969 results on '"Flagan, Richard C."'
Search Results
2. The gas-phase formation mechanism of iodic acid as an atmospheric aerosol source
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Finkenzeller, Henning, Iyer, Siddharth, He, Xu-Cheng, Simon, Mario, Koenig, Theodore K., Lee, Christopher F., Valiev, Rashid, Hofbauer, Victoria, Amorim, Antonio, Baalbaki, Rima, Baccarini, Andrea, Beck, Lisa, Bell, David M., Caudillo, Lucía, Chen, Dexian, Chiu, Randall, Chu, Biwu, Dada, Lubna, Duplissy, Jonathan, Heinritzi, Martin, Kemppainen, Deniz, Kim, Changhyuk, Krechmer, Jordan, Kürten, Andreas, Kvashnin, Alexandr, Lamkaddam, Houssni, Lee, Chuan Ping, Lehtipalo, Katrianne, Li, Zijun, Makhmutov, Vladimir, Manninen, Hanna E., Marie, Guillaume, Marten, Ruby, Mauldin, Roy L., Mentler, Bernhard, Müller, Tatjana, Petäjä, Tuukka, Philippov, Maxim, Ranjithkumar, Ananth, Rörup, Birte, Shen, Jiali, Stolzenburg, Dominik, Tauber, Christian, Tham, Yee Jun, Tomé, António, Vazquez-Pufleau, Miguel, Wagner, Andrea C., Wang, Dongyu S., Wang, Mingyi, Wang, Yonghong, Weber, Stefan K., Nie, Wei, Wu, Yusheng, Xiao, Mao, Ye, Qing, Zauner-Wieczorek, Marcel, Hansel, Armin, Baltensperger, Urs, Brioude, Jérome, Curtius, Joachim, Donahue, Neil M., Haddad, Imad El, Flagan, Richard C., Kulmala, Markku, Kirkby, Jasper, Sipilä, Mikko, Worsnop, Douglas R., Kurten, Theo, Rissanen, Matti, and Volkamer, Rainer
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- 2023
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3. Synergistic HNO3–H2SO4–NH3 upper tropospheric particle formation
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Wang, Mingyi, Xiao, Mao, Bertozzi, Barbara, Marie, Guillaume, Rörup, Birte, Schulze, Benjamin, Bardakov, Roman, He, Xu-Cheng, Shen, Jiali, Scholz, Wiebke, Marten, Ruby, Dada, Lubna, Baalbaki, Rima, Lopez, Brandon, Lamkaddam, Houssni, Manninen, Hanna E., Amorim, António, Ataei, Farnoush, Bogert, Pia, Brasseur, Zoé, Caudillo, Lucía, De Menezes, Louis-Philippe, Duplissy, Jonathan, Ekman, Annica M. L., Finkenzeller, Henning, Carracedo, Loïc Gonzalez, Granzin, Manuel, Guida, Roberto, Heinritzi, Martin, Hofbauer, Victoria, Höhler, Kristina, Korhonen, Kimmo, Krechmer, Jordan E., Kürten, Andreas, Lehtipalo, Katrianne, Mahfouz, Naser G. A., Makhmutov, Vladimir, Massabò, Dario, Mathot, Serge, Mauldin, Roy L., Mentler, Bernhard, Müller, Tatjana, Onnela, Antti, Petäjä, Tuukka, Philippov, Maxim, Piedehierro, Ana A., Pozzer, Andrea, Ranjithkumar, Ananth, Schervish, Meredith, Schobesberger, Siegfried, Simon, Mario, Stozhkov, Yuri, Tomé, António, Umo, Nsikanabasi Silas, Vogel, Franziska, Wagner, Robert, Wang, Dongyu S., Weber, Stefan K., Welti, André, Wu, Yusheng, Zauner-Wieczorek, Marcel, Sipilä, Mikko, Winkler, Paul M., Hansel, Armin, Baltensperger, Urs, Kulmala, Markku, Flagan, Richard C., Curtius, Joachim, Riipinen, Ilona, Gordon, Hamish, Lelieveld, Jos, El-Haddad, Imad, Volkamer, Rainer, Worsnop, Douglas R., Christoudias, Theodoros, Kirkby, Jasper, Möhler, Ottmar, and Donahue, Neil M.
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- 2022
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4. Aerosol-Cloud-Meteorology Interaction Airborne Field Investigations: Using Lessons Learned from the US West Coast in the Design of ACTIVATE off the US East Coast Aerosol-Cloud-Meteorology Interaction Airborne Field Investigations: Using Lessons Learned from the US West Coast in the Design of ACTIVATE off the US East Coast
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Sorooshian, Armin, Anderson, Bruce, Bauer, Susanne E, Braun, Rachel A, Cairns, Brian, Crosbie, Ewan, Dadashazar, Hossein, Diskin, Glenn, Ferrare, Richard, Flagan, Richard C, Hair, Johnathan, Hostetler, Chris, Jonsson, Haflidi H, Kleb, Mary M, Liu, Hongyu, MacDonald, Alexander B, McComiskey, Allison, Moore, Richard, Painemal, David, Russell, Lynn M, Seinfeld, John H, Shook, Michael, Smith, William L, Thornhill, Kenneth, Tselioudis, George, Wang, Hailong, Zeng, Xubin, Zhang, Bo, Ziemba, Luke, and Zuidema, Paquita
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Astronomical and Space Sciences ,Atmospheric Sciences ,Physical Geography and Environmental Geoscience ,Meteorology & Atmospheric Sciences - Abstract
Abstract: We report on a multiyear set of airborne field campaigns (2005–16) off the California coast to examine aerosols, clouds, and meteorology, and how lessons learned tie into the upcoming NASA Earth Venture Suborbital (EVS-3) campaign: Aerosol Cloud meTeorology Interactions oVer the western ATlantic Experiment (ACTIVATE; 2019–23). The largest uncertainty in estimating global anthropogenic radiative forcing is associated with the interactions of aerosol particles with clouds, which stems from the variability of cloud systems and the multiple feedbacks that affect and hamper efforts to ascribe changes in cloud properties to aerosol perturbations. While past campaigns have been limited in flight hours and the ability to fly in and around clouds, efforts sponsored by the Office of Naval Research have resulted in 113 single aircraft flights (>500 flight hours) in a fixed region with warm marine boundary layer clouds. All flights used nearly the same payload of instruments on a Twin Otter to fly below, in, and above clouds, producing an unprecedented dataset. We provide here i) an overview of statistics of aerosol, cloud, and meteorological conditions encountered in those campaigns and ii) quantification of model-relevant metrics associated with aerosol–cloud interactions leveraging the high data volume and statistics. Based on lessons learned from those flights, we describe the pragmatic innovation in sampling strategy (dual-aircraft approach with combined in situ and remote sensing) that will be used in ACTIVATE to generate a dataset that can advance scientific understanding and improve physical parameterizations for Earth system and weather forecasting models, and for assessing next-generation remote sensing retrieval algorithms.
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- 2019
5. Is double masking even worthwhile?
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Chea, Peter H., Pushpawela, Buddhi, Ward, Ryan X., and Flagan, Richard C.
