Equilibrium in Low Temperature H3+-dominated Plasma, Application of Cavity Ring-Down Spectroscopy

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F12%3A10132621" target="_blank" >RIV/00216208:11320/12:10132621 - isvavai.cz</a>

Výsledek na webu

<a href="http://auc.karlin.mff.cuni.cz" target="_blank" >http://auc.karlin.mff.cuni.cz</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Equilibrium in Low Temperature H3+-dominated Plasma, Application of Cavity Ring-Down Spectroscopy

Popis výsledku v původním jazyce

We examine establishing of a thermal equilibrium in a H3+-dominated plasma (produced by a microwave discharge ignited in He-Ar-H2 gas mixture) and in its afterglow at temperatures 77-220 K by Cavity Ring-Down Spectroscopy. With respect to the observed population of lowest rotational states of the ground vibrational state of H3+ ion, we conclude that the rotational temperature is well defined and stable. It is equal to the He buffer gas temperature and to the kinetic temperature of the ions. By using para-enriched H2 gas, we achieve high population of para nuclear spin states of H3+ ions in the discharge. This population is not constant in time and evolves towards a steady state (asymptotic) value which is not equal to the thermodynamic equilibrium value for a given temperature. The fact that the value of the steady state para-H3+ fraction does not vary with the concentration of para-enriched H2 indicates that degradation of para-enrichment of H2 in the discharge is negligible.

Název v anglickém jazyce

Equilibrium in Low Temperature H3+-dominated Plasma, Application of Cavity Ring-Down Spectroscopy

Popis výsledku anglicky

We examine establishing of a thermal equilibrium in a H3+-dominated plasma (produced by a microwave discharge ignited in He-Ar-H2 gas mixture) and in its afterglow at temperatures 77-220 K by Cavity Ring-Down Spectroscopy. With respect to the observed population of lowest rotational states of the ground vibrational state of H3+ ion, we conclude that the rotational temperature is well defined and stable. It is equal to the He buffer gas temperature and to the kinetic temperature of the ions. By using para-enriched H2 gas, we achieve high population of para nuclear spin states of H3+ ions in the discharge. This population is not constant in time and evolves towards a steady state (asymptotic) value which is not equal to the thermodynamic equilibrium value for a given temperature. The fact that the value of the steady state para-H3+ fraction does not vary with the concentration of para-enriched H2 indicates that degradation of para-enrichment of H2 in the discharge is negligible.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BL - Fyzika plasmatu a výboje v plynech

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2012

Kód důvěrnosti údajů

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

Název periodika

Acta Universitatis Carolinae - Mathematica et Physica

ISSN

0001-7140

e-ISSN

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Svazek periodika

53

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

8

Strana od-do

51-59

Kód UT WoS článku

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EID výsledku v databázi Scopus

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