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Measurement of the collision rate coefficients between atmospheric ions and multiply charged aerosol particles in the CERN CLOUD chamber
/ Pfeifer, Joschka (CERN ; Frankfurt U.) ; Mahfouz, Naser G A (Carnegie Mellon U. ; Princeton U.) ; Schulze, Benjamin C (Caltech) ; Mathot, Serge (CERN) ; Stolzenburg, Dominik (Helsinki U.) ; Baalbaki, Rima (Helsinki U.) ; Brasseur, Zoé (Helsinki U.) ; Caudillo, Lucia (Frankfurt U., FIAS ; Frankfurt U.) ; Dada, Lubna (PSI, Villigen) ; Granzin, Manuel (Frankfurt U., FIAS ; Frankfurt U.) et al.
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. [...]
2023 - 16 p.
- Published in : Atmos. Chem. Phys. 23 (2023) 6703-6718
Fulltext: PDF;
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RF Measurements and Tuning of the CERN 750 MHz ELISA-RFQ for Public Exhibition
/ Marchi, Mariangela (CERN ; U. Rome La Sapienza (main)) ; Grudiev, Alexej (CERN) ; Mathot, Serge (CERN) ; Pommerenke, Hermann (CERN)
Over the last few years, CERN has successfully designed, built, and commissioned the smallest RFQ to date, the one meter long PIXE-RFQ operating at 750 MHz. Its compactness offers a unique opportunity for education and public presentation of the accelerator community: A duplicate ma- chine called ELISA-RFQ (Experimental Linac for Surface Analysis) will be exhibited in the Science Gateway, CERN’s upcoming scientific education and outreach center. [...]
2022 - 4 p.
- Published in : JACoW LINAC 2022 (2022) 426-429
Fulltext: PDF;
In : 31st Linear Accelerator Conference (LINAC22), Liverpool, UK, 28 Aug - 2 Sep 2022, pp.426-429
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Synergistic HNO$_{3}$–H$_{2}$SO$_{4}$–NH$_{3}$ upper tropospheric particle formation
/ Wang, Mingyi ; Xiao, Mao ; Bertozzi, Barbara ; Marie, Guillaume ; Rörup, Birte ; Schulze, Benjamin ; Bardakov, Roman ; He, Xu-Cheng ; Shen, Jiali ; Scholz, Wiebke et al.
New particle formation in the upper free troposphere is a major global source of cloud condensation nuclei (CCN). However, the precursor vapours that drive the process are not well understood. [...]
2022 - 7 p.
- Published in : Nature 605 (2022) 483-489
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The driving factors of new particle formation and growth in the polluted boundary layer
/ Xiao, Mao ; Hoyle, Christopher R ; Dada, Lubna ; Stolzenburg, Dominik ; Kürten, Andreas ; Wang, Mingyi ; Lamkaddam, Houssni ; Garmash, Olga ; Mentler, Bernhard ; Molteni, Ugo et al.
New particle formation (NPF) is a significant
source of atmospheric particles, affecting climate and air
quality. Understanding the mechanisms involved in urban
aerosols is important to develop effective mitigation strategies. [...]
2021 - 17 p.
- Published in : Atmos. Chem. Phys. 21 (2021) 14275-14291
Fulltext: PDF; Supplement: PDF;
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Molecular understanding of the suppression of new-particle formation by isoprene
/ Heinritzi, Martin (Frankfurt U.) ; Dada, Lubna (Helsinki U.) ; Simon, Mario (Frankfurt U.) ; Stolzenburg, Dominik (Vienna U.) ; Wagner, Andrea C (Frankfurt U. ; U. Colorado, Boulder) ; Fischer, Lukas (Innsbruck U.) ; Ahonen, Lauri R (Helsinki U.) ; Amanatidis, Stavros (Caltech, Pasadena (main)) ; Baalbaki, Rima (Helsinki U.) ; Baccarini, Andrea (PSI, Villigen) et al.
Nucleation of atmospheric vapours produces more
than half of global cloud condensation nuclei and so has
an important influence on climate. Recent studies show
that monoterpene (C$_{10}$H$_{16}$) oxidation yields highly oxygenated products that can nucleate with or without sulfuric acid. [...]
2020 - 13 p.
- Published in : Atmos. Chem. Phys. 20 (2020) 11809-11821
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6.
