Cooperative effect of ultraviolet and near-infrared beams in laser-induced condensation

Matthews, Mary; Henin, Stefano; Pomel, François Sylvain; Théberge, F.; Lassonde, P.; Daigle, J.-F.; Kieffer, J.-C.; Kasparian, Jérôme; Wolf, Jean-Pierre

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Title		Cooperative effect of ultraviolet and near-infrared beams in laser-induced condensation
Authors		Matthews, Mary Henin, Stefano Pomel, François Sylvain Théberge, F. Lassonde, P. Daigle, J.-F. Kieffer, J.-C. Kasparian, Jérôme Wolf, Jean-Pierre show all authors [1 - 9]
Published in		Applied Physics Letters. 2014, vol. 103, no. 26, p. 264103
Abstract		We demonstrate the cooperative effect of near infrared (NIR) and ultraviolet (UV) beams on laser-induced condensation. Launching a UV laser after a NIR pulse yields up to a 5-fold increase in the production of nanoparticles (25–300 nm) as compared to a single NIR beam. This cooperative effect exceeds the sum of those from the individual beams and occurs for delays up to 1 μs. We attribute it to the UV photolysis of ozone created by the NIR pulses. The resulting OH radicals oxidize NO2 and volatile organic compounds, producing condensable species.
Keywords		Ozone — Ultraviolet light — Nanoparticles — Condensation — Photodissociation
Identifiers		DOI: 10.1063/1.4857895
Full text		Article (Published version) (854 Kb) - Free access Other version: http://scitation.aip.org/content/aip/journal/apl/103/26/10.1063/1.4857895
Structures		Centres et instituts / Institut des sciences de l'environnement Faculté des sciences / Section de physique / Groupe de physique appliquée
Research groups		ISE Pôle Sciences ISE Climat
Citation (ISO format)		MATTHEWS, Mary et al. Cooperative effect of ultraviolet and near-infrared beams in laser-induced condensation. In: Applied Physics Letters, 2014, vol. 103, n° 26, p. 264103. https://archive-ouverte.unige.ch/unige:37064