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1.
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On the composition of ammonia–sulfuric-acid ion clusters during aerosol particle formation
/ Schobesberger, S (Helsinki U.) ; Franchin, A (Helsinki U.) ; Bianchi, F (PSI, Villigen) ; Rondo, L (Goethe U., Frankfurt (main)) ; Duplissy, J (Helsinki U. ; CERN) ; Kürten, A (Goethe U., Frankfurt (main)) ; Ortega, I K (Helsinki U. ; PhLAM, Villeneuve d'Ascq) ; Metzger, A (Ionicon Analytik GmbH, Innsbruck) ; Schnitzhofer, R (Innsbruck U.) ; Almeida, J (CERN) et al.
The formation of particles from precursor vapors is an important source of atmospheric aerosol. Research at the Cosmics Leaving OUtdoor Droplets (CLOUD) facility at CERN tries to elucidate which vapors are responsible for this new-particle formation, and how in detail it proceeds. [...]
2015 - 24 p.
- Published in : Atmos. Chem. Phys. 15 (2015) 55-78
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2.
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Experimental investigation of ion–ion recombination under atmospheric conditions
/ Franchin, A (Helsinki U.) ; Ehrhart, S (CERN ; Goethe U., Frankfurt (main)) ; Leppä, J (Finnish Meteorological Inst. ; Caltech, Eng. Appl. Sci.) ; Nieminen, T (Helsinki U.) ; Gagné, S (Dalhousie U. ; York U., Canada) ; Schobesberger, S (Helsinki U.) ; Wimmer, D (Helsinki U.) ; Duplissy, J (Helsinki U.) ; Riccobono, F (PSI, Villigen) ; Dunne, E M (Finnish Meteorological Inst.) et al.
We present the results of laboratory measurements of the ion–ion recombination coefficient at different temperatures, relative humidities and concentrations of ozone and sulfur dioxide. The experiments were carried out using the Cosmics Leaving OUtdoor Droplets (CLOUD) chamber at CERN, the walls of which are made of conductive material, making it possible to measure small ions. [...]
2015 - 14 p.
- Published in : Atmosph. Chem. Phys. 15 (2015) 7203-7216
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3.
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Performance of diethylene glycol-based particle counters in the sub-3 nm size range
/ Wimmer, D (Goethe U., Frankfurt (main)) ; Lehtipalo, K (Helsinki U. ; Airmodus, Helsinki) ; Franchin, A (Helsinki U.) ; Kangasluoma, J (Helsinki U.) ; Kreissl, F (Goethe U., Frankfurt (main)) ; Kürten, A (Goethe U., Frankfurt (main)) ; Kupc, A (U. Vienna (main)) ; Metzger, A (Goethe U., Frankfurt (main)) ; Mikkilä, J (Airmodus, Helsinki) ; Petäjä, J (Helsinki U.) et al.
When studying new particle formation, the uncertainty in determining the "true" nucleation rate is considerably reduced when using condensation particle counters (CPCs) capable of measuring concentrations of aerosol particles at sizes close to or even at the critical cluster size (1–2 nm). Recently, CPCs able to reliably detect particles below 2 nm in size and even close to 1 nm became available. [...]
2013
- Published in : Atmos. Meas. Tech. 6 (2013) 1793-1804
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4.
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Characterisation of organic contaminants in the CLOUD chamber at CERN
/ Schnitzhofer, R (Innsbruck U.) ; Metzger, A (Ionicon Anaalytik, Innsbruck) ; Breitenlechner, M (Innsbruck U.) ; Jud, W (Innsbruck U.) ; Heinritzi, M (Innsbruck U.) ; Menezes, L-P (CERN) ; Duplissy, J (CERN ; Helsinki U.) ; Guida, R (CERN) ; Haider, S (CERN) ; Kikby, J (CERN) et al.
The CLOUD experiment (Cosmics Leaving OUtdoor Droplets) investigates the nucleation of new particles and how this process is influenced by galactic cosmic rays in an electropolished, stainless-steel environmental chamber at CERN (European Organization for Nuclear Research). Since volatile organic compounds (VOCs) can act as precursor gases for nucleation and growth of particles, great efforts have been made to keep their unwanted background levels as low as possible and to quantify them. [...]
2014
- Published in : Atmos. Meas. Tech. 7 (2014) 2159-2168
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5.
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Relating hygroscopicity and composition of organic aerosol particulate matter
/ Duplissy, J (PSI, Villigen) ; Dommen, J (PSI, Villigen) ; Prevot, A S H (PSI, Villigen) ; Barmpadimos, I (PSI, Villigen) ; Jimenez, J L (Colorado U. ; Colorado U., CIRES) ; Gysel, M (PSI, Villigen) ; Worsnop, D R (Aerodyne Research, Billerica ; Helsinki U.) ; Aiken, A C (Colorado U. ; Colorado U., CIRES) ; Tritscher, T (PSI, Villigen) ; Canagaratna, M R (Aerodyne Research, Billerica) et al.
A hygroscopicity tandem differential mobility analyzer (HTDMA) was used to measure the water uptake (hygroscopicity) of secondary organic aerosol (SOA) formed during the chemical and photochemical oxidation of several organic precursors in a smog chamber. Electron ionization mass spectra of the non-refractory submicron aerosol were simultaneously determined with an aerosol mass spectrometer (AMS), and correlations between the two different signals were investigated. [...]
2011
- Published in : Atmos. Chem. Phys. 11 (2011) 1155-1165
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6.
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Role of sulphuric acid, ammonia and galactic cosmic rays in atmospheric aerosol nucleation
/ Kirkby, Jasper (CERN) ; Curtius, Joachim (Goethe U., Frankfurt) ; Almeida, João (Goethe U., Frankfurt ; SIM, Lisbon U. ; Beira Interior U., Lisbon) ; Dunne, Eimear (Leeds U.) ; Duplissy, Jonathan (CERN ; Helsinki U. ; Helsinki Inst. of Phys.) ; Ehrhart, Sebastian (Goethe U., Frankfurt) ; Franchin, Alessandro (Helsinki U.) ; Gagné, Stéphanie (Helsinki U. ; Helsinki Inst. of Phys.) ; Ickes, Luisa (Goethe U., Frankfurt) ; Kürten, Andreas (Goethe U., Frankfurt) et al.
Atmospheric aerosols exert an important influence on climate1 through their effects on stratiform cloud albedo and lifetime2 and the invigoration of convective storms3. Model calculations suggest that almost half of the global cloud condensation nuclei in the atmospheric boundary layer may originate from the nucleation of aerosols from trace condensable vapours4, although the sensitivity of the number of cloud condensation nuclei to changes of nucleation rate may be small5, 6. [...]
2011
- Published in : Nature 476 (2011) 429-433
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7.
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8.
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9.
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Measurement of spin-transfer observables in pp to $\Lambda \Lambda$ at 1.637 GeV/c
/ PS185 Collaboration
Spin-transfer observables for pp to Lambda Lambda have been measured using a transversely polarized frozen-spin target and a beam momentum of 1.637 GeV/c. Current models of the reaction near threshold are in good agreement with existing measurements performed with unpolarized particles in the initial state but produce conflicting predictions for the spin-transfer observables D/sub nn/ and K/sub nn/ (the normal-to-normal depolarization and polarization transfer), which are measurable only with polarized target or beam. [...]
nucl-ex/0206005.-
2002 - 5 p.
- Published in : Phys. Rev. Lett. 89 (2002) 212302
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