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COVID-19 pandemic ,PRESSURE drop (Fluid dynamics) ,MEDICAL masks ,RESPIRATORY protective devices - Abstract
Double masking generally decreases the penetration of particles and increases the pressure drop compared to the individual mask. During the COVID-19 pandemic, the Centers for Disease Control and Prevention (CDC) and health experts recommended double masking to improve protection against COVID-19. However, the performance of double masks related to their particle penetration, pressure drops (breathing resistance or comfort), type of mask, and combinations was limited in the literature. To address these limitations, this study measured and compared the particle penetration and pressure drop of single and double masks that were fully sealed at a steady flow rate of 30 LPM. Of the double masks tested, N95 + procedure masks, N95 + cloth masks, KN95 + procedure masks, KN95 + cloth masks, and procedure + cloth masks all exhibited 3-5% penetration, comparable with that of the N95s. The pressure drop measured for different double mask combinations varied between 38 and 83 Pa. These pressure drop values agreed well with the theoretical pressure drops estimated by the sum of the respective pressure drop values of single masks. The combination of procedure and cloth masks provided similar pressure drops and penetration performance to a single respirator, making this low-cost double mask combination adequate in situations where respirators are less cost-effective or in limited supply. Therefore, the results of this study offer information to the community about the proper mask combinations that provide more (similar) protection than the individual mask (respirators). Copyright © 2024 American Association for Aerosol Research [ABSTRACT FROM AUTHOR]
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- 2024
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6. Rapid growth of organic aerosol nanoparticles over a wide tropospheric temperature range
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Stolzenburg, Dominik, Fischer, Lukas, Vogel, Alexander L, Heinritzi, Martin, Schervish, Meredith, Simon, Mario, Wagner, Andrea C, Dada, Lubna, Ahonen, Lauri R, Amorim, Antonio, Baccarini, Andrea, Bauer, Paulus S, Baumgartner, Bernhard, Bergen, Anton, Bianchi, Federico, Breitenlechner, Martin, Brilke, Sophia, Mazon, Stephany Buenrostro, Chen, Dexian, Dias, António, Draper, Danielle C, Duplissy, Jonathan, Haddad, Imad El, Finkenzeller, Henning, Frege, Carla, Fuchs, Claudia, Garmash, Olga, Gordon, Hamish, He, Xucheng, Helm, Johanna, Hofbauer, Victoria, Hoyle, Christopher R, Kim, Changhyuk, Kirkby, Jasper, Kontkanen, Jenni, Kürten, Andreas, Lampilahti, Janne, Lawler, Michael, Lehtipalo, Katrianne, Leiminger, Markus, Mai, Huajun, Mathot, Serge, Mentler, Bernhard, Molteni, Ugo, Nie, Wei, Nieminen, Tuomo, Nowak, John B, Ojdanic, Andrea, Onnela, Antti, Passananti, Monica, Petäjä, Tuukka, Quéléver, Lauriane LJ, Rissanen, Matti P, Sarnela, Nina, Schallhart, Simon, Tauber, Christian, Tomé, António, Wagner, Robert, Wang, Mingyi, Weitz, Lena, Wimmer, Daniela, Xiao, Mao, Yan, Chao, Ye, Penglin, Zha, Qiaozhi, Baltensperger, Urs, Curtius, Joachim, Dommen, Josef, Flagan, Richard C, Kulmala, Markku, Smith, James N, Worsnop, Douglas R, Hansel, Armin, Donahue, Neil M, and Winkler, Paul M
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aerosols ,nanoparticle growth ,aerosol formation ,CLOUD experiment ,volatile organic compounds - Abstract
Nucleation and growth of aerosol particles from atmospheric vapors constitutes a major source of global cloud condensation nuclei (CCN). The fraction of newly formed particles that reaches CCN sizes is highly sensitive to particle growth rates, especially for particle sizes
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- 2018
7. Assessing the importance of nitric acid and ammonia for particle growth in the polluted boundary layer
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Marten, Ruby, primary, Xiao, Mao, additional, Wang, Mingyi, additional, Kong, Weimeng, additional, He, Xu-Cheng, additional, Stolzenburg, Dominik, additional, Pfeifer, Joschka, additional, Marie, Guillaume, additional, Wang, Dongyu S., additional, Elser, Miriam, additional, Baccarini, Andrea, additional, Lee, Chuan Ping, additional, Amorim, Antonio, additional, Baalbaki, Rima, additional, Bell, David M., additional, Bertozzi, Barbara, additional, Caudillo, Lucía, additional, Dada, Lubna, additional, Duplissy, Jonathan, additional, Finkenzeller, Henning, additional, Heinritzi, Martin, additional, Lampimäki, Markus, additional, Lehtipalo, Katrianne, additional, Manninen, Hanna E., additional, Mentler, Bernhard, additional, Onnela, Antti, additional, Petäjä, Tuukka, additional, Philippov, Maxim, additional, Rörup, Birte, additional, Scholz, Wiebke, additional, Shen, Jiali, additional, Tham, Yee Jun, additional, Tomé, António, additional, Wagner, Andrea C., additional, Weber, Stefan K., additional, Zauner-Wieczorek, Marcel, additional, Curtius, Joachim, additional, Kulmala, Markku, additional, Volkamer, Rainer, additional, Worsnop, Douglas R., additional, Dommen, Josef, additional, Flagan, Richard C., additional, Kirkby, Jasper, additional, McPherson Donahue, Neil, additional, Lamkaddam, Houssni, additional, Baltensperger, Urs, additional, and El Haddad, Imad, additional
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- 2024
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8. Breath-, air- and surface-borne SARS-CoV-2 in hospitals
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Zhou, Lian, Yao, Maosheng, Zhang, Xiang, Hu, Bicheng, Li, Xinyue, Chen, Haoxuan, Zhang, Lu, Liu, Yun, Du, Meng, Sun, Bochao, Jiang, Yunyu, Zhou, Kai, Hong, Jie, Yu, Na, Ding, Zhen, Xu, Yan, Hu, Min, Morawska, Lidia, Grinshpun, Sergey A., Biswas, Pratim, Flagan, Richard C., Zhu, Baoli, Liu, Wenqing, and Zhang, Yuanhang
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- 2021
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9. Discontinuities in hygroscopic growth below and above water saturation for laboratory surrogates of oligomers in organic atmospheric aerosols
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Hodas, Natasha, Zuend, Andreas, Schilling, Katherine, Berkemeier, Thomas, Shiraiwa, Manabu, Flagan, Richard C, and Seinfeld, John H
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Meteorology & Atmospheric Sciences ,Atmospheric Sciences ,Astronomical and Space Sciences - Abstract
Abstract. Discontinuities in apparent hygroscopicity below and above water saturation have been observed for organic and mixed organic–inorganic aerosol particles in both laboratory studies and in the ambient atmosphere. However, uncertainty remains regarding the factors that contribute to observations of low hygroscopic growth below water saturation but enhanced cloud condensation nuclei (CCN) activity for a given aerosol population. Utilizing laboratory surrogates for oligomers in atmospheric aerosols, we explore the extent to which such discontinuities are influenced by organic component molecular mass and viscosity, non-ideal thermodynamic interactions between aerosol components, and the combination of these factors. Measurements of hygroscopic growth under subsaturated conditions and the CCN activity of aerosols comprised of polyethylene glycol (PEG) with average molecular masses ranging from 200 to 10 000 g mol−1 and mixtures of PEG with ammonium sulfate (AS) were conducted. Experimental results are compared to calculations of hygroscopic growth at thermodynamic equilibrium conducted with the Aerosol Inorganic Organic Mixtures Functional groups Activity Coefficients (AIOMFAC) model, and the potential influence of kinetic limitations on observed water uptake was further explored through estimations of water diffusivity in the PEG oligomers. Particle-phase behavior, including the prevalence of liquid–liquid phase separation (LLPS), was also modeled with AIOMFAC. Under subsaturated relative humidity (RH) conditions, we observed little variability in hygroscopic growth across PEG systems with different molecular masses; however, an increase in CCN activity with increasing PEG molecular mass was observed. This effect is most pronounced for PEG–AS mixtures, and, in fact, an enhancement in CCN activity was observed for the PEG10000–AS mixture as compared to pure AS, as evidenced by a 15 % reduction in critical activation diameter at a supersaturation of 0.8 %. We also observed a marked increase in apparent hygroscopicity for mixtures of higher molecular mass PEG and AS under supersaturated conditions as compared to subsaturated hygroscopic growth. AIOMFAC-based predictions and estimations of water diffusivity in PEG suggest that such discontinuities in apparent hygroscopicity above and below water saturation can be attributed, at least in part, to differences in the sensitivity of water uptake behavior to surface tension effects. There is no evidence that kinetic limitations to water uptake due to the presence of viscous aerosol components influenced hygroscopic growth. For the systems that display an enhancement in apparent hygroscopicity above water saturation, LLPS is predicted to persist to high RH. This indicates a miscibility gap and is likely to influence bulk-to-surface partitioning of PEG at high RH, impacting droplet surface tension and CCN activity. This work provides insight into the factors likely to be contributing to discontinuities in aerosol water-uptake behavior below and above water saturation that have been observed previously in the ambient atmosphere.
