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Plasma channel formation in NIR laser-irradiated carrier gas from an aerosol nanoparticle injector
ELI Beamlines, Inst Phys AS CR, Vvi, Na Slovance 2, Prague 18221 8, Czech Republic.
ELI Beamlines, Inst Phys AS CR, Vvi, Na Slovance 2, Prague 18221 8, Czech Republic.
ELI Beamlines, Inst Phys AS CR, Vvi, Na Slovance 2, Prague 18221 8, Czech Republic.
ELI Beamlines, Inst Phys AS CR, Vvi, Na Slovance 2, Prague 18221 8, Czech Republic;Tech Univ Berlin, Inst Opt & Atomare Phys, ER 1-1,Str 17 Juni 135, D-10623 Berlin, Germany.
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2019 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 9, article id 8851Article in journal (Refereed) Published
Abstract [en]

Aerosol nanoparticle injectors are fundamentally important for experiments where container-free sample handling is needed to study isolated nanoparticles. The injector consists of a nebuliser, a differential pumping unit, and an aerodynamic lens to create and deliver a focused particle beam to the interaction point inside a vacuum chamber. The tightest focus of the particle beam is close to the injector tip. The density of the focusing carrier gas is high at this point. We show here how this gas interacts with a near infrared laser pulse (800 nm wavelength, 120 fs pulse duration) at intensities approaching 10(16) Wcm(-2). We observe acceleration of gas ions to kinetic energies of 100s eV and study their energies as a function of the carrier gas density. Our results indicate that field ionisation by the intense near-infrared laser pulse opens up a plasma channel behind the laser pulse. The observations can be understood in terms of a Coulomb explosion of the created underdense plasma channel. The results can be used to estimate gas background in experiments with the injector and they open up opportunities for a new class of studies on electron and ion dynamics in nanoparticles surrounded by a low-density gas.

Place, publisher, year, edition, pages
NATURE PUBLISHING GROUP , 2019. Vol. 9, article id 8851
National Category
Atom and Molecular Physics and Optics
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URN: urn:nbn:se:uu:diva-390094DOI: 10.1038/s41598-019-45120-3ISI: 000472136900025PubMedID: 31221980OAI: oai:DiVA.org:uu-390094DiVA, id: diva2:1340343
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Swedish Research CouncilKnut and Alice Wallenberg FoundationAvailable from: 2019-08-05 Created: 2019-08-05 Last updated: 2019-08-05Bibliographically approved

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