J 2020

Thomson scattering versus modeling of the microwave plasma torch: a long standing discrepancy almost solved

VAN DER MULLEN, Joost, Mariana ATANASOVA, Adam OBRUSNÍK and Lenka ZAJÍČKOVÁ

Basic information

Original name

Thomson scattering versus modeling of the microwave plasma torch: a long standing discrepancy almost solved

Authors

VAN DER MULLEN, Joost, Mariana ATANASOVA, Adam OBRUSNÍK (203 Czech Republic, belonging to the institution) and Lenka ZAJÍČKOVÁ (203 Czech Republic, belonging to the institution)

Edition

Journal of analytical atomic spectrometry, Cambridge, Royal Society of Chemistry, 2020, 0267-9477

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10305 Fluids and plasma physics

Country of publisher

United Kingdom of Great Britain and Northern Ireland

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

Impact factor

Impact factor: 4.023

RIV identification code

RIV/00216224:14310/20:00117958

Organization unit

Faculty of Science

DOI

UT WoS

000569703600027

Keywords in English

plasma torches; light emission; microwaves

Tags

Tags

International impact, Reviewed
Změněno: 6/3/2024 14:51, Mgr. Marie Šípková, DiS.

Abstract

V originále

The characterization of plasmas gives much more insight if the results of modeling are compared with those of experiments. In the past, several modeling-experiment studies were performed on the microwave plasma torch (MPT). For the modeling a Global Plasma Model (GPM) was employed and for the experiment Thomson scattering (TS) was used. The same GPM-TS comparison was successfully applied to several other, more robust plasmas. However for the MPT it was found that the comparison led to severe discrepancies. The most salient feature was that the value of the electron temperature,T-e, found by TS, was substantially higher than what GPMs predicted. Several attempts were undertaken to solve this problem by refining the model and its most important input: the gradient of the electron density. The attention for the model implied that the TS technique was not scrutinized sufficiently. Recently it was discovered that the outcome of TS is very sensitive to the spectral fitting procedure. In the past this was carried out by employing the calibrated intensity using Gaussian fitting. However, a procedure based on the fitting of the spectral shape by using modified Gaussian fitting gives better results and leads to a lowerT(e)value, more in the range of the GPM results. This paper discusses the background of the GPM and gives the basis of TS fitting procedures and an analysis of the systematic error that can be made when TS is performed on filamentary MPT-like plasmas.

Links

LQ1601, research and development project
Name: CEITEC 2020 (Acronym: CEITEC2020)
Investor: Ministry of Education, Youth and Sports of the CR