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- 2016
10. Neutral molecular cluster formation of sulfuric acid dimethylamine observed in real time under atmospheric conditions
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Kürten, Andreas, Jokinen, Tuija, Simon, Mario, Sipilä, Mikko, Sarnela, Nina, Junninen, Heikki, Adamov, Alexey, Almeida, João, Amorim, Antonio, Bianchi, Federico, Breitenlechner, Martin, Dommen, Josef, Donahue, Neil M., Duplissy, Jonathan, Ehrharta, Sebastian, Flagan, Richard C., Franchin, Alessandro, Hakala, Jani, Hansel, Armin, Heinritzia, Martin, Hutterli, Manuel, Kangasluoma, Juha, Kirkby, Jasper, Laaksonen, Ari, Lehtipalo, Katrianne, Leiminger, Markus, Makhmutov, Vladimir, Mathot, Serge, Onnela, Antti, Petäjä, Tuukka, Praplan, Arnaud P., Riccobono, Francesco, Rissanen, Matti P., Rondo, Linda, Schobesberger, Siegfried, Seinfeld, John H., Steiner, Gerhard, Tomé, António, Tröstl, Jasmin, Winkler, Paul M., Williamson, Christina, Wimmer, Daniela, Ye, Penglin, Baltensperger, Urs, Carslaw, Kenneth S., Kulmala, Markku, Worsnop, Douglas R., and Curtius, Joachim
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Physics - Atmospheric and Oceanic Physics ,Physics - Chemical Physics - Abstract
For atmospheric sulfuric acid (SA) concentrations the presence of dimethylamine (DMA) at mixing ratios of several parts per trillion by volume can explain observed boundary layer new particle formation rates. However, the concentration and molecular composition of the neutral (uncharged) clusters have not been reported so far due to the lack of suitable instrumentation. Here we report on experiments from the Cosmics Leaving Outdoor Droplets chamber at the European Organization for Nuclear Research revealing the formation of neutral particles containing up to 14 SA and 16 DMA molecules, corresponding to a mobility diameter of about 2 nm, under atmospherically relevant conditions. These measurements bridge the gap between the molecular and particle perspectives of nucleation, revealing the fundamental processes involved in particle formation and growth. The neutral clusters are found to form at or close to the kinetic limit where particle formation is limited only by the collision rate of SA molecules. Even though the neutral particles are stable against evaporation from the SA dimer onward, the formation rates of particles at 1.7-nm size, which contain about 10 SA molecules, are up to 4 orders of magnitude smaller comparedwith those of the dimer due to coagulation and wall loss of particles before they reach 1.7 nm in diameter. This demonstrates that neither the atmospheric particle formation rate nor its dependence on SA can simply be interpreted in terms of cluster evaporation or the molecular composition of a critical nucleus., Comment: Main text plus SI
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- 2015
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11. Overview of measurements and current instrumentation for 1–10 nm aerosol particle number size distributions
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Kangasluoma, Juha, Cai, Runlong, Jiang, Jingkun, Deng, Chenjuan, Stolzenburg, Dominik, Ahonen, Lauri R., Chan, Tommy, Fu, Yueyun, Kim, Changhyuk, Laurila, Tiia M., Zhou, Ying, Dada, Lubna, Sulo, Juha, Flagan, Richard C., Kulmala, Markku, Petäjä, Tuukka, and Lehtipalo, Katrianne
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- 2020
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12. The role of low-volatility organic compounds in initial particle growth in the atmosphere
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Tröstl, Jasmin, Chuang, Wayne K, Gordon, Hamish, Heinritzi, Martin, Yan, Chao, Molteni, Ugo, Ahlm, Lars, Frege, Carla, Bianchi, Federico, Wagner, Robert, Simon, Mario, Lehtipalo, Katrianne, Williamson, Christina, Craven, Jill S, Duplissy, Jonathan, Adamov, Alexey, Almeida, Joao, Bernhammer, Anne-Kathrin, Breitenlechner, Martin, Brilke, Sophia, Dias, Antònio, Ehrhart, Sebastian, Flagan, Richard C, Franchin, Alessandro, Fuchs, Claudia, Guida, Roberto, Gysel, Martin, Hansel, Armin, Hoyle, Christopher R, Jokinen, Tuija, Junninen, Heikki, Kangasluoma, Juha, Keskinen, Helmi, Kim, Jaeseok, Krapf, Manuel, Kürten, Andreas, Laaksonen, Ari, Lawler, Michael, Leiminger, Markus, Mathot, Serge, Möhler, Ottmar, Nieminen, Tuomo, Onnela, Antti, Petäjä, Tuukka, Piel, Felix M, Miettinen, Pasi, Rissanen, Matti P, Rondo, Linda, Sarnela, Nina, Schobesberger, Siegfried, Sengupta, Kamalika, Sipilä, Mikko, Smith, James N, Steiner, Gerhard, Tomè, Antònio, Virtanen, Annele, Wagner, Andrea C, Weingartner, Ernest, Wimmer, Daniela, Winkler, Paul M, Ye, Penglin, Carslaw, Kenneth S, Curtius, Joachim, Dommen, Josef, Kirkby, Jasper, Kulmala, Markku, Riipinen, Ilona, Worsnop, Douglas R, Donahue, Neil M, and Baltensperger, Urs
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General Science & Technology - Abstract
About half of present-day cloud condensation nuclei originate from atmospheric nucleation, frequently appearing as a burst of new particles near midday. Atmospheric observations show that the growth rate of new particles often accelerates when the diameter of the particles is between one and ten nanometres. In this critical size range, new particles are most likely to be lost by coagulation with pre-existing particles, thereby failing to form new cloud condensation nuclei that are typically 50 to 100 nanometres across. Sulfuric acid vapour is often involved in nucleation but is too scarce to explain most subsequent growth, leaving organic vapours as the most plausible alternative, at least in the planetary boundary layer. Although recent studies predict that low-volatility organic vapours contribute during initial growth, direct evidence has been lacking. The accelerating growth may result from increased photolytic production of condensable organic species in the afternoon, and the presence of a possible Kelvin (curvature) effect, which inhibits organic vapour condensation on the smallest particles (the nano-Köhler theory), has so far remained ambiguous. Here we present experiments performed in a large chamber under atmospheric conditions that investigate the role of organic vapours in the initial growth of nucleated organic particles in the absence of inorganic acids and bases such as sulfuric acid or ammonia and amines, respectively. Using data from the same set of experiments, it has been shown that organic vapours alone can drive nucleation. We focus on the growth of nucleated particles and find that the organic vapours that drive initial growth have extremely low volatilities (saturation concentration less than 10(-4.5) micrograms per cubic metre). As the particles increase in size and the Kelvin barrier falls, subsequent growth is primarily due to more abundant organic vapours of slightly higher volatility (saturation concentrations of 10(-4.5) to 10(-0.5) micrograms per cubic metre). We present a particle growth model that quantitatively reproduces our measurements. Furthermore, we implement a parameterization of the first steps of growth in a global aerosol model and find that concentrations of atmospheric cloud concentration nuclei can change substantially in response, that is, by up to 50 per cent in comparison with previously assumed growth rate parameterizations.
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- 2016
13. The effect of acid-base clustering and ions on the growth of atmospheric nano-particles.
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Lehtipalo, Katrianne, Rondo, Linda, Kontkanen, Jenni, Schobesberger, Siegfried, Jokinen, Tuija, Sarnela, Nina, Kürten, Andreas, Ehrhart, Sebastian, Franchin, Alessandro, Nieminen, Tuomo, Riccobono, Francesco, Sipilä, Mikko, Yli-Juuti, Taina, Duplissy, Jonathan, Adamov, Alexey, Ahlm, Lars, Almeida, João, Amorim, Antonio, Bianchi, Federico, Breitenlechner, Martin, Dommen, Josef, Downard, Andrew J, Dunne, Eimear M, Flagan, Richard C, Guida, Roberto, Hakala, Jani, Hansel, Armin, Jud, Werner, Kangasluoma, Juha, Kerminen, Veli-Matti, Keskinen, Helmi, Kim, Jaeseok, Kirkby, Jasper, Kupc, Agnieszka, Kupiainen-Määttä, Oona, Laaksonen, Ari, Lawler, Michael J, Leiminger, Markus, Mathot, Serge, Olenius, Tinja, Ortega, Ismael K, Onnela, Antti, Petäjä, Tuukka, Praplan, Arnaud, Rissanen, Matti P, Ruuskanen, Taina, Santos, Filipe D, Schallhart, Simon, Schnitzhofer, Ralf, Simon, Mario, Smith, James N, Tröstl, Jasmin, Tsagkogeorgas, Georgios, Tomé, António, Vaattovaara, Petri, Vehkamäki, Hanna, Vrtala, Aron E, Wagner, Paul E, Williamson, Christina, Wimmer, Daniela, Winkler, Paul M, Virtanen, Annele, Donahue, Neil M, Carslaw, Kenneth S, Baltensperger, Urs, Riipinen, Ilona, Curtius, Joachim, Worsnop, Douglas R, and Kulmala, Markku
- Abstract
The growth of freshly formed aerosol particles can be the bottleneck in their survival to cloud condensation nuclei. It is therefore crucial to understand how particles grow in the atmosphere. Insufficient experimental data has impeded a profound understanding of nano-particle growth under atmospheric conditions. Here we study nano-particle growth in the CLOUD (Cosmics Leaving OUtdoors Droplets) chamber, starting from the formation of molecular clusters. We present measured growth rates at sub-3 nm sizes with different atmospherically relevant concentrations of sulphuric acid, water, ammonia and dimethylamine. We find that atmospheric ions and small acid-base clusters, which are not generally accounted for in the measurement of sulphuric acid vapour, can participate in the growth process, leading to enhanced growth rates. The availability of compounds capable of stabilizing sulphuric acid clusters governs the magnitude of these effects and thus the exact growth mechanism. We bring these observations into a coherent framework and discuss their significance in the atmosphere.
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- 2016
14. Stratocumulus Cloud Clearings and Notable Thermodynamic and Aerosol Contrasts across the Clear–Cloudy Interface
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Crosbie, Ewan, Wang, Zhen, Sorooshian, Armin, Chuang, Patrick Y, Craven, Jill S, Coggon, Matthew M, Brunke, Michael, Zeng, Xubin, Jonsson, Haflidi, Woods, Roy K, Flagan, Richard C, and Seinfeld, John H
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Aircraft observations ,Atm/Ocean Structure/ Phenomena ,North Pacific Ocean ,Thermodynamics ,Physical Meteorology and Climatology ,Cloud cover ,Observational techniques and algorithms ,Aerosols ,Boundary layer ,Geographic location/entity ,Atmospheric Sciences ,Meteorology & Atmospheric Sciences - Abstract
Abstract Data from three research flights, conducted over water near the California coast, are used to investigate the boundary between stratocumulus cloud decks and clearings of different sizes. Large clearings exhibit a diurnal cycle with growth during the day and contraction overnight and a multiday life cycle that can include oscillations between growth and decay, whereas a small coastal clearing was observed to be locally confined with a subdiurnal lifetime. Subcloud aerosol characteristics are similar on both sides of the clear–cloudy boundary in the three cases, while meteorological properties exhibit subtle, yet important, gradients, implying that dynamics, and not microphysics, is the primary driver for the clearing characteristics. Transects, made at multiple levels across the cloud boundary during one flight, highlight the importance of microscale (~1 km) structure in thermodynamic properties near the cloud edge, suggesting that dynamic forcing at length scales comparable to the convective eddy scale may be influential to the larger-scale characteristics of the clearing. These results have implications for modeling and observational studies of marine boundary layer clouds, especially in relation to aerosol–cloud interactions and scales of variability responsible for the evolution of stratocumulus clearings.