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Role of iodine oxoacids in atmospheric aerosol nucleation
/ He, Xu-Cheng (Helsinki U.) ; Tham, Yee Jun (Helsinki U.) ; Dada, Lubna (Helsinki U.) ; Wang, Mingyi (Carnegie Mellon U.) ; Finkenzeller, Henning (U. Colorado, Boulder) ; Stolzenburg, Dominik (Vienna U. ; Helsinki U.) ; Iyer, Siddharth (Tampere U. of Tech.) ; Simon, Mario (Frankfurt U., FIAS) ; Kürten, Andreas (Frankfurt U., FIAS) ; Shen, Jiali (Helsinki U.) et al.
Iodic acid (HIO3) is known to form aerosol particles in coastal marine regions, but predicted nucleation and growth rates are lacking. Using the CERN CLOUD (Cosmics Leaving Outdoor Droplets) chamber, we find that the nucleation rates of HIO3 particles are rapid, even exceeding sulfuric acid–ammonia rates under similar conditions. [...]
2021 - 7 p.
- Published in : Science 371 (2021) 589-595
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7.
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Data Acquisition System of the CLOUD Experiment at CERN
/ Weber, Stefan K (CERN) ; Miotto, Giovanna Lehmann (CERN) ; Almeida, João (CERN) ; Blanc, Pascal Herve (CERN) ; Dias, António (Lisbon, CENTRA ; Lisbon U.) ; Malaguti, Giulio (CERN) ; Manninen, Hanna E (CERN) ; Pfeifer, Joschka (CERN) ; Ravat, Sylvain (CERN) ; Onnela, Antti (CERN) et al.
The Cosmics Leaving OUtdoor Droplets (CLOUD) experiment at the European Organization for Nuclear Research (CERN) is investigating the nucleation and growth of aerosol particles under atmospheric conditions and their activation into cloud droplets. The experiment comprises an ultraclean 26 m3chamber and its associated systems (the CLOUD facility) together with a suite of around 50 advanced instruments attached to the chamber via sampling probes to analyze its contents. [...]
2021 - 13 p.
- Published in : IEEE Trans. Instrum. Meas. 70 (2021) 1-13
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Rapid growth of new atmospheric particles by nitric acid and ammonia condensation
/ Wang, Mingyi (Carnegie Mellon U.) ; Kong, Weimeng (Caltech) ; Marten, Ruby (PSI, Villigen) ; He, Xu-Cheng (Helsinki U.) ; Chen, Dexian (Carnegie Mellon U.) ; Pfeifer, Joschka (CERN) ; Heitto, Arto (Kuopio U.) ; Kontkanen, Jenni (Helsinki U.) ; Dada, Lubna (Helsinki U.) ; Kürten, Andreas (Goethe U., Frankfurt (main)) et al.
Measurements in the CLOUD chamber at CERN show that the rapid condensation of ammonia and nitric acid vapours could be important for the formation and survival of new particles in wintertime urban conditions, contributing to urban smog..
2020 - 20 p.
- Published in : Nature 581 (2020) 184-189
Fulltext from Publisher: PDF;
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9.
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rf design studies on the 750 MHz radio frequency quadrupole linac for proton-induced x-ray emission analysis
/ Pommerenke, Hermann Winrich (CERN ; U. Rostock) ; Bencini, Vittorio (CERN) ; Grudiev, Alexej (CERN) ; Lombardi, Alessandra Maria (CERN) ; Mathot, Serge (CERN) ; Montesinos, Eric (CERN) ; Timmins, Marc (CERN) ; van Rienen, Ursula (U. Rostock) ; Vretenar, Maurizio (CERN)
The proton-induced x-ray emission (PIXE) is the most commonly used ion beam analysis technique. It allows for nondestructive quantitative elemental characterization and is used in a variety of fields, particularly for the diagnosis of cultural heritage artwork. [...]
2019 - 12 p.
- Published in : Phys. Rev. Accel. Beams 22 (2019) 052003
Fulltext from Publisher: PDF;
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10.
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Rapid growth of organic aerosol nanoparticles over a wide tropospheric temperature range
/ Stolzenburg, Dominik (Vienna U.) ; Fischer, Lukas (Innsbruck U.) ; Vogel, Alexander L (Frankfurt U. ; CERN ; PSI, Villigen) ; Heinritzi, Martin (Frankfurt U.) ; Schervish, Meredith (Carnegie Mellon U.) ; Simon, Mario (Frankfurt U.) ; Wagner, Andrea C (Frankfurt U.) ; Dada, Lubna (Helsinki U.) ; Ahonen, Lauri R (Helsinki U.) ; Amorim, Antonio (Lisbon U. ; CMAF, Lisbon) et al.
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 <10 nm, where coagulation losses to larger aerosol particles are greatest. [...]
2018 - 6 p.
- Published in : Proc. Natl. Acad. Sci. U. S. A. 115 (2018) 9122-9127
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