Absolute calibration of OH density in a nanosecond pulsed plasma filament in atmospheric pressure He–H<sub>2</sub>O: comparison of independent calibration methods

Verreycken, T Tiny; Horst, van der; Sadeghi, N.; Bruggeman, Peter

doi:10.1088/0022-3727/46/46/464004

Cited by 61 publications

(86 citation statements)

References 38 publications

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“…The calibration procedure must include the accurate measurement of the saturation curve, in order to infer the beam size and to choose correctly the working regime. In particular, the beam size affects the calculated laser irradiance, that is the parameter with the largest effect on model outcomes [49].…”

Section: Discussionmentioning

confidence: 99%

“…RET collisions were considered also in [48] and [47]. The six-level model of [47] was also used in [49]. In this model the two ro-vibronic N and N' states involved in the absorption process are connected by total RET collision rates to two additional "lumped" states that include the whole remaining rotational manifold of the (X,v=0) and (A,v=1) vibro-electronic states.…”

Section: Literature Surveymentioning

confidence: 99%

“…In [42] a DBD discharge was placed in the same position as the plasma jet and used as a source of OH, whose concentration had been previously determined by TR-BBAS. In [49] various OH calibration methods are compared. Although tested in a nanosecond pulsed plasma filament, these methods are useful for plasma jets too, and indeed for any ATP discharge type.…”

Section: Saturation Characteristics and Calibration Constantmentioning

confidence: 99%

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Laser induced fluorescence in atmospheric pressure discharges

Dilecce

Martini

Tosi

et al. 2015

Plasma Sources Sci. Technol.

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Abstract.This paper offers an outline of Laser Induced Fluorescence (LIF) diagnostics and practical recommendations for its use in atmospheric pressure discharges. LIF principles, technical requirements and rationalization of experimental outcomes by modelling are addressed. Important issues that are particularly relevant to small scale, spatially inhomogeneous discharges, like plasma-jets, are emphasized. For the first time, all collision processes and the spatial non-homogeneity of the laser beam are together accounted for in the LIF model. Saturation characteristics are discussed and used for the assessment of model parameters. A calibration procedure is discussed and implemented. Gas temperature measurements by LIF are also addressed. The whole description of the technique is given, without loss of generality, through the example of its application to the OH radical. Notes on other diatomic radicals, CH, NO and CN, are given along the paper. Some results in a RF plasma-jet are presented as an example of application in a discharge system where all the concepts developed in the paper are applied.

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Section: Discussionmentioning

confidence: 99%

Section: Literature Surveymentioning

confidence: 99%

Section: Saturation Characteristics and Calibration Constantmentioning

confidence: 99%

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Laser induced fluorescence in atmospheric pressure discharges

Dilecce

Martini

Tosi

et al. 2015

Plasma Sources Sci. Technol.

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“…Unfortunately -doubling was also overlooked in previous work of the authors of this work. In equation (3) of [17], the factor 2 was by misprint in the denominator and the OH densities determined from broadband UV absorption and by LIF calibrated with Rayleigh scattering in [10,17,23,24] are a factor 2 too low. However this does not alter the conclusions made in the above references.…”

Section: Oh Density Calibration Pitfallsmentioning

confidence: 99%

Time-resolved absolute OH density of a nanosecond pulsed discharge in atmospheric pressure He–H₂O: absolute calibration, collisional quenching and the importance of charged species in OH production

Verreycken

Sadeghi

Bruggeman

2014

Plasma Sources Sci. Technol.

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Link to publication Citation for published version (APA):Verreycken, T., Sadeghi, N., & Bruggeman, P. J. (2014). Time-resolved absolute OH density of a nanosecond pulsed discharge in atmospheric pressure He-H2O : absolute calibration, collisional quenching and the importance of charged species in OH production. Plasma Sources Science and Technology, 23(4), 45005-1/9. DOI: 10.1088/0963-0252/23/4/045005 General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. AbstractThe time-resolved OH density in a nanosecond pulsed filamentary discharge in an atmospheric pressure He-H 2 O(0.05%) mixture is measured using laser induced fluorescence. The lifetime of the excited OH(A) state is found to be strongly time dependent during the plasma pulse, with the shortest decay time occurring at the moment the plasma is switched off. The measured LIF intensity is corrected for this time-resolved quenching and calibrated using Rayleigh scattering. Time-resolved electron density (n max e = (7.6 ± 0.8) × 10 21 m −3 ), He ( 3 S 1 ) metastable density (He max m = (1.6 ± 0.3) × 10 20 m −3 ), gas temperature (T max g = (350 ± 60) K) and optical emission are presented and used in the interpretation of the observed time dependence of the OH density. Based on these experimental data, it is shown that for the present discharge conditions, OH is mainly produced by charge transfer reactions to water followed by dissociative recombination of the water ion. In addition, two often encountered issues with the calibration of OH LIF are highlighted with an example.