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- 2016
15. Quantification of face seal leakage using parallel resistance model
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Pushpawela, Buddhi, primary, Chea, Peter, additional, Ward, Ryan, additional, and Flagan, Richard C., additional
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- 2023
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16. Electrospray synthesis and in-situ sizing of nanoparticulate CsH 2 PO 4
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Varga, Áron, primary, Downard, Andrew J., additional, Evoen, Vanessa, additional, Giapis, Konstantinos P., additional, Flagan, Richard C., additional, and Haile, Sossina M., additional
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- 2023
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17. Under What Conditions Can Equilibrium Gas–Particle Partitioning Be Expected to Hold in the Atmosphere?
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Mai, Huajun, Shiraiwa, Manabu, Flagan, Richard C, and Seinfeld, John H
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Aerosols ,Atmosphere ,Diffusion ,Gases ,Models ,Theoretical ,Particle Size ,Volatilization ,Environmental Sciences - Abstract
The prevailing treatment of secondary organic aerosol formation in atmospheric models is based on the assumption of instantaneous gas-particle equilibrium for the condensing species, yet compelling experimental evidence indicates that organic aerosols can exhibit the properties of highly viscous, semisolid particles, for which gas-particle equilibrium may be achieved slowly. The approach to gas-particle equilibrium partitioning is controlled by gas-phase diffusion, interfacial transport, and particle-phase diffusion. Here we evaluate the controlling processes and the time scale to achieve gas-particle equilibrium as a function of the volatility of the condensing species, its surface accommodation coefficient, and its particle-phase diffusivity. For particles in the size range of typical atmospheric organic aerosols (∼50-500 nm), the time scale to establish gas-particle equilibrium is generally governed either by interfacial accommodation or particle-phase diffusion. The rate of approach to equilibrium varies, depending on whether the bulk vapor concentration is constant, typical of an open system, or decreasing as a result of condensation into the particles, typical of a closed system.
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- 2015
18. Rapid growth of new atmospheric particles by nitric acid and ammonia condensation
- Author
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Wang, Mingyi, Kong, Weimeng, Marten, Ruby, He, Xu-Cheng, Chen, Dexian, Pfeifer, Joschka, Heitto, Arto, Kontkanen, Jenni, Dada, Lubna, Kürten, Andreas, Yli-Juuti, Taina, Manninen, Hanna E., Amanatidis, Stavros, Amorim, António, Baalbaki, Rima, Baccarini, Andrea, Bell, David M., Bertozzi, Barbara, Bräkling, Steffen, Brilke, Sophia, Murillo, Lucía Caudillo, Chiu, Randall, Chu, Biwu, De Menezes, Louis-Philippe, Duplissy, Jonathan, Finkenzeller, Henning, Carracedo, Loic Gonzalez, Granzin, Manuel, Guida, Roberto, Hansel, Armin, Hofbauer, Victoria, Krechmer, Jordan, Lehtipalo, Katrianne, Lamkaddam, Houssni, Lampimäki, Markus, Lee, Chuan Ping, Makhmutov, Vladimir, Marie, Guillaume, Mathot, Serge, Mauldin, Roy L., Mentler, Bernhard, Müller, Tatjana, Onnela, Antti, Partoll, Eva, Petäjä, Tuukka, Philippov, Maxim, Pospisilova, Veronika, Ranjithkumar, Ananth, Rissanen, Matti, Rörup, Birte, Scholz, Wiebke, Shen, Jiali, Simon, Mario, Sipilä, Mikko, Steiner, Gerhard, Stolzenburg, Dominik, Tham, Yee Jun, Tomé, António, Wagner, Andrea C., Wang, Dongyu S., Wang, Yonghong, Weber, Stefan K., Winkler, Paul M., Wlasits, Peter J., Wu, Yusheng, Xiao, Mao, Ye, Qing, Zauner-Wieczorek, Marcel, Zhou, Xueqin, Volkamer, Rainer, Riipinen, Ilona, Dommen, Josef, Curtius, Joachim, Baltensperger, Urs, Kulmala, Markku, Worsnop, Douglas R., Kirkby, Jasper, Seinfeld, John H., El-Haddad, Imad, Flagan, Richard C., and Donahue, Neil M.
- Published
- 2020
- Full Text
- View/download PDF
19. Electrospray synthesis and in-situ sizing of nanoparticulate CsH2PO4.
- Author
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Varga, Áron, Downard, Andrew J., Evoen, Vanessa, Giapis, Konstantinos P., Flagan, Richard C., and Haile, Sossina M.
- Subjects
SOLID electrolytes ,GAS flow ,SULFURIC acid ,SURFACE tension ,AEROSOLS - Abstract
Nanometer-sized particles of the solid acid electrolyte material CsH
2 PO4 have been prepared by electrospray synthesis. Using a differential mobility analyzer to provide real-time particle-size information, the role of electrospray parameters, such as precursor solution composition, surface tension, and conductivity, sheath gas temperature and flow rate, and solution flow rate, were evaluated. The results are compared with particle sizes calculated using well-established scaling laws. The much smaller sizes of the detected particles in comparison to the sizes expected from the predicted initial droplet sizes suggests that droplets undergo fission along the path toward deposition. In flight fission events may also explain the observed counterintuitive result that aerosol particle size decreases with increasing solute concentration. The in situ feedback provided by this system enabled rapid identification of solution and process parameters that result in mean particle sizes of ∼15 nm, substantially smaller than any prior results. Copyright © 2023 American Association for Aerosol Research [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
20. Worldwide data sets constrain the water vapor uptake coefficient in cloud formation
- Author
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Raatikainen, Tomi, Nenes, Athanasios, Seinfeld, John H, Morales, Ricardo, Moore, Richard H, Lathem, Terry L, Lance, Sara, Padró, Luz T, Lin, Jack J, Cerully, Kate M, Bougiatioti, Aikaterini, Cozic, Julie, Ruehl, Christopher R, Chuang, Patrick Y, Anderson, Bruce E, Flagan, Richard C, Jonsson, Haflidi, Mihalopoulos, Nikos, and Smith, James N
- Subjects
Climate Action ,global climate ,hydrological cycle ,precipitation - Abstract
Cloud droplet formation depends on the condensation of water vapor on ambient aerosols, the rate of which is strongly affected by the kinetics of water uptake as expressed by the condensation (or mass accommodation) coefficient, αc. Estimates of αc for droplet growth from activation of ambient particles vary considerably and represent a critical source of uncertainty in estimates of global cloud droplet distributions and the aerosol indirect forcing of climate. We present an analysis of 10 globally relevant data sets of cloud condensation nuclei to constrain the value of αc for ambient aerosol. We find that rapid activation kinetics (αc > 0.1) is uniformly prevalent. This finding resolves a long-standing issue in cloud physics, as the uncertainty in water vapor accommodation on droplets is considerably less than previously thought.
- Published
- 2013
21. Evidence for the Predominance of Mid-Tropospheric Aerosols as Subtropical Anvil Cloud Nuclei
- Author
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Fridlind, Ann M., Ackerman, Andrew S., Jensen, Eric J., Heymsfield, Andrew J., Poellot, Michael R., Stevens, David E., Wang, Donghai, Miloshevich, Larry M., Baumgardner, Darrel, Lawson, R. Paul, Wilson, James C., Flagan, Richard C., Seinfeld, John H., Jonsson, Haflidi H., VanReken, Timothy M., Varutbangkul, Varuntida, and Rissman, Tracey A.
- Published
- 2004
22. Comprehensive Simultaneous Shipboard and Airborne Characterization of Exhaust from a Modern Container Ship at Sea
- Author
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Murphy, Shane M, Agrawal, Harshit, Sorooshian, Armin, Padro, Luz T, Gates, Harmony, Hersey, Scott, Welch, W. A, Jung, H., Miller, J. W, Cocker, David R, Nenes, Athanasios, Jonsson, Haflidi H, Flagan, Richard C, and Seinfeld, John H
- Published
- 2009
23. An intercomparison study of four different techniques for measuring the chemical composition of nanoparticles
- Author
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Caudillo, Lucía, primary, Surdu, Mihnea, additional, Lopez, Brandon, additional, Wang, Mingyi, additional, Thoma, Markus, additional, Bräkling, Steffen, additional, Buchholz, Angela, additional, Simon, Mario, additional, Wagner, Andrea C., additional, Müller, Tatjana, additional, Granzin, Manuel, additional, Heinritzi, Martin, additional, Amorim, Antonio, additional, Bell, David M., additional, Brasseur, Zoé, additional, Dada, Lubna, additional, Duplissy, Jonathan, additional, Finkenzeller, Henning, additional, He, Xu-Cheng, additional, Lamkaddam, Houssni, additional, Mahfouz, Naser G. A., additional, Makhmutov, Vladimir, additional, Manninen, Hanna E., additional, Marie, Guillaume, additional, Marten, Ruby, additional, Mauldin, Roy L., additional, Mentler, Bernhard, additional, Onnela, Antti, additional, Petäjä, Tuukka, additional, Pfeifer, Joschka, additional, Philippov, Maxim, additional, Piedehierro, Ana A., additional, Rörup, Birte, additional, Scholz, Wiebke, additional, Shen, Jiali, additional, Stolzenburg, Dominik, additional, Tauber, Christian, additional, Tian, Ping, additional, Tomé, António, additional, Umo, Nsikanabasi Silas, additional, Wang, Dongyu S., additional, Wang, Yonghong, additional, Weber, Stefan K., additional, Welti, André, additional, Zauner-Wieczorek, Marcel, additional, Baltensperger, Urs, additional, Flagan, Richard C., additional, Hansel, Armin, additional, Kirkby, Jasper, additional, Kulmala, Markku, additional, Lehtipalo, Katrianne, additional, Worsnop, Douglas R., additional, Haddad, Imad El, additional, Donahue, Neil M., additional, Vogel, Alexander L., additional, Kürten, Andreas, additional, and Curtius, Joachim, additional
- Published
- 2023
- Full Text
- View/download PDF
24. Global atmospheric particle formation from CERN CLOUD measurements
- Author
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Dunne, Eimear M., Gordon, Hamish, Kürten, Andreas, Almeida, João, Duplissy, Jonathan, Williamson, Christina, Ortega, Ismael K., Pringle, Kirsty J., Adamov, Alexey, Baltensperger, Urs, Barmet, Peter, Benduhn, Francois, Bianchi, Federico, Breitenlechner, Martin, Clarke, Antony, Curtius, Joachim, Dommen, Josef, Donahue, Neil M., Ehrhart, Sebastian, Flagan, Richard C., Franchin, Alessandro, Guida, Roberto, Hakala, Jani, Hansel, Armin, Heinritzi, Martin, Jokinen, Tuija, Kangasluoma, Juha, Kirkby, Jasper, Kulmala, Markku, Kupc, Agnieszka, Lawler, Michael J., Lehtipalo, Katrianne, Makhmutov, Vladimir, Mann, Graham, Mathot, Serge, Merikanto, Joonas, Miettinen, Pasi, Nenes, Athanasios, Onnela, Antti, Rap, Alexandra, Reddington, Carly L. S., Riccobono, Francesco, Richards, Nigel A. D., Rissanen, Matti P., Rondo, Linda, Sarnela, Nina, Schobesberger, Siegfried, Sengupta, Kamalika, Simon, Mario, Sipilä, Mikko, Smith, James N., Stozkhov, Yuri, Tomé, Antonio, Tröstl, Jasmin, Wagner, Paul E., Wimmer, Daniela, Winkler, Paul M., Worsnop, Douglas R., and Carslaw, Kenneth S.
