A Guide to Laser-Induced Fluorescence Diagnostics in Plasmas

Freegarde, Tim; Hancock, Gus

doi:10.1051/jp4:1997403

Cited by 17 publications

(9 citation statements)

References 18 publications

(23 reference statements)

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“…The ion concentration n 0 right in front of the electrode turns out to be two orders of magnitude lower than the ion density in the bulk plasma (n i,max ≈ 1.2 × 10 10 cm −3 ). This effect was expected and agrees with other published data [18][19][20][21].…”

Section: Excitation By Electron Impact In the Sheathsupporting

confidence: 94%

Spatial density profiles of the N₂metastable state A³Σ_u⁺, the B³Π_gand C³Π_ustates in an asymmetric rf discharge

Krames

Glenewinkel‐Meyer

Meichsner

2001

J. Phys. D: Appl. Phys.

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A laser-induced fluorescence technique, in combination with optical emission spectroscopy, was applied to investigate the spatial distribution of the number densities of neutral species in an asymmetric low-pressure 27.12 MHz discharge in pure nitrogen. The primary targets of this investigation were the three nitrogen triplet states C 3 u , B 3 g and the metastable A 3 + u each in their lowest vibrational levels v = 0, 1, 2 and additionally v = 8 of A 3 + u which can be populated very efficiently in the plasma sheath. The absolute number densities of all these states were determined in a Rayleigh scattering experiment, the results of which have been published elsewhere (Krames B, Glenewinkel-Meyer T and Meichsner J 2001 J. Appl. Phys. 89 3115). The spatial profiles as a function of the discharge parameters were studied by varying the gas pressure between 10 and 100 Pa and the effective rf voltage up to 260 V. These profiles of the different molecular states vary markedly in the plasma bulk as well as in the sheath near the powered electrode. A model, which includes the production, diffusion and quenching rates of contributing species and also fluorescence cascade processes, explains these varieties. A comparison with the experimental data at 50 Pa confirms the results of the model calculations.

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Section: Excitation By Electron Impact In the Sheathsupporting

confidence: 94%

Spatial density profiles of the N₂metastable state A³Σ_u⁺, the B³Π_gand C³Π_ustates in an asymmetric rf discharge

Krames

Glenewinkel‐Meyer

Meichsner

2001

J. Phys. D: Appl. Phys.

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“…These new cross section data are now being employed in a range of spectroscopic diagnostic techniques where the noble gas is present as a fill gas or as a diagnostic additive to complement or to serve as an alternative to Langmuir probes (see, e.g., [19]). Many of these studies involve laser-induced fluorescence (LIF) which is emitted directly by the decay of the perturbation induced in the population of the upper level of the laser transition [21]. Over the past few years there have been new developments which investigate laser collisionally induced fluorescence (LCIF).…”

Section: Introductionmentioning

confidence: 99%

The application of CW laser collisionally induced fluorescence modelling to determine neon excited-state electron collisional rate coefficients

Borthwick¹,

Paterson²,

Smith

et al. 2000

J. Phys. B: At. Mol. Opt. Phys.

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We describe a method for the determination of rate coefficients for collisional excitation out of the 1s states of a noble gas using continuous-wave laser collisionally induced fluorescence (CW LCIF, i.e. fluorescence from an upper level which is not that of the laser transition). The intensity of CW LCIF lines from an upper 2p level that is strongly coupled to an influential 1s level is dominated by the electron collisional rate out of that level. By an appropriate choice of LCIF line we fit our recently published theory to experimental observations to determine a set of electron collisional direct 1s mixing and 1s-2p excitation rate coefficients. The values of coefficients determined in this way show very good agreement with those which have been calculated using cross section data from the literature with the measured electron temperature. For cases where accurate cross section data are available for the 1s-2p transitions CW LCIF diagnostics should, via these rate coefficients, provide reliable values of the bulk electron temperature.

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“…To obtain high signal intensity, temporal resolution and spectral selectivity, fluorescence is usually excited by lasers. In plasma physics, laser-induced fluorescence (LIF) [1,2] is currently the leading method for the detection of radicals, [1,3,4] metastables [5,6] and some ions. [7,8] LIF provides high sensitivity, a low limit of detection and high…”

Section: Introductionmentioning

confidence: 99%

Solution to the perturbation of LIF measurements via photodissociation, OH measurement in atmospheric‐pressure multihollow DBD

Dvořák

Procházka

Krumpolec

et al. 2020

Plasma Processes & Polymers

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This study solves the problem of the invasivity of laser-induced fluorescence (LIF) measurements caused by photodissociation. It is shown with the example of OH LIF that the excess signal caused by laser-induced photodissociation can be distinguished from the true LIF signal of the naturally presented species by This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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A Guide to Laser-Induced Fluorescence Diagnostics in Plasmas

Cited by 17 publications

References 18 publications

Spatial density profiles of the N₂metastable state A³Σ_u⁺, the B³Π_gand C³Π_ustates in an asymmetric rf discharge

Spatial density profiles of the N₂metastable state A³Σ_u⁺, the B³Π_gand C³Π_ustates in an asymmetric rf discharge

The application of CW laser collisionally induced fluorescence modelling to determine neon excited-state electron collisional rate coefficients

Solution to the perturbation of LIF measurements via photodissociation, OH measurement in atmospheric‐pressure multihollow DBD

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A Guide to Laser-Induced Fluorescence Diagnostics in Plasmas

Cited by 17 publications

References 18 publications

Spatial density profiles of the N2metastable state A3Σu+, the B3Πgand C3Πustates in an asymmetric rf discharge

Spatial density profiles of the N2metastable state A3Σu+, the B3Πgand C3Πustates in an asymmetric rf discharge

The application of CW laser collisionally induced fluorescence modelling to determine neon excited-state electron collisional rate coefficients

Solution to the perturbation of LIF measurements via photodissociation, OH measurement in atmospheric‐pressure multihollow DBD

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Spatial density profiles of the N₂metastable state A³Σ_u⁺, the B³Π_gand C³Π_ustates in an asymmetric rf discharge

Spatial density profiles of the N₂metastable state A³Σ_u⁺, the B³Π_gand C³Π_ustates in an asymmetric rf discharge