Editorial for plasma diagnostics using spectroscopic methods

Sasaki, Koichi; Engeln, Rah Richard; Barnat, Edward V.

doi:10.1088/1361-6463/aaa1b5

Cited by 6 publications

(2 citation statements)

References 9 publications

(9 reference statements)

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“…Several review papers have been published over the years that show the applicability of optical diagnostic techniques for the study of different types of plasma [6][7][8][9][10]. A collection of papers has been published very recently in a special issue of the 'Journal of Applied Physics D: Applied Physics' on plasma diagnostics using spectroscopic methods highlighting some of the recent developments in optical diagnostics for measuring physical parameters in low-temperature plasmas, with a focus on atmospheric-pressure plasmas [11]. A review devoted to the spectroscopic detection of molecular radicals in atmosphericpressure plasma has also recently been published [12].…”

Section: Introductionmentioning

confidence: 99%

Foundations of optical diagnostics in low-temperature plasmas

Engeln

Klarenaar

Guaitella

2020

Plasma Sources Sci. Technol.

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Over the past few decades many diagnostics have been developed to study the non-equilibrium nature of plasma. These developments have given experimentalists the possibility to measure in situ molecular and atomic densities, electron and ion densities, temperatures and velocities of species in the plasma, to just name a few. Many of the diagnostic techniques are based on the ‘photon-in, photon-out’ principle and were at first developed to perform spectroscopy on atoms and molecules. Much later they were introduced in the research of plasmas. In this foundation paper we will focus on optical-based diagnostics that are now for quite some time common use in the field of low-temperature plasma physics research. The basic principles of the diagnostics will be outlined and references will be given to papers where these techniques were successfully applied. For a more comprehensive understanding of the techniques the reader will be referred to textbooks.

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Section: Introductionmentioning

confidence: 99%

Foundations of optical diagnostics in low-temperature plasmas

Engeln

Klarenaar

Guaitella

2020

Plasma Sources Sci. Technol.

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“…For these reasons, various methods to characterize neutrals in excited states have been reported over the years, each with their advantages and limits [15]. Among the most popular, laser-induced fluorescence is based on monitoring radiative states that were pumped from the excited state of interest using a laser tuned to the relevant wavelength [12,16,17].…”

Section: Introductionmentioning

confidence: 99%

Ultra-high-resolution optical absorption spectroscopy of DC plasmas at low pressure using a supercontinuum laser combined with a laser line tunable filter and a HyperFine spectrometer

Durocher‐Jean

Jean-Ruel

Dion-Bertrand

et al. 2020

J. Phys. D: Appl. Phys.

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Optical absorption spectroscopy of non-equilibrium plasmas using a supercontinuum laser combined with a laser line tunable filter and a HyperFine spectrometer is examined. Owing to the <2 pm spectral resolution of the HyperFine system, details on the absorption line intensity, position and width can be obtained with very high precision using a broadband light emission source. As an example, absorption spectroscopy measurements were recorded in a reduced-pressure, nominally pure argon DC plasma column and allowed for the determination of the neutral gas temperature and the Ar 1s2 and Ar 1s4 (Paschen notation) number densities. At a pressure of 1 Torr, a discharge current of 20 mA, and an absorption length of 18 cm, the analysis of the Ar 2p3-1s2 and Ar 2p8-1s4 absorption lines at respectively 840.8 nm and 842.5 nm resulted in number densities of n 1 s 2 = 5.5 × 1015 m−3 and n 1 s 4 = 1.1 × 1016 m−3 and a neutral gas temperature of T g = 340 K. These values are typical of DC discharges operated under similar experimental conditions. While the fractional absorption of both lines decreased with decreasing optical absorption path, the number densities remained the same, as expected. Finally, the number densities increased with increasing discharge current, a result also coherent with the literature.

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