oxidations in polluted regions. This research can further clarify the oxidation processes and SOA formation of n-alkylcyclohexanes in the atmosphere.

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“…Those values are consistent with the ones reported in previous studies at the same latitudes and seasons. 56,85,92,117,118 Finally, most of the flights took place under anticyclonic conditions favorable to photochemistry reactions. The positive gradient in temperature, humidity, and J (NO 2 ) is consistent with the latitudinal gradient between the three regions.…”

Section: Resultsmentioning

confidence: 99%

O₃–NO_y photochemistry in boundary layer polluted plumes: insights from the MEGAPOLI (Paris), ChArMEx/SAFMED (North West Mediterranean) and DACCIWA (southern West Africa) aircraft campaigns

Thera

Dominutti

Colomb

et al. 2022

Environ. Sci.: Atmos.

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Untitled

Cited by 41 publications

References 25 publications

High-Sensitivity Instrument for Measuring Atmospheric NO₂

High-Sensitivity Instrument for Measuring Atmospheric NO₂

Reactions of C₁₂–C₁₄ n-Alkylcyclohexanes with Cl Atoms: Kinetics and Secondary Organic Aerosol Formation

O₃–NO_y photochemistry in boundary layer polluted plumes: insights from the MEGAPOLI (Paris), ChArMEx/SAFMED (North West Mediterranean) and DACCIWA (southern West Africa) aircraft campaigns

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Untitled

Cited by 41 publications

References 25 publications

High-Sensitivity Instrument for Measuring Atmospheric NO2

High-Sensitivity Instrument for Measuring Atmospheric NO2

Reactions of C12–C14 n-Alkylcyclohexanes with Cl Atoms: Kinetics and Secondary Organic Aerosol Formation

O3–NOy photochemistry in boundary layer polluted plumes: insights from the MEGAPOLI (Paris), ChArMEx/SAFMED (North West Mediterranean) and DACCIWA (southern West Africa) aircraft campaigns

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Product

Resources

About

High-Sensitivity Instrument for Measuring Atmospheric NO₂

High-Sensitivity Instrument for Measuring Atmospheric NO₂

Reactions of C₁₂–C₁₄ n-Alkylcyclohexanes with Cl Atoms: Kinetics and Secondary Organic Aerosol Formation

O₃–NO_y photochemistry in boundary layer polluted plumes: insights from the MEGAPOLI (Paris), ChArMEx/SAFMED (North West Mediterranean) and DACCIWA (southern West Africa) aircraft campaigns