- Published
- 2016
25. Reduced anthropogenic aerosol radiative forcing caused by biogenic new particle formation
- Author
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Gordon, Hamish, Sengupta, Kamalika, Rap, Alexandru, Duplissy, Jonathan, Frege, Carla, Williamson, Christina, Heinritzi, Martin, Simon, Mario, Yan, Chao, Almeida, João, Tröstl, Jasmin, Nieminen, Tuomo, Ortega, Ismael K., Wagner, Robert, Dunne, Eimear M., Adamov, Alexey, Amorim, Antonio, Bernhammer, Anne-Kathrin, Bianchi, Federico, Breitenlechner, Martin, Brilke, Sophia, Chen, Xuemeng, Craven, Jill S., Dias, Antonio, Ehrhart, Sebastian, Fischer, Lukas, Flagan, Richard C., Franchin, Alessandro, Fuchs, Claudia, Guida, Roberto, Hakala, Jani, Hoyle, Christopher R., Jokinen, Tuija, Junninen, Heikki, Kangasluoma, Juha, Kim, Jaeseok, Kirkby, Jasper, Krapf, Manuel, Kürten, Andreas, Laaksonen, Ari, Lehtipalo, Katrianne, Makhmutov, Vladimir, Mathot, Serge, Molteni, Ugo, Monks, Sarah A., Onnela, Antti, Peräkylä, Otso, Piel, Felix, Petäjä, Tuukka, Praplan, Arnaud P., Pringle, Kirsty J., Richards, Nigel A. D., Rissanen, Matti P., Rondo, Linda, Sarnela, Nina, Schobesberger, Siegfried, Scott, Catherine E., Seinfeld, John H., Sharma, Sangeeta, Sipilä, Mikko, Steiner, Gerhard, Stozhkov, Yuri, Stratmann, Frank, Tomé, Antonio, Virtanen, Annele, Vogel, Alexander Lucas, Wagner, Andrea C., Wagner, Paul E., Weingartner, Ernest, Wimmer, Daniela, Winkler, Paul M., Ye, Penglin, Zhang, Xuan, Hansel, Armin, Dommen, Josef, Donahue, Neil M., Worsnop, Douglas R., Baltensperger, Urs, Kulmala, Markku, Curtius, Joachim, and Carslaw, Kenneth S.
- Published
- 2016
26. Temperature, humidity, and ionisation effect of iodine oxoacid nucleation
- Author
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Rörup, Birte, He, Xu-Cheng, Shen, Jiali, Baalbaki, Rima, Dada, Lubna, Sipilä, Mikko, Kirkby, Jasper, Kulmala, Markku, Amorim, Antonio, Baccarini, Andrea, Bell, David M., Caudillo-Plath, Lucía, Duplissy, Jonathan, Finkenzeller, Henning, Kürten, Andreas, Lamkaddam, Houssni, Lee, Chuan Ping, Makhmutov, Vladimir, Manninen, Hanna E., Marie, Guillaume, Marten, Ruby, Mentler, Bernhard, Onnela, Antti, Philippov, Maxim, Scholz, Carolin Wiebke, Simon, Mario, Stolzenburg, Dominik, Tham, Yee Jun, Tomé, António, Wagner, Andrea C., Wang, Mingyi, Wang, Dongyu, Wang, Yonghong, Weber, Stefan K., Zauner-Wieczorek, Marcel, Baltensperger, Urs, Curtius, Joachim, Donahue, Neil M., El Haddad, Imad, Flagan, Richard C., Hansel, Armin, Möhler, Ottmar, Petäjä, Tuukka, Volkamer, Rainer, Worsnop, Douglas, and Lehtipalo, Katrianne
- Abstract
Iodine oxoacids are recognised for their significant contribution to the formation of new particles in marine and polar atmospheres. Nevertheless, to incorporate the iodine oxoacid nucleation mechanism into global simulations, it is essential to comprehend how this mechanism varies under various atmospheric conditions. In this study, we combined measurements from the CLOUD (Cosmic Leaving OUtdoor Droplets) chamber at CERN and simulations with a kinetic model to investigate the impact of temperature, ionisation, and humidity on iodine oxoacid nucleation. Our findings reveal that ion-induced particle formation rates remain largely unaffected by changes in temperature. However, neutral particle formation rates experience a significant increase when the temperature drops from +10 °C to −10 °C. Running the kinetic model with varying ionisation rates demonstrates that the particle formation rate only increases with a higher ionisation rate when the iodic acid concentration exceeds 1.5 × 107cm−3, a concentration rarely reached in pristine marine atmospheres. Consequently, our simulations suggest that, despite higher ionisation rates, the charged cluster nucleation pathway of iodic acid is unlikely to be enhanced in the upper troposphere by higher ionisation rates. Instead, the neutral nucleation channel is likely to be the dominant channel in that region. Notably, the iodine oxoacid nucleation mechanism remains unaffected by changes in relative humidity from 2% to 80%. However, under unrealistically dry conditions (below 0.008% RH at +10 °C), iodine oxides (I2O4and I2O5) significantly enhance formation rates. Therefore, we conclude that iodine oxoacid nucleation is the dominant nucleation mechanism for iodine nucleation in the marine and polar boundary layer atmosphere.
- Published
- 2024
- Full Text
- View/download PDF
27. Measurement of the collision rate coefficients between atmospheric ions and multiply charged aerosol particles in the CERN CLOUD chamber
- Author
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Pfeifer, Joschka, Mahfouz, Naser G. A., Schulze, Benjamin C., Mathot, Serge, Stolzenburg, Dominik, Baalbaki, Rima, Brasseur, Zoé, Caudillo, Lucia, Dada, Lubna, Granzin, Manuel, He, Xu-Cheng, Lamkaddam, Houssni, Lopez, Brandon, Makhmutov, Vladimir, Marten, Ruby, Mentler, Bernhard, Müller, Tatjana, Onnela, Antti, Philippov, Maxim, Piedehierro, Ana A., Rörup, Birte, Schervish, Meredith, Tian, Ping, Umo, Nsikanabasi S., Wang, Dongyu S., Wang, Mingyi, Weber, Stefan K., Welti, André, Wu, Yusheng, Zauner-Wieczorek, Marcel, Amorim, Antonio, Haddad, Imad, Kulmala, Markku, Lehtipalo, Katrianne, Petäjä, Tuukka, Tomé, António, Mirme, Sander, Manninen, Hanna E., Donahue, Neil M., Flagan, Richard C., Kürten, Andreas, Curtius, Joachim, and Kirkby, Jasper
- Abstract
Aerosol particles have an important role in Earth's radiation balance and climate, both directly and indirectly through aerosol–cloud interactions. Most aerosol particles in the atmosphere are weakly charged, affecting both their collision rates with ions and neutral molecules, as well as the rates by which they are scavenged by other aerosol particles and cloud droplets. The rate coefficients between ions and aerosol particles are important since they determine the growth rates and lifetimes of ions and charged aerosol particles, and so they may influence cloud microphysics, dynamics, and aerosol processing. However, despite their importance, very few experimental measurements exist of charged aerosol collision rates under atmospheric conditions, where galactic cosmic rays in the lower troposphere give rise to ion pair concentrations of around 1000 cm−3. Here we present measurements in the CERN CLOUD chamber of the rate coefficients between ions and small ( nm) aerosol particles containing up to 9 elementary charges, e. We find the rate coefficient of a singly charged ion with an oppositely charged particle increases from 2.0 (0.4–4.4) × 10−6 cm3 s−1 to 30.6 (24.9–45.1) × 10−6 cm3 s−1 for particles with charges of 1 to 9 e, respectively, where the parentheses indicate the ±1σ uncertainty interval. Our measurements are compatible with theoretical predictions and show excellent agreement with the model of Gatti and Kortshagen (2008).
