CERN Accelerating science

CERN Document Server 15 записей найдено  1 - 10следующий  перейти к записи: Поиск длился 0.55 секунд. 
1.
Formation of Highly Oxygenated Organic Molecules from $\alpha$-Pinene Ozonolysis: Chemical Characteristics, Mechanism, and Kinetic Model Development / Molteni, Ugo (PSI, Villigen) ; Simon, Mario (Frankfurt U.) ; Heinritzi, Martin (Frankfurt U.) ; Hoyle, Christopher R (PSI, Villigen) ; Bernhammer, Anne-Kathrin (Ionicon GesmbH, Innsbruck) ; Bianchi, Federico (Helsinki U.) ; Breitenlechner, Martin (Innsbruck U.) ; Brilke, Sophia (Frankfurt U.) ; Dias, António (Lisbon U.) ; Duplissy, Jonathan (Helsinki U. ; Helsinki Inst. of Phys.) et al.
Terpenes are emitted by vegetation, and their oxidation in the atmosphere is an important source of secondary organic aerosol (SOA). A part of this oxidation can proceed through an autoxidation process, yielding highly oxygenated organic molecules (HOMs) with low saturation vapor pressure. [...]
2019 - 11 p. - Published in : ACS Earth and Space Chemistry 3 (2019) 873-883
2.
Temperature uniformity in the CERN CLOUD chamber / Dias, António (CERN) ; Ehrhart, Sebastian (CERN ; Mainz, Max Planck Inst.) ; Vogel, Alexander (CERN ; PSI, Villigen) ; Williamson, Christina (Goethe U., Frankfurt (main) ; Colorado U., CIRES) ; Almeida, João (CERN ; Goethe U., Frankfurt (main)) ; Kirkby, Jasper (CERN ; Goethe U., Frankfurt (main)) ; Mathot, Serge (CERN) ; Mumford, Samuel (CERN) ; Onnela, Antti (CERN)
The CLOUD (Cosmics Leaving OUtdoor Droplets) experiment at CERN (European Council for Nuclear Research) investigates the nucleation and growth of aerosol particles under atmospheric conditions and their activation into cloud droplets. A key feature of the CLOUD experiment is precise control of the experimental parameters. [...]
2017 - 14 p. - Published in : Atmos. Meas. Tech. 10 (2017) 5075-5088 Fulltext: PDF; External link: Fulltext
3.
Insight into Acid–Base Nucleation Experiments by Comparison of the Chemical Composition of Positive, Negative, and Neutral Clusters / Bianchi, Federico (PSI, Villigen) ; Praplan, Arnaud P (Helsinki U.) ; Sarnela, Nina (Helsinki U.) ; Dommen, Josef (PSI, Villigen) ; Kürten, Andreas (Goethe U., Frankfurt (main)) ; Ortega, Ismael K (Lille U.) ; Schobesberger, Siegfried (Helsinki U.) ; Junninen, Heikki (Helsinki U.) ; Simon, Mario (Goethe U., Frankfurt (main)) ; Tröstl, Jasmin (PSI, Villigen) et al.
We investigated the nucleation of sulfuric acid together with two bases (ammonia and dimethylamine), at the CLOUD chamber at CERN. The chemical composition of positive, negative, and neutral clusters was studied using three Atmospheric Pressure interface-Time Of Flight (APi-TOF) mass spectrometers: two were operated in positive and negative mode to detect the chamber ions, while the third was equipped with a nitrate ion chemical ionization source allowing detection of neutral clusters. [...]
2014 - 10 p. - Published in : Environ. Sci. Technol. 48 (2014) 13675-13684 Fulltext: PDF;
4.
Causes and importance of new particle formation in the present-day and preindustrial atmospheres / Gordon, Hamish (Leeds U.) ; Kirkby, Jasper (CERN ; Goethe U., Frankfurt (main)) ; Baltensperger, Urs (PSI, Villigen) ; Bianchi, Federico (Helsinki U.) ; Breitenlechner, Martin (Harvard U. (main)) ; Curtius, Joachim (Goethe U., Frankfurt (main)) ; Dias, Antonio (CERN) ; Dommen, Josef (PSI, Villigen) ; Donahue, Neil M (Carnegie Mellon U.) ; Dunne, Eimear M (Kuopio U.) et al.
New particle formation has been estimated to produce around half of cloud-forming particlesin the present-day atmosphere, via gas-to-particle conversion. Here we assess the importance of newparticle formation (NPF) for both the present-day and the preindustrial atmospheres [...]
2017 - 22 p. - Published in : J. Geophys. Res. 122 (2017) 8739-8760 Fulltext: PDF;
5.
Observation of viscosity transition in α-pinene secondary organic aerosol / Järvinen, Emma (KIT, Karlsruhe) ; Ignatius, Karoliina (TROPOS, Leibniz) ; Nichman, Leonid (Manchester U.) ; Kristensen, Thomas B (TROPOS, Leibniz) ; Fuchs, Claudia (PSI, Villigen) ; Hoyle, Christopher R (PSI, Villigen ; Davos Observ.) ; Höppel, Niko (KIT, Karlsruhe) ; Corbin, Joel C (PSI, Villigen) ; Craven, Jill (Caltech) ; Duplissy, Jonathan (Helsinki U.) et al.
