Search Results - "Hoffmann, Erik H."

Direct sulfuric acid formation from the gas-phase oxidation of reduced-sulfur compounds by Berndt, Torsten, Hoffmann, Erik H., Tilgner, Andreas, Stratmann, Frank, Herrmann, Hartmut

“…Sulfuric acid represents a fundamental precursor for new nanometre-sized atmospheric aerosol particles. These particles, after subsequent growth, may influence…”
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Particle-Phase Photoreactions of HULIS and TMIs Establish a Strong Source of H2O2 and Particulate Sulfate in the Winter North China Plain by Ye, Can, Chen, Hui, Hoffmann, Erik H, Mettke, Peter, Tilgner, Andreas, He, Lin, Mutzel, Anke, Brüggemann, Martin, Poulain, Laurent, Schaefer, Thomas, Heinold, Bernd, Ma, Zhuobiao, Liu, Pengfei, Xue, Chaoyang, Zhao, Xiaoxi, Zhang, Chenglong, Zhang, Fei, Sun, Hao, Li, Qing, Wang, Lin, Yang, Xin, Wang, Jinhe, Liu, Cheng, Xing, Chengzhi, Mu, Yujing, Chen, Jianmin, Herrmann, Hartmut

“…During haze periods in the North China Plain, extremely high NO concentrations have been observed, commonly exceeding 1 ppbv, preventing the classical…”
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An improved multiphase chemistry mechanism for methylamines: significant dimethylamine cloud production by Hoffmann, Erik H., Tilgner, Andreas, Herrmann, Hartmut

“…Monomethylamine (MMA), dimethylamine (DMA), and trimethylamine (TMA) are important compounds for atmospheric key processes, e.g., new particle formation (NPF)…”
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Gas‐Phase Formation of Sulfurous Acid (H2SO3) in the Atmosphere by Berndt, Torsten, Hoffmann, Erik H., Tilgner, Andreas, Herrmann, Hartmut

“…Sulfurous acid (H2SO3) is known to be thermodynamically instable decomposing into SO2 and H2O. All attempts to detect this elusive acid in solution failed up…”
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Kinetics and Mechanisms of Aqueous-Phase Reactions of Triplet-State Imidazole-2-carboxaldehyde and 3,4-Dimethoxybenzaldehyde with α,β-Unsaturated Carbonyl Compounds by Aregahegn, Kifle Z., Felber, Tamara, Tilgner, Andreas, Hoffmann, Erik H., Schaefer, Thomas, Herrmann, Hartmut

“…Reactions in the atmospheric aqueous phase are an important source of secondary organic aerosols (SOA). Within the present study, the reactions of…”
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Enhanced Chlorine and Bromine Atom Activation by Hydrolysis of Halogen Nitrates from Marine Aerosols at Polluted Coastal Areas by Hoffmann, Erik H, Tilgner, Andreas, Wolke, Ralf, Herrmann, Hartmut

“…Detailed multiphase chemistry box model studies are carried out, investigating halogen radical activation at polluted coastal areas. Simulations are performed…”
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Daytime Atmospheric Halogen Cycling through Aqueous-Phase Oxygen Atom Chemistry by Dalton, Evan Z., Hoffmann, Erik H., Schaefer, Thomas, Tilgner, Andreas, Herrmann, Hartmut, Raff, Jonathan D.

“…Halogen atoms are important atmospheric oxidants that have unidentified daytime sources from photochemical halide oxidation in sea salt aerosols. Here, we show…”
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Temperature-Dependent Oxidation of Hydroxylated Aldehydes by •OH, SO4 •–, and NO3 • Radicals in the Atmospheric Aqueous Phase by Mekic, Majda, Schaefer, Thomas, Hoffmann, Erik H., Aiyuk, Marvel B.E., Tilgner, Andreas, Herrmann, Hartmut

“…T-dependent aqueous-phase rate constants were determined for the oxidation of the hydroxy aldehydes, glyceraldehyde, glycolaldehyde, and lactaldehyde, by the…”
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Temperature-Dependent Oxidation of Hydroxylated Aldehydes by • OH, SO 4 •- , and NO 3 • Radicals in the Atmospheric Aqueous Phase by Mekic, Majda, Schaefer, Thomas, Hoffmann, Erik H, Aiyuk, Marvel B E, Tilgner, Andreas, Herrmann, Hartmut

“…-dependent aqueous-phase rate constants were determined for the oxidation of the hydroxy aldehydes, glyceraldehyde, glycolaldehyde, and lactaldehyde, by the…”
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Hydrotrioxide (ROOOH) formation in the atmosphere by Berndt, Torsten, Chen, Jing, Kjærgaard, Eva R, Møller, Kristian H, Tilgner, Andreas, Hoffmann, Erik H, Herrmann, Hartmut, Crounse, John D, Wennberg, Paul O, Kjaergaard, Henrik G

