Spectroscopic characteristics of H-alpha/O-I atomic lines generated by nanosecond pulsed corona-like discharge in deionized water

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F18%3A00489522" target="_blank" >RIV/61389021:_____/18:00489522 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1088/1361-6463/aaabb1" target="_blank" >http://dx.doi.org/10.1088/1361-6463/aaabb1</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1361-6463/aaabb1" target="_blank" >10.1088/1361-6463/aaabb1</a>

Result language

angličtina

Original language name

Spectroscopic characteristics of H-alpha/O-I atomic lines generated by nanosecond pulsed corona-like discharge in deionized water

Original language description

Basic emission fingerprints of nanosecond discharges produced in deionized water by fast rise-time positive high-voltage pulses (duration of 6 ns and amplitude of + 100 kV) in a point-to-plane electrode geometry were investigated by means of time-resolved intensified charge-coupled device (ICCD) spectroscopy. Time-resolved emission spectra were measured via ICCD kinetic series during the discharge ignition and later phases over the 350-850 nm spectral range with fixed, either 3 ns or 30 ns, acquisition time and with 3 ns or 30 ns time resolution, respectively. The luminous phase of the initial discharge expansion and its subsequent collapse was characterized by a broadband vis-NIR continuum emission evolving during the first few nanoseconds which shifted more toward the UV with further increase of time. After similar to 30 ns from the discharge onset, the continuum gradually disappeared followed by the emission of H-alpha and O-I atomic lines. The electron densities calculated from the H-alpha profile fit were estimated to be of the order of 10(18)-10(19) cm(-3). It is unknown if the H-alpha and O-I atomic lines are generated even in earlier times (before similar to 30 ns) because such signals were not detectable due to the superposition with the strong continuum. However, subsequent events caused by the reflected HV pulses were observed to have significant effects on the emission spectra profiles of the nanosecond discharge. By varying the time delay of the reflected pulse from 45 to 90 ns after the primary pulse, the intensities of the H-alpha/O-I atomic lines in the emission spectra of the secondary discharges were clearly visible and their intensities were greater with shorter time delay between primary and reflected pulses. These results indicate that the discharges generated due to the reflected pulses were very likely generated in the non-relaxed environment.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

<a href="/en/project/GA15-12987S" target="_blank" >GA15-12987S: Plasma-liquid interactions in organic solutions induced by high-voltage electrical discharges</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Physics D-Applied Physics

ISSN

0022-3727

e-ISSN

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Volume of the periodical

51

Issue of the periodical within the volume

12

Country of publishing house

GB - UNITED KINGDOM

Number of pages

10

Pages from-to

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UT code for WoS article

000425962700001

EID of the result in the Scopus database

2-s2.0-85043456411