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“…In single-photon LIF, calibration of the optical properties of the system especially under the assumptions described above is relatively simple. In simple cases, the species density can be derived from dynamic measurements in the afterglow of the discharge, evaluating the relative species density evolution using the chemical kinetics model [160][161][162][163]. To calibrate LIF precisely, two fundamentally different approaches are possible.…”

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Reactive species in non-equilibrium atmospheric-pressure plasmas: Generation, transport, and biological effects

et al. 2016

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Non-equilibrium atmospheric-pressure plasmas have recently become a topical area of research owing to their diverse applications in health care and medicine, environmental remediation and pollution control, materials processing, electrochemistry, nanotechnology and other fields. This review focuses on the reactive electrons and ionic, atomic, molecular, and radical species that are produced in these plasmas and then transported from the point of generation to the point of interaction with the material, medium, living cells or tissues being processed. The most important mechanisms of generation and transport of the key species in the plasmas of atmospheric-pressure plasma jets and other non-equilibrium atmosphericpressure plasmas are introduced and examined from the viewpoint of their applications in plasma hygiene and medicine and other relevant fields. Sophisticated high-precision, timeresolved plasma diagnostics approaches and techniques are presented and their applications to monitor the reactive species and plasma dynamics in the plasma jets and other discharges, both in the gas phase and during the plasma interaction with liquid media, are critically reviewed. The large amount of experimental data is supported by the theoretical models of reactive species generation and transport in the plasmas, surrounding gaseous environments, and plasma interaction with liquid media. These models are presented and their limitations are discussed. Special attention is paid to biological effects of the plasma-generated reactive oxygen and nitrogen (and some other) species in basic biological processes such as cell metabolism, proliferation, survival, etc. as well as plasma applications in bacterial inactivation, wound healing, cancer treatment and some others. Challenges and opportunities for theoretical and experimental research are discussed and the authors' vision for the emerging convergence trends across several disciplines and application domains are presented to stimulate critical discussions and collaborations in the future. 4 3.5 Optical absorption spectroscopy 3.5.1 Ozone 3.5.2 UV broadband absorption of OH density 3.5.3 Cavity ring-down spectroscopy 3.5 Selected non-optical techniques 3.5.1 Mass spectrometry 3.5.2 Flow visualization 3.5.3 Electron paramagnetic resonance spectroscopy 4. Temporal and spatial behaviour of key reactive species 4.1 Electron density (n e) 4.2 O atoms 4.2.1 Effect of admixture of O 2 /air on O concentration 4.2.2 Diffusion effect of shielding gas on O production 4.3 OH radical 4.3.1 Effect of H 2 O admixture on OH concentration 4.3.2 Effect of gas flow on OH concentration 4.3.3 Effect of O 2 on OH production 4.3.4 Effect of the treated samples on OH concentration 4.3.4.1 Effect of humidity of treatment sample on OH distribution 4.3.4.2 Effect of sample conductivity on OH distribution 4.3.4.3. Effect of the amplitude of the applied voltage on OH distribution 4.3.4.4. The effect of gas flow on OH distribution 4.3.4.5. The effect of the surface characteristics on OH distribution 4.3.5 Effe...

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Absolute calibration of OH density in a nanosecond pulsed plasma filament in atmospheric pressure He–H₂O: comparison of independent calibration methods

Cited by 61 publications

References 38 publications

Laser induced fluorescence in atmospheric pressure discharges

Laser induced fluorescence in atmospheric pressure discharges

Time-resolved absolute OH density of a nanosecond pulsed discharge in atmospheric pressure He–H₂O: absolute calibration, collisional quenching and the importance of charged species in OH production

Reactive species in non-equilibrium atmospheric-pressure plasmas: Generation, transport, and biological effects

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Absolute calibration of OH density in a nanosecond pulsed plasma filament in atmospheric pressure He–H2O: comparison of independent calibration methods

Cited by 61 publications

References 38 publications

Laser induced fluorescence in atmospheric pressure discharges

Laser induced fluorescence in atmospheric pressure discharges

Time-resolved absolute OH density of a nanosecond pulsed discharge in atmospheric pressure He–H2O: absolute calibration, collisional quenching and the importance of charged species in OH production

Reactive species in non-equilibrium atmospheric-pressure plasmas: Generation, transport, and biological effects

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Absolute calibration of OH density in a nanosecond pulsed plasma filament in atmospheric pressure He–H₂O: comparison of independent calibration methods

Time-resolved absolute OH density of a nanosecond pulsed discharge in atmospheric pressure He–H₂O: absolute calibration, collisional quenching and the importance of charged species in OH production