- Published
- 2023
28. Formation and evolution of molecular products in α-pinene secondary organic aerosol
- Author
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Zhang, Xuan, McVay, Renee C., Huang, Dan D., Dalleska, Nathan F., Aumont, Bernard, Flagan, Richard C., and Seinfeld, John H.
- Published
- 2015
29. Supplementary material to "Measurement of the rate coefficients between atmospheric ions and multiply charged aerosol particles in the CERN CLOUD chamber"
- Author
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Pfeifer, Joschka, primary, Mahfouz, Naser G., additional, Schulze, Ben, additional, Mathot, Serge, additional, Stolzenburg, Dominik, additional, Baalbaki, Rima, additional, Brasseur, Zoé, additional, Caudillo, Lucia, additional, Dada, Lubna, additional, Granzin, Manuel, additional, He, Xu-Cheng, additional, Lamkaddam, Houssni, additional, Lopez, Brandon, additional, Makhmutov, Vladimir, additional, Marten, Ruby, additional, Mentler, Bernhard, additional, Müller, Tatjana, additional, Onnela, Antti, additional, Philippov, Maxim, additional, Piedehierro, Ana A., additional, Rörup, Birte, additional, Schervish, Meredith, additional, Tian, Ping, additional, Umo, Nsikanabasi S., additional, Wang, Dongyu S., additional, Wang, Mingyi, additional, Weber, Stefan K., additional, Welti, André, additional, Wu, Yusheng, additional, Zauner-Wieczorek, Marcel, additional, Amorim, Antonio, additional, El Haddad, Imad, additional, Kulmala, Markku, additional, Lehtipalo, Katrianne, additional, Petäjä, Tuukka, additional, Tomé, António, additional, Mirme, Sander, additional, Manninen, Hanna E., additional, Donahue, Neil M., additional, Flagan, Richard C., additional, Kürten, Andreas, additional, Curtius, Joachim, additional, and Kirkby, Jasper, additional
- Published
- 2022
- Full Text
- View/download PDF
30. Measurement of the rate coefficients between atmospheric ions and multiply charged aerosol particles in the CERN CLOUD chamber
- Author
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Pfeifer, Joschka, primary, Mahfouz, Naser G., additional, Schulze, Ben, additional, Mathot, Serge, additional, Stolzenburg, Dominik, additional, Baalbaki, Rima, additional, Brasseur, Zoé, additional, Caudillo, Lucia, additional, Dada, Lubna, additional, Granzin, Manuel, additional, He, Xu-Cheng, additional, Lamkaddam, Houssni, additional, Lopez, Brandon, additional, Makhmutov, Vladimir, additional, Marten, Ruby, additional, Mentler, Bernhard, additional, Müller, Tatjana, additional, Onnela, Antti, additional, Philippov, Maxim, additional, Piedehierro, Ana A., additional, Rörup, Birte, additional, Schervish, Meredith, additional, Tian, Ping, additional, Umo, Nsikanabasi S., additional, Wang, Dongyu S., additional, Wang, Mingyi, additional, Weber, Stefan K., additional, Welti, André, additional, Wu, Yusheng, additional, Zauner-Wieczorek, Marcel, additional, Amorim, Antonio, additional, El Haddad, Imad, additional, Kulmala, Markku, additional, Lehtipalo, Katrianne, additional, Petäjä, Tuukka, additional, Tomé, António, additional, Mirme, Sander, additional, Manninen, Hanna E., additional, Donahue, Neil M., additional, Flagan, Richard C., additional, Kürten, Andreas, additional, Curtius, Joachim, additional, and Kirkby, Jasper, additional
- Published
- 2022
- Full Text
- View/download PDF
31. The gas-phase formation mechanism of iodic acid as an atmospheric aerosol source
- Author
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Finkenzeller, Henning, primary, Iyer, Siddharth, additional, He, Xu-Cheng, additional, Simon, Mario, additional, Koenig, Theodore K., additional, Lee, Christopher F., additional, Valiev, Rashid, additional, Hofbauer, Victoria, additional, Amorim, Antonio, additional, Baalbaki, Rima, additional, Baccarini, Andrea, additional, Beck, Lisa, additional, Bell, David M., additional, Caudillo, Lucía, additional, Chen, Dexian, additional, Chiu, Randall, additional, Chu, Biwu, additional, Dada, Lubna, additional, Duplissy, Jonathan, additional, Heinritzi, Martin, additional, Kemppainen, Deniz, additional, Kim, Changhyuk, additional, Krechmer, Jordan, additional, Kürten, Andreas, additional, Kvashnin, Alexandr, additional, Lamkaddam, Houssni, additional, Lee, Chuan Ping, additional, Lehtipalo, Katrianne, additional, Li, Zijun, additional, Makhmutov, Vladimir, additional, Manninen, Hanna E., additional, Marie, Guillaume, additional, Marten, Ruby, additional, Mauldin, Roy L., additional, Mentler, Bernhard, additional, Müller, Tatjana, additional, Petäjä, Tuukka, additional, Philippov, Maxim, additional, Ranjithkumar, Ananth, additional, Rörup, Birte, additional, Shen, Jiali, additional, Stolzenburg, Dominik, additional, Tauber, Christian, additional, Tham, Yee Jun, additional, Tomé, António, additional, Vazquez-Pufleau, Miguel, additional, Wagner, Andrea C., additional, Wang, Dongyu S., additional, Wang, Mingyi, additional, Wang, Yonghong, additional, Weber, Stefan K., additional, Nie, Wei, additional, Wu, Yusheng, additional, Xiao, Mao, additional, Ye, Qing, additional, Zauner-Wieczorek, Marcel, additional, Hansel, Armin, additional, Baltensperger, Urs, additional, Brioude, Jérome, additional, Curtius, Joachim, additional, Donahue, Neil M., additional, Haddad, Imad El, additional, Flagan, Richard C., additional, Kulmala, Markku, additional, Kirkby, Jasper, additional, Sipilä, Mikko, additional, Worsnop, Douglas R., additional, Kurten, Theo, additional, Rissanen, Matti, additional, and Volkamer, Rainer, additional
- Published
- 2022
- Full Text
- View/download PDF
32. Neutral molecular cluster formation of sulfuric acid-dimethylamine observed in real time under atmospheric conditions
- Author
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Kürten, Andreas, Jokinen, Tuija, Simon, Mario, Sipilä, Mikko, Sarnela, Nina, Junninen, Heikki, Adamov, Alexey, Almeida, João, Amorim, Antonio, Bianchi, Federico, Breitenlechner, Martin, Dommen, Josef, Donahue, Neil M., Duplissy, Jonathan, Ehrhart, Sebastian, Flagan, Richard C., Franchin, Alessandro, Hakala, Jani, Hansel, Armin, Heinritzi, Martin, Hutterli, Manuel, Kangasluoma, Juha, Kirkby, Jasper, Laaksonen, Ari, Lehtipalo, Katrianne, Leiminger, Markus, Makhmutov, Vladimir, Mathot, Serge, Onnela, Antti, Petäjä, Tuukka, Praplan, Arnaud P., Riccobono, Francesco, Rissanen, Matti P., Rondo, Linda, Schobesberger, Siegfried, Seinfeld, John H., Steiner, Gerhard, Tomé, António, Tröstl, Jasmin, Winkler, Paul M., Williamson, Christina, Wimmer, Daniela, Ye, Penglin, Baltensperger, Urs, Carslaw, Kenneth S., Kulmala, Markku, Worsnop, Douglas R., and Curtius, Joachim
- Published
- 2014
33. High Gas-Phase Methanesulfonic Acid Production in the OH-Initiated Oxidation of Dimethyl Sulfide at Low Temperatures
- Author
