Temporally and spatially resolved continuum radiation between 600 and 1000 nm from nanosecond discharge in water: implications for understanding the initiation mystery

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F25%3A00644817" target="_blank" >RIV/61389021:_____/25:00644817 - isvavai.cz</a>

Result on the web

<a href="https://iopscience.iop.org/article/10.1088/1361-6595/adf007" target="_blank" >https://iopscience.iop.org/article/10.1088/1361-6595/adf007</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1361-6595/adf007" target="_blank" >10.1088/1361-6595/adf007</a>

Result language

angličtina

Original language name

Temporally and spatially resolved continuum radiation between 600 and 1000 nm from nanosecond discharge in water: implications for understanding the initiation mystery

Original language description

Emission spectra of a nanosecond discharge initiated in liquid water provide an important tool for investigating the driving mechanisms and fundamental properties of in-liquid plasmas. In this work, we report for the first time on optical emission characteristics of the expanding discharge in deionized water resolved both in space and time in the near-infrared spectral range up to 1050 nm. We systematically examined ICCD images with associated emission spectra at fixed discharge conditions. The images reveal the morphology and dynamics of expanding discharge, while ICCD spectra obtained as a function of distance from the anode apex prove the initial emission characteristics based on structureless continua originating from bulk water without any distinguishable contribution coming from the tungsten anode surface. Furthermore, based on the comparison of 2D maps of emission spectra with images registered using a four-channel ICCD imager, we managed to connect the morphology of the luminous discharge phase with the specific characteristics of the plasma-induced emission in the vis-NIR region. We reveal that the initial diffuse morphology is associated with weak broadband emission continua, while the subsequent filamentary morphology shows much more intense spectra on time scales of tens of nanoseconds, consisting of significantly broadened H<inf>α</inf> and several O^I atomic lines superimposed on the broadband continuum. Preliminary analysis of line profiles yields corresponding electron densities between 10¹⁸ and 10²⁰ cm⁻³. All these findings provide important insight for understanding the mechanisms of direct nanosecond high-voltage discharge in liquid water.

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

—

OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

<a href="/en/project/GA24-10903S" target="_blank" >GA24-10903S: Research on the formation of nanocavities with the subsequent formation and multiplication of electrons in water using laser-based diagnostics.</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

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

Name of the periodical

Plasma Sources Science & Technology

ISSN

0963-0252

e-ISSN

1361-6595

Volume of the periodical

34

Issue of the periodical within the volume

7

Country of publishing house

US - UNITED STATES

Number of pages

23

Pages from-to

075014

UT code for WoS article

001541132000001

EID of the result in the Scopus database

2-s2.0-105011948899