Laser induced aerosol formation mediated by resonant excitation of volatile organic compounds

Autor(en)

V. Shumakova, E. Schubert, T. Balciunas, M. Matthews, S. Alisauskas, D. Mongin, A. Pugzlys, J. Kasparian, A. Baltuska, J.-P. Wolf

Abstrakt

Since its first demonstration, laser induced aerosol formation (LIAF) has been studied in various environmental conditions and laser parameters. LIAF driven by UV and near-IR lasers mainly relies on the nitrogen photo-oxidative chemistry, leading to the production of hygroscopic HNO3, which stabilizes the growth of aerosol nanoparticles. Mid-IR lasers were expected to be drastically less effective for LIAF, due to their much lower multiphoton photodissociation and ionization rates. Here, we report on the observation of surprisingly high yields of nanometric and sub-mu m aerosol formation driven by mid-IR laser pulses, which cannot be explained by the HNO3-pathway. We hereby evidence a new mechanism of aerosol stabilization and growth, based on the resonant excitation of volatile organic compounds (VOCs) by mid-IR pulses whose spectrumis broadened during filamentation. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License.

Organisation(en)

Fakultätszentrum für Nanostrukturforschung

Externe Organisation(en)

Center for Physical Sciences and Technology, Université de Genève, Technische Universität Wien

Journal

Optica

Band

8

Seiten

1256-1261

Anzahl der Seiten

6

ISSN

2334-2536

DOI

https://doi.org/10.1364/OPTICA.434659

Publikationsdatum

10-2021

Peer-reviewed

Ja

ÖFOS 2012

103021 Optik

Schlagwörter

Link zum Portal

https://ucris.univie.ac.at/portal/de/publications/laser-induced-aerosol-formation-mediated-by-resonant-excitation-of-volatile-organic-compounds(4cb1e566-07c5-484d-b3e8-d6ea3235f7a2).html