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Laser filament-induced aerosol formation

Saathoff, H.
Stelmaszczyk, K.
Delagrange, R.
Hao, Z.
Möhler, O.
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Published in Atmospheric chemistry and physics. 2012, vol. 12, no. 11, p. 29851-29885
Abstract Using the aerosol and cloud simulation chamber AIDA we investigated the laser filament induced particle formation in ambient air, humid synthetic air, humid nitrogen, argon-oxygen mixture, and pure argon in order to simulate the particle formation under realistic atmospheric conditions as well as to investigate the influence of typical gas-phase atmospheric constituents on the particle formation. Terawatt laser plasma filaments generated new particles in the size range 3 to 130 nm with particle production rates ranging from 1 × 107 to 5 × 109 cm−3 plasma s−1. In all cases the particle formation rates increased exponentially with the water content of the gas mixture. Furthermore, the presence of a few ppb of trace gases like SO2 and α-pinene clearly enhanced the particle yield by number, the latter also by mass. Our findings suggest that new particle formation is efficiently supported by acids generated by the photo-ionization of both major and minor components of the air, including N2, NH3, SO2 and organics
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Research groups ISE Climat
ISE Pôle Sciences
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SAATHOFF, H. et al. Laser filament-induced aerosol formation. In: Atmospheric chemistry and physics, 2012, vol. 12, n° 11, p. 29851-29885. doi: 10.5194/acpd-12-29851-2012 https://archive-ouverte.unige.ch/unige:37087

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Deposited on : 2014-06-03

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