Measurement of quenching coefficients and development of calibration methods for quantitative spectroscopy of plasmas at elevated pressures

Francis, A.; Gans, Timo; Niemi, Kari; Czarnetzki, Uwe; Gathen, Volker Schulz-von der; Döbele, H. F.

doi:10.1117/12.459391

Cited by 8 publications

(3 citation statements)

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“…Collisional de-excitation (quenching) of the respective energy levels was considered by weighting the measured intensities with calculated effective de-excitation rates for the particular pressures. The collisional quenching coefficients for neon were estimated as suggested by Mahony et al [16] to be five times that of argon [17]. The discharge was operated in the 4:1 neon:argon composition at 5 kHz driving frequency f AC and ramp excitation with U pp = 780 V peak-to-peak voltage.…”

Section: Discharge Modementioning

confidence: 99%

Excitation dynamics of micro-structured atmospheric pressure plasma arrays

Boettner¹,

Waskoenig²,

O’Connell³

et al. 2010

J. Phys. D: Appl. Phys.

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Abstract. The spatial dynamics of the optical emission from an array of 50 times 50 individual micro cavity plasma devices are investigated. The array is operated in argon and argon-neon mixtures close to atmospheric pressure with an AC voltage. The optical emission is analysed with phase and space resolution. It has been found that the emission is not continuous over the entire AC period, but occurs once per half period. Each of the observed emission phases shows a self-pulsing of the discharge, with several bursts of emission of fixed width and repetition rate. The number of emission bursts depends on applied voltage and frequency. Spatially resolved measurements prove that the emission bursts are formed by overlapping emission pulses from single discharge cavities. Intensity differences between positive and negative half-wave can be interpreted through spatially resolved measurements of single discharge cavities.

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Section: Discharge Modementioning

confidence: 99%

Excitation dynamics of micro-structured atmospheric pressure plasma arrays

Boettner¹,

Waskoenig²,

O’Connell³

et al. 2010

J. Phys. D: Appl. Phys.

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“…At atmospheric pressure the influences of quenching will additionally have to be integrated into the analysis [25].…”

Section: Space and Phase Resolved Oesmentioning

confidence: 99%

Spatially resolved diagnostics on a microscale atmospheric pressure plasma jet

Gathen¹,

Schaper²,

Knake³

et al. 2008

J. Phys. D: Appl. Phys.

113

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Despite enormous potential for technological applications, fundamentals of stable non-equilibrium micro-plasmas at ambient pressure are still only partly understood. Micro-plasma jets are one sub-group of these plasma sources. For an understanding it is particularly important to analyse transport phenomena of energy and particles within and between the core and effluent of the discharge. The complexity of the problem requires the combination and correlation of various highly sophisticated diagnostics yielding different information with an extremely high temporal and spatial resolution. A specially designed rf microscale atmospheric pressure plasma jet (µ-APPJ) provides excellent access for optical diagnostics to the discharge volume and the effluent region. This allows detailed investigations of the discharge dynamics and energy transport mechanisms from the discharge to the effluent. Here we present examples for diagnostics applicable to different regions and combine the results. The diagnostics applied are optical emission spectroscopy (OES) in the visible and ultraviolet and two-photon absorption laser-induced fluorescence spectroscopy. By the latter spatially resolved absolutely calibrated density maps of atomic oxygen have been determined for the effluent. OES yields an insight into energy transport mechanisms from the core into the effluent. The first results of spatially and phase-resolved OES measurements of the discharge dynamics of the core are presented.

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“…Following our earlier proposal [39] we present here an extension of the PICLS concept that allows us to determine effective quenching rates by measuring the fluorescence signal decrease induced by a controlled photoionization loss, and to infer, consequently, absolute particle densities. It is sufficient to generate an ionization loss of the same order as the quenching loss.…”

Section: Extension To the Case Of Arbitrary Quenchers: Photoionizatiomentioning

confidence: 99%

Laser-induced fluorescence measurements of absolute atomic densities: concepts and limitations

Döbele¹,

Mosbach

Niemi³

et al. 2005

Plasma Sources Sci. Technol.

124

102

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The potential of laser-induced fluorescence spectroscopy of atoms is reviewed with emphasis on the determination of absolute densities. Examples of experiments with single-photon and two-photon excitation are presented. Calibration methods applicable with the different schemes are discussed. A new method is presented that has the potential to allow absolute measurement in plasmas of elevated pressure where collisional depletion of the excited state is present.

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Measurement of quenching coefficients and development of calibration methods for quantitative spectroscopy of plasmas at elevated pressures

Cited by 8 publications

References 0 publications

Excitation dynamics of micro-structured atmospheric pressure plasma arrays

Excitation dynamics of micro-structured atmospheric pressure plasma arrays

Spatially resolved diagnostics on a microscale atmospheric pressure plasma jet

Laser-induced fluorescence measurements of absolute atomic densities: concepts and limitations

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