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Shen, Jiali, primary, Scholz, Wiebke, additional, He, Xu-Cheng, additional, Zhou, Putian, additional, Marie, Guillaume, additional, Wang, Mingyi, additional, Marten, Ruby, additional, Surdu, Mihnea, additional, Rörup, Birte, additional, Baalbaki, Rima, additional, Amorim, Antonio, additional, Ataei, Farnoush, additional, Bell, David M., additional, Bertozzi, Barbara, additional, Brasseur, Zoé, additional, Caudillo, Lucía, additional, Chen, Dexian, additional, Chu, Biwu, additional, Dada, Lubna, additional, Duplissy, Jonathan, additional, Finkenzeller, Henning, additional, Granzin, Manuel, additional, Guida, Roberto, additional, Heinritzi, Martin, additional, Hofbauer, Victoria, additional, Iyer, Siddharth, additional, Kemppainen, Deniz, additional, Kong, Weimeng, additional, Krechmer, Jordan E., additional, Kürten, Andreas, additional, Lamkaddam, Houssni, additional, Lee, Chuan Ping, additional, Lopez, Brandon, additional, Mahfouz, Naser G. A., additional, Manninen, Hanna E., additional, Massabò, Dario, additional, Mauldin, Roy L., additional, Mentler, Bernhard, additional, Müller, Tatjana, additional, Pfeifer, Joschka, additional, Philippov, Maxim, additional, Piedehierro, Ana A., additional, Roldin, Pontus, additional, Schobesberger, Siegfried, additional, Simon, Mario, additional, Stolzenburg, Dominik, additional, Tham, Yee Jun, additional, Tomé, António, additional, Umo, Nsikanabasi Silas, additional, Wang, Dongyu, additional, Wang, Yonghong, additional, Weber, Stefan K., additional, Welti, André, additional, Wollesen de Jonge, Robin, additional, Wu, Yusheng, additional, Zauner-Wieczorek, Marcel, additional, Zust, Felix, additional, Baltensperger, Urs, additional, Curtius, Joachim, additional, Flagan, Richard C., additional, Hansel, Armin, additional, Möhler, Ottmar, additional, Petäjä, Tuukka, additional, Volkamer, Rainer, additional, Kulmala, Markku, additional, Lehtipalo, Katrianne, additional, Rissanen, Matti, additional, Kirkby, Jasper, additional, El-Haddad, Imad, additional, Bianchi, Federico, additional, Sipilä, Mikko, additional, Donahue, Neil M., additional, and Worsnop, Douglas R., additional
- Published
- 2022
- Full Text
- View/download PDF
34. An intercomparison study of four different techniques for measuring the chemical composition of nanoparticles
- Author
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Caudillo, Lucía, primary, Surdu, Mihnea, additional, Lopez, Brandon, additional, Wang, Mingyi, additional, Thoma, Markus, additional, Bräkling, Steffen, additional, Buchholz, Angela, additional, Simon, Mario, additional, Wagner, Andrea C., additional, Müller, Tatjana, additional, Granzin, Manuel, additional, Heinritzi, Martin, additional, Amorim, Antonio, additional, Bell, David M., additional, Brasseur, Zoé, additional, Dada, Lubna, additional, Duplissy, Jonathan, additional, Finkenzeller, Henning, additional, He, Xu-Cheng, additional, Lamkaddam, Houssni, additional, Mahfouz, Naser G. A., additional, Makhmutov, Vladimir, additional, Manninen, Hanna E., additional, Marie, Guillaume, additional, Marten, Ruby, additional, Mauldin, Roy L., additional, Mentler, Bernhard, additional, Onnela, Antti, additional, Petäjä, Tuukka, additional, Pfeifer, Joschka, additional, Philippov, Maxim, additional, Piedehierro, Ana A., additional, Rörup, Birte, additional, Scholz, Wiebke, additional, Shen, Jiali, additional, Stolzenburg, Dominik, additional, Tauber, Christian, additional, Tian, Ping, additional, Tomé, António, additional, Umo, Nsikanabasi Silas, additional, Wang, Dongyu S., additional, Wang, Yonghong, additional, Weber, Stefan K., additional, Welti, André, additional, Zauner-Wieczorek, Marcel, additional, Baltensperger, Urs, additional, Flagan, Richard C., additional, Hansel, Armin, additional, Kirkby, Jasper, additional, Kulmala, Markku, additional, Lehtipalo, Katrianne, additional, Worsnop, Douglas R., additional, Haddad, Imad El, additional, Donahue, Neil M., additional, Vogel, Alexander L., additional, Kürten, Andreas, additional, and Curtius, Joachim, additional
- Published
- 2022
- Full Text
- View/download PDF
35. Supplementary material to "An intercomparison study of four different techniques for measuring the chemical composition of nanoparticles"
- Author
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Caudillo, Lucía, primary, Surdu, Mihnea, additional, Lopez, Brandon, additional, Wang, Mingyi, additional, Thoma, Markus, additional, Bräkling, Steffen, additional, Buchholz, Angela, additional, Simon, Mario, additional, Wagner, Andrea C., additional, Müller, Tatjana, additional, Granzin, Manuel, additional, Heinritzi, Martin, additional, Amorim, Antonio, additional, Bell, David M., additional, Brasseur, Zoé, additional, Dada, Lubna, additional, Duplissy, Jonathan, additional, Finkenzeller, Henning, additional, He, Xu-Cheng, additional, Lamkaddam, Houssni, additional, Mahfouz, Naser G. A., additional, Makhmutov, Vladimir, additional, Manninen, Hanna E., additional, Marie, Guillaume, additional, Marten, Ruby, additional, Mauldin, Roy L., additional, Mentler, Bernhard, additional, Onnela, Antti, additional, Petäjä, Tuukka, additional, Pfeifer, Joschka, additional, Philippov, Maxim, additional, Piedehierro, Ana A., additional, Rörup, Birte, additional, Scholz, Wiebke, additional, Shen, Jiali, additional, Stolzenburg, Dominik, additional, Tauber, Christian, additional, Tian, Ping, additional, Tomé, António, additional, Umo, Nsikanabasi Silas, additional, Wang, Dongyu S., additional, Wang, Yonghong, additional, Weber, Stefan K., additional, Welti, André, additional, Zauner-Wieczorek, Marcel, additional, Baltensperger, Urs, additional, Flagan, Richard C., additional, Hansel, Armin, additional, Kirkby, Jasper, additional, Kulmala, Markku, additional, Lehtipalo, Katrianne, additional, Worsnop, Douglas R., additional, Haddad, Imad El, additional, Donahue, Neil M., additional, Vogel, Alexander L., additional, Kürten, Andreas, additional, and Curtius, Joachim, additional
- Published
- 2022
- Full Text
- View/download PDF
36. Oxidation Products of Biogenic Emissions Contribute to Nucleation of Atmospheric Particles
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Riccobono, Francesco, Schobesberger, Siegfried, Scott, Catherine E., Dommen, Josef, Ortega, Ismael K., Rondo, Linda, Almeida, João, Amorim, Antonio, Bianchi, Federico, Breitenlechner, Martin, David, André, Downard, Andrew, Dunne, Eimear M., Duplissy, Jonathan, Ehrhart, Sebastian, Flagan, Richard C., Franchin, Alessandro, Hansel, Armin, Junninen, Heikki, Kajos, Maija, Keskinen, Helmi, Kupc, Agnieszka, Kürten, Andreas, Kvashin, Alexander N., Laaksonen, Ari, Lehtipalo, Katrianne, Makhmutov, Vladimir, Mathot, Serge, Nieminen, Tuomo, Onnela, Antti, Petäjä, Tuukka, Praplan, Arnaud P., Santos, Filipe D., Schallhart, Simon, Seinfeld, John H., Sipilä, Mikko, Spracklen, Dominick V., Stozhkov, Yuri, Stratmann, Frank, Tomé, Antonio, Tsagkogeorgas, Georgios, Vaattovaara, Petri, Viisanen, Yrjö, Vrtala, Aron, Wagner, Paul E., Weingartner, Ernest, Wex, Heike, Wimmer, Daniela, Carslaw, Kenneth S., Curtius, Joachim, Donahue, Neil M., Kirkby, Jasper, Kulmala, Markku, Worsnop, Douglas R., and Baltensperger, Urs
- Published
- 2014
37. Science of the Environmental Chamber
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Schwantes, Rebecca H., primary, McVay, Renee C., additional, Zhang, Xuan, additional, Coggon, Matthew M., additional, Lignell, Hanna, additional, Flagan, Richard C., additional, Wennberg, Paul O., additional, and Seinfeld, John H., additional
- Published
- 2017
- Full Text
- View/download PDF
38. Molecular understanding of atmospheric particle formation from sulfuric acid and large oxidized organic molecules
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Schobesberger, Siegfried, Junninen, Heikki, Bianchi, Federico, Lönn, Gustaf, Ehn, Mikael, Lehtipalo, Katrianne, Dommen, Josef, Ehrhart, Sebastian, Ortega, Ismael K., Franchin, Alessandro, Nieminen, Tuomo, Riccobono, Francesco, Hutterli, Manuel, Duplissy, Jonathan, Almeida, João, Amorim, Antonio, Breitenlechner, Martin, Downard, Andrew J., Dunne, Eimear M., Flagan, Richard C., Kajos, Maija, Keskinen, Helmi, Kirkby, Jasper, Kupc, Agnieszka, Kürten, Andreas, Kurtén, Theo, Laaksonen, Ari, Mathot, Serge, Onnela, Antti, Praplan, Arnaud P., Rondo, Linda, Santos, Filipe D., Schallhart, Simon, Schnitzhofer, Ralf, Sipilä, Mikko, Tomé, António, Tsagkogeorgas, Georgios, Vehkamäki, Hanna, Wimmer, Daniela, Baltensperger, Urs, Carslaw, Kenneth S., Curtius, Joachim, Hansel, Armin, Petäjä, Tuukka, Kulmala, Markku, Donahue, Neil M., and Worsnop, Douglas R.
