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Luminous phase of nanosecond discharge in deionized water: morphology, propagation velocity and optical emission.

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    SYSNO ASEP0476024
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitleLuminous phase of nanosecond discharge in deionized water: morphology, propagation velocity and optical emission.
    Author(s) Šimek, Milan (UFP-V) RID, ORCID
    Pongrác, Branislav (UFP-V)
    Babický, Václav (UFP-V) RID
    Člupek, Martin (UFP-V) RID
    Lukeš, Petr (UFP-V) RID, ORCID
    Article number07LT01
    Source TitlePlasma Sources Science & Technology. - : Institute of Physics Publishing - ISSN 0963-0252
    Roč. 26, č. 7 (2017)
    Number of pages9 s.
    Publication formPrint - P
    Languageeng - English
    CountryGB - United Kingdom
    Keywordswater ; nanosecond discharge ; emission spectra ; breakdown
    Subject RIVBL - Plasma and Gas Discharge Physics
    OECD categoryFluids and plasma physics (including surface physics)
    R&D ProjectsGA15-12987S GA ČR - Czech Science Foundation (CSF)
    Institutional supportUFP-V - RVO:61389021
    UT WOS000404471700001
    EID SCOPUS85021748964
    DOI10.1088/1361-6595/aa758d
    AnnotationWe employed the techniques of time-resolved intensified charge-coupled device (ICCD) microscopy and spectroscopy to register basic morphologic and emission fingerprints of micro-discharges produced in deionized water. Time resolved ICCD images evidence typical streamer-like branched filamentary morphology. Luminous discharge filaments show very fast and approximately linear initial expansion of the length with propagation velocity of ~2 × 105 m s-1. When the HV pulse reaches its maximum value, the length of the primary luminous filaments reaches ~1.3 mm. The UV-vis-NIR emission spectra show a broad-band continuum evolving during the first expansion and collapse, followed by the well-known HI/OI atomic lines occurring together with continuum emission during the second expansion and collapse. We conclude that bound-free and free-free radiative transitions are basic emission characteristics of the discharge initiation mechanism, which does not involve the formation of vapour bubbles.
    WorkplaceInstitute of Plasma Physics
    ContactVladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975
    Year of Publishing2018
Number of the records: 1  

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