“…Organic hydrotrioxides (ROOOH) are known to be strong oxidants used in organic synthesis. Previously, it has been speculated that they are formed in the…”
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Opinion: The germicidal effect of ambient air (open-air factor) revisited by Cox, R. Anthony, Ammann, Markus, Crowley, John N, Griffiths, Paul T, Herrmann, Hartmut, Hoffmann, Erik H, Jenkin, Michael E, McNeill, V. Faye, Mellouki, Abdelwahid, Penkett, Christopher J, Tilgner, Andreas, Wallington, Timothy J

“…The term open-air factor (OAF) was coined following microbiological research in the 1960s and 1970s which established that rural air had powerful germicidal…”
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Near-Explicit Multiphase Modeling of Halogen Chemistry in a Mixed Urban and Maritime Coastal Area by Hoffmann, Erik H, Tilgner, Andreas, Vogelsberg, Ulrike, Wolke, Ralf, Herrmann, Hartmut

“…In the present study, detailed air-parcel model simulations have been carried out that focus on multiphase halogen chemistry and its impact on the air quality…”
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CAPRAM reduction towards an operational multiphase halogen and dimethyl sulfide chemistry treatment in the chemistry transport model COSMO-MUSCAT(5.04e) by Hoffmann, Erik H, Schrödner, Roland, Tilgner, Andreas, Wolke, Ralf, Herrmann, Hartmut

“…A condensed multiphase halogen and dimethyl sulfide (DMS) chemistry mechanism for application in chemistry transport models is developed by reducing the CAPRAM…”
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Rapid growth of Aitken-mode particles during Arctic summer by fog chemical processing and its implication by Kecorius, Simonas, Hoffmann, Erik H, Tilgner, Andreas, Barrientos-Velasco, Carola, van Pinxteren, Manuela, Zeppenfeld, Sebastian, Vogl, Teresa, Madueño, Leizel, Lovrić, Mario, Wiedensohler, Alfred, Kulmala, Markku, Paasonen, Pauli, Herrmann, Hartmut

“…In the Arctic, new particle formation (NPF) and subsequent growth processes are the keys to produce Aitken-mode particles, which under certain conditions can…”
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Urban Grime Photochemistry and Its Interaction with Air Pollutants NO, NO2, and O3: A Source for HONO and NO2 Impacting OH in Urban Areas by Mothes, Falk, Hoffmann, Erik H., Herrmann, Hartmut

“…The interaction of air pollutants with urban grime surface films (e.g., windows, building walls, etc.) are potentially impacting urban air quality due to…”
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Urban Grime Photochemistry and Its Interaction with Air Pollutants NO, NO 2 , and O 3 : A Source for HONO and NO 2 Impacting OH in Urban Areas by Mothes, Falk, Hoffmann, Erik H., Herrmann, Hartmut

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Gasphasenbildung von Schwefliger Säure (H2SO3) in der Atmosphäre by Berndt, Torsten, Hoffmann, Erik H., Tilgner, Andreas, Herrmann, Hartmut

“…Schweflige Säure (H2SO3) ist dafür bekannt, dass sie thermodynamisch instabil ist und in SO2 und H2O zerfällt. Alle Versuche, diese schwer zugängliche Säure in…”
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A CAPRAM Modeling Study on the Role of Heterogeneous Reactions on Dust in Tropospheric Chemistry by Aiyuk, Marvel B. E., Hoffmann, Erik H., Tilgner, Andreas, Wolke, Ralf, Herrmann, Hartmut

“…A heterogeneous dust chemistry module was developed and coupled toward the near-explicit mechanism MCM. Model simulations were performed for different dust…”
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Particle-Phase Photoreactions of HULIS and TMIs Establish a Strong Source of H 2 O 2 and Particulate Sulfate in the Winter North China Plain by Ye, Can, Chen, Hui, Hoffmann, Erik H., Mettke, Peter, Tilgner, Andreas, He, Lin, Mutzel, Anke, Brüggemann, Martin, Poulain, Laurent, Schaefer, Thomas, Heinold, Bernd, Ma, Zhuobiao, Liu, Pengfei, Xue, Chaoyang, Zhao, Xiaoxi, Zhang, Chenglong, Zhang, Fei, Sun, Hao, Li, Qing, Wang, Lin, Yang, Xin, Wang, Jinhe, Liu, Cheng, Xing, Chengzhi, Mu, Yujing, Chen, Jianmin, Herrmann, Hartmut

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Insights Into NO x and HONO Chemistry in the Tropical Marine Boundary Layer at Cape Verde During the MarParCloud Campaign by Jiang, Ying, Hoffmann, Erik H., Tilgner, Andreas, Aiyuk, Marvel B. E., Andersen, Simone T., Wen, Liang, van Pinxteren, Manuela, Shen, Hengqing, Xue, Likun, Wang, Wenxing, Herrmann, Hartmut

“…Abstract Chemical processing of reactive nitrogen species, especially of NO x (= NO + NO 2 ) and nitrous acid (HONO), determines the photochemical ozone…”
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