- Published
- 2013
39. Ion-induced nucleation of pure biogenic particles
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Kirkby, Jasper, Duplissy, Jonathan, Sengupta, Kamalika, Frege, Carla, Gordon, Hamish, Williamson, Christina, Heinritzi, Martin, Simon, Mario, Yan, Chao, Almeida, João, Tröstl, Jasmin, Nieminen, Tuomo, Ortega, Ismael K., Wagner, Robert, Adamov, Alexey, Amorim, Antonio, Bernhammer, Anne-Kathrin, Bianchi, Federico, Breitenlechner, Martin, Brilke, Sophia, Chen, Xuemeng, Craven, Jill, Dias, Antonio, Ehrhart, Sebastian, Flagan, Richard C., Franchin, Alessandro, Fuchs, Claudia, Guida, Roberto, Hakala, Jani, Hoyle, Christopher R., Jokinen, Tuija, Junninen, Heikki, Kangasluoma, Juha, Kim, Jaeseok, Krapf, Manuel, Kürten, Andreas, Laaksonen, Ari, Lehtipalo, Katrianne, Makhmutov, Vladimir, Mathot, Serge, Molteni, Ugo, Onnela, Antti, Peräkylä, Otso, Piel, Felix, Petäjä, Tuukka, Praplan, Arnaud P., Pringle, Kirsty, Rap, Alexandru, Richards, Nigel A. D., Riipinen, Ilona, Rissanen, Matti P., Rondo, Linda, Sarnela, Nina, Schobesberger, Siegfried, Scott, Catherine E., Seinfeld, John H., Sipilä, Mikko, Steiner, Gerhard, Stozhkov, Yuri, Stratmann, Frank, Tomé, Antonio, Virtanen, Annele, Vogel, Alexander L., Wagner, Andrea C., Wagner, Paul E., Weingartner, Ernest, Wimmer, Daniela, Winkler, Paul M., Ye, Penglin, Zhang, Xuan, Hansel, Armin, Dommen, Josef, Donahue, Neil M., Worsnop, Douglas R., Baltensperger, Urs, Kulmala, Markku, Carslaw, Kenneth S., and Curtius, Joachim
- Published
- 2016
- Full Text
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40. EASTERN PACIFIC EMITTED AEROSOL CLOUD EXPERIMENT
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Russell, Lynn M., Sorooshian, Armin, Seinfeld, John H., Albrecht, Bruce A., Nenes, Athanasios, Ahlm, Lars, Chen, Yi-Chun, Coggon, Matthew, Craven, Jill S., Flagan, Richard C., Frossard, Amanda A., Jonsson, Haflidi, Jung, Eunsil, Lin, Jack J., Metcalf, Andrew R., Modini, Robin, Mülmenstädt, Johannes, Roberts, Greg C., Shingler, Taylor, Song, Siwon, Wang, Zhen, and Wonaschütz, Anna
- Published
- 2013
41. SUPPLEMENT : EASTERN PACIFIC EMITTED AEROSOL CLOUD EXPERIMENT Tailor-Made Particles with a Battlefield Smoke Generator
- Author
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Russell, Lynn M., Sorooshian, Armin, Seinfeld, John H., Albrecht, Bruce A., Nenes, Athanasios, Ahlm, Lars, Chen, Yi-Chun, Coggon, Matthew, Craven, Jill S., Flagan, Richard C., Frossard, Amanda A., Jonsson, Haflidi, Jung, Eunsil, Lin, Jack J., Metcalf, Andrew R., Modini, Robin, Mülmenstädt, Johannes, Roberts, Greg C., Shingler, Taylor, Song, Siwon, Wang, Zhen, and Wonaschütz, Anna
- Published
- 2013
42. Survival of newly formed particles in haze conditions
- Author
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Marten, Ruby, primary, Xiao, Mao, additional, Rörup, Birte, additional, Wang, Mingyi, additional, Kong, Weimeng, additional, He, Xu-Cheng, additional, Stolzenburg, Dominik, additional, Pfeifer, Joschka, additional, Marie, Guillaume, additional, Wang, Dongyu S., additional, Scholz, Wiebke, additional, Baccarini, Andrea, additional, Lee, Chuan Ping, additional, Amorim, Antonio, additional, Baalbaki, Rima, additional, Bell, David M., additional, Bertozzi, Barbara, additional, Caudillo, Lucía, additional, Chu, Biwu, additional, Dada, Lubna, additional, Duplissy, Jonathan, additional, Finkenzeller, Henning, additional, Carracedo, Loïc Gonzalez, additional, Granzin, Manuel, additional, Hansel, Armin, additional, Heinritzi, Martin, additional, Hofbauer, Victoria, additional, Kemppainen, Deniz, additional, Kürten, Andreas, additional, Lampimäki, Markus, additional, Lehtipalo, Katrianne, additional, Makhmutov, Vladimir, additional, Manninen, Hanna E., additional, Mentler, Bernhard, additional, Petäjä, Tuukka, additional, Philippov, Maxim, additional, Shen, Jiali, additional, Simon, Mario, additional, Stozhkov, Yuri, additional, Tomé, António, additional, Wagner, Andrea C., additional, Wang, Yonghong, additional, Weber, Stefan K., additional, Wu, Yusheng, additional, Zauner-Wieczorek, Marcel, additional, Curtius, Joachim, additional, Kulmala, Markku, additional, Möhler, Ottmar, additional, Volkamer, Rainer, additional, Winkler, Paul M., additional, Worsnop, Douglas R., additional, Dommen, Josef, additional, Flagan, Richard C., additional, Kirkby, Jasper, additional, Donahue, Neil M., additional, Lamkaddam, Houssni, additional, Baltensperger, Urs, additional, and El Haddad, Imad, additional
- Published
- 2022
- Full Text
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43. High sensitivity nanoparticle detection using optical microcavities
- Author
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Lu, Tao, Lee, Hansuek, Chen, Tong, Herchak, Steven, Kim, Ji-Hun, Fraser, Scott E., Flagan, Richard C., Vahala, Kerry, and Yariv, Amnon
- Published
- 2011
- Full Text
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44. Nanoparticles and Nanostructures: Aerosol Synthesis and Characterization
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Flagan, Richard C., Chow, Gan-Moog, editor, and Noskova, Nina Ivanovna, editor
- Published
- 1998
- Full Text
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45. Reactive intermediates revealed in secondary organic aerosol formation from isoprene
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Surratt, Jason D., Chan, Arthur W. H., Eddingsaas, Nathan C., Chan, ManNin, Loza, Christine L., Kwan, Alan J., Hersey, Scott P., Flagan, Richard C., Wennberg, Paul O., Seinfeld, John H., and Finlayson-Pitts, Barbara J.
- Published
- 2010
46. Thermochemistry and Kinetics
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Flagan, Richard C. and Weimer, Alan W., editor
- Published
- 1997
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47. Label-Free, Single-Molecule Detection with Optical Microcavities
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Armani, Andrea M., Kulkarni, Rajan P., Fraser, Scott E., Flagan, Richard C., and Vahala, Kerry J.
- Published
- 2007
- Full Text
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48. Variability of the penetration of particles through facemasks
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Pushpawela, Buddhi, primary, Amanatidis, Stavros, additional, Huang, Yuanlong, additional, and Flagan, Richard C., additional
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- 2021
- Full Text
- View/download PDF
49. Chemical composition of nanoparticles from <i>α</i>-pinene nucleation and the influence of isoprene and relative humidity at low temperature
- Author
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Caudillo, Lucía, primary, Rörup, Birte, additional, Heinritzi, Martin, additional, Marie, Guillaume, additional, Simon, Mario, additional, Wagner, Andrea C., additional, Müller, Tatjana, additional, Granzin, Manuel, additional, Amorim, Antonio, additional, Ataei, Farnoush, additional, Baalbaki, Rima, additional, Bertozzi, Barbara, additional, Brasseur, Zoé, additional, Chiu, Randall, additional, Chu, Biwu, additional, Dada, Lubna, additional, Duplissy, Jonathan, additional, Finkenzeller, Henning, additional, Gonzalez Carracedo, Loïc, additional, He, Xu-Cheng, additional, Hofbauer, Victoria, additional, Kong, Weimeng, additional, Lamkaddam, Houssni, additional, Lee, Chuan P., additional, Lopez, Brandon, additional, Mahfouz, Naser G. A., additional, Makhmutov, Vladimir, additional, Manninen, Hanna E., additional, Marten, Ruby, additional, Massabò, Dario, additional, Mauldin, Roy L., additional, Mentler, Bernhard, additional, Molteni, Ugo, additional, Onnela, Antti, additional, Pfeifer, Joschka, additional, Philippov, Maxim, additional, Piedehierro, Ana A., additional, Schervish, Meredith, additional, Scholz, Wiebke, additional, Schulze, Benjamin, additional, Shen, Jiali, additional, Stolzenburg, Dominik, additional, Stozhkov, Yuri, additional, Surdu, Mihnea, additional, Tauber, Christian, additional, Tham, Yee Jun, additional, Tian, Ping, additional, Tomé, António, additional, Vogt, Steffen, additional, Wang, Mingyi, additional, Wang, Dongyu S., additional, Weber, Stefan K., additional, Welti, André, additional, Yonghong, Wang, additional, Yusheng, Wu, additional, Zauner-Wieczorek, Marcel, additional, Baltensperger, Urs, additional, El Haddad, Imad, additional, Flagan, Richard C., additional, Hansel, Armin, additional, Höhler, Kristina, additional, Kirkby, Jasper, additional, Kulmala, Markku, additional, Lehtipalo, Katrianne, additional, Möhler, Ottmar, additional, Saathoff, Harald, additional, Volkamer, Rainer, additional, Winkler, Paul M., additional, Donahue, Neil M., additional, Kürten, Andreas, additional, and Curtius, Joachim, additional
- Published
- 2021
- Full Text
- View/download PDF
50. A tool for uniform coating of 300-mm wafers with nanoparticles
- Author
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Holunga, Dean M., Brunelli, Nicholas A., and Flagan, Richard C.
- Published
- 2013
- Full Text
- View/download PDF
Catalog
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