Under certain conditions, secondary organic aerosol (SOA) particles can exist in the atmosphere in an amorphous solid or semi-solid state. To determine their relevance to processes such as ice nucleation or chemistry occurring within particles requires knowledge of the temperature and relative humidity (RH) range for SOA to exist in these states. [...]
2016 - 16 p. - Published in : Atmosph. Chem. Phys. 16 (2016) 4423-4438 Fulltext: PDF;
6.
Unexpectedly acidic nanoparticles formed in dimethylamine–ammonia–sulfuric-acid nucleation experiments at CLOUD / Lawler, Michael J (UC, Irvine (main)) ; Winkler, Paul M (Vienna U.) ; Kim, Jaeseok (UEF, Kuopio ; Korea Polar Research Institute, Republic of Korea) ; Ahlm, Lars (Stockholm U.) ; Tröstl, Jasmin (PSI, Villigen) ; Praplan, Arnaud P (Helsinki U. ; Finnish Meteorological Inst.) ; Schobesberger, Siegfried (Helsinki U. ; Washington U., Seattle) ; Kürten, Andreas (Goethe U., Frankfurt (main)) ; Kirkby, Jasper (Goethe U., Frankfurt (main) ; CERN) ; Bianchi, Federico (Helsinki U.) et al.
New particle formation driven by acid–base chemistry was initiated in the CLOUD chamber at CERN by introducing atmospherically relevant levels of gas-phase sulfuric acid and dimethylamine (DMA). Ammonia was also present in the chamber as a gas-phase contaminant from earlier experiments [...]
2016 - 18 p. - Published in : Atmosph. Chem. Phys. 16 (2016) 13601-13618 Fulltext: PDF;
7.
Phase transition observations and discrimination of small cloud particles by light polarization in expansion chamber experiments / Nichman, Leonid (Manchester U.) ; Fuchs, Claudia (PSI, Villigen) ; Järvinen, Emma (KIT, Karlsruhe) ; Ignatius, Karoliina (TROPOS, Leibniz) ; Höppel, Niko Florian (KIT, Karlsruhe) ; Dias, Antonio (CERN) ; Heinritzi, Martin (Goethe U., Frankfurt (main)) ; Simon, Mario (Goethe U., Frankfurt (main)) ; Tröstl, Jasmin (PSI, Villigen) ; Wagner, Andrea Christine (Goethe U., Frankfurt (main)) et al.
Cloud microphysical processes involving the ice phase in tropospheric clouds are among the major uncertainties in cloud formation, weather, and general circulation models. The detection of aerosol particles, liquid droplets, and ice crystals, especially in the small cloud particle-size range below 50 μm, remains challenging in mixed phase, often unstable environments. [...]
2016 - 14 p. - Published in : Atmosph. Chem. Phys. 16 (2016) 3651-3664 Fulltext: PDF;
8.
The effect of acid–base clustering and ions on the growth of atmospheric nano-particles / Lehtipalo, Katrianne (Helsinki U. ; PSI, Villigen) ; Rondo, Linda (Frankfurt U.) ; Kontkanen, Jenni (Helsinki U.) ; Schobesberger, Siegfried (Helsinki U. ; Washington U., Seattle) ; Jokinen, Tuija (Helsinki U.) ; Sarnela, Nina (Helsinki U.) ; Kürten, Andreas (Frankfurt U.) ; Ehrhart, Sebastian (Frankfurt U. ; CERN) ; Franchin, Alessandro (Helsinki U.) ; Nieminen, Tuomo (Helsinki U.) et al.
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. [...]
2016 - Published in : Nature Commun. 7 (2016) 11594 Fulltext: PDF;
9.
Experimental particle formation rates spanning tropospheric sulfuric acid and ammonia abundances, ion production rates, and temperatures / Kürten, Andreas ; Bianchi, Federico ; Almeida, Joao (CERN) ; Kupiainen-Määttä, Oona ; Dunne, Eimear M. ; Duplissy, Jonathan (CERN) ; Williamson, Christina ; Barmet, Peter ; Breitenlechner, Martin ; Dommen, Josef et al.
Binary nucleation of sulfuric acid and water as well as ternary nucleation involving ammonia arethought to be the dominant processes responsible for new particle formation (NPF) in the cold temperaturesof the middle and upper troposphere. Ions are also thought to be important for particle nucleation inthese regions. [...]
2016 - 24 p. - Published in : J. Geophys. Res. Atmos. 121 (2016) 12,377-12,400
10.
Reduced anthropogenic aerosol radiative forcing caused by biogenic new particle formation / Gordon, Hamish (CERN) ; Sengupta, Kamalika (U. Leeds (main)) ; Rap, Alexandru (U. Leeds (main)) ; Duplissy, Jonathan (Helsinki Inst. of Phys.) ; Frege, Carla (PSI, Villigen) ; Williamson, Christina (Goethe U., Frankfurt (main) ; Colorado U., CIRES ; NCAR, Boulder) ; Heinritzi, Martin (Goethe U., Frankfurt (main)) ; Simon, Mario (Goethe U., Frankfurt (main)) ; Yan, Chao (Helsinki U.) ; Almeida, João (CERN ; Goethe U., Frankfurt (main)) et al.
2016 - Published in : Proc. Natl. Acad. Sci. U. S. A. 113 (2016) 12053-12058

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