Overview of Plasma Diagnostic Techniques

Hebner, G. A.; Miller, Paul A.; Woodworth, J. R.

doi:10.1007/978-3-642-56989-0_5

Cited by 9 publications

(7 citation statements)

References 93 publications

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“…The theories of a plasma probe are not as trivial as its construction. A number of theories are presented to explain the physical mechanisms responsible for the operation [2][3][4][5][6]15]. When probe is inserted into the plasma, it is biased with different positive and negative voltages to draw a characteristic curve between the applied probe voltage and the output current shown in figure 1.…”

Section: Theory and Calculationsmentioning

confidence: 99%

“…Inverse plasma frequency corresponds to the plasma response time to local perturbation. This is also referred as a distance traveled by a thermal electron to cover a distance of Debye length [2][3][4][5][6].…”

Section: Theory and Calculationsmentioning

confidence: 99%

“…The schizophrenic behavior of plasma is an interesting area of research where plasma parameters are used as tools to characterize its nature and behavior. They include temperature, density, frequency and time, Debye length and number of particles in Debye's sphere [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

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Collective behavior of silver plasma during pulsed laser ablation

et al. 2015

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The present work reports an electrical investigation of silver plasma using a self-fabricated Langmuir probe in air and under a low vacuum (~10 -3 torr). A silver target was irradiated with a Q-switched Nd:YAG laser with the wavelength 1.064 µm, energy 10 mJ, pulse duration 9-14 ns and power 1.1 MW. The collective behavior of a silver plasma plume is studied using a Langmuir probe as an electrical diagnostic technique. By applying different positive and negative voltages to the probe, the respective signals are collected on a four channels digital storage oscilloscope having a frequency of 500 MHz. An I-V curve helps to measure electron temperature and electron density directly and plasma frequency, response time, Debye length and number of particles in 'Debye's sphere' indirectly using the theory of Langmuir probe and mathematical formulas. The floating potential is measured as negative for laser induced silver plasma in air and vacuum, following the theory of plasma.

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Section: Theory and Calculationsmentioning

confidence: 99%

Section: Theory and Calculationsmentioning

confidence: 99%

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Collective behavior of silver plasma during pulsed laser ablation

et al. 2015

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“…A small amount of Ar ͑3.2 vol %͒ was added to the CF 4 /O 2 mixture for argon actinometry measurements, one of the plasma diagnostic methods. 9 It has been demonstrated that the addition of Ar in a small quantity (Ͻ5 vol %) does not perturb the discharge properties of a CF 4 /O 2 mixture. 10,11 Mass spectra of the downstream effluent of the plasma were collected using a conventional quadrupole mass spectrometer ͑QMS; ULVAC, MSQ-300͒ which was operated at a fixed electron impact energy of 70 eV.…”

Section: Apparatus and Techniques For Corrosion Testmentioning

confidence: 99%

Corrosion Behavior of Stainless Steel and Aluminum in a Downstream Environment of CF[sub 4]/O[sub 2] Microwave Plasma

Hara

Mukuhara

Ohtomo

et al. 2002

J. Electrochem. Soc.

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The corrosion characteristics of type 316 stainless steel, component metals of the steel (Fe, Cr, Ni, and Mo), and Al in the downstream effluent of a CF4/O2 plasma have been examined as a function of temperature (25-300°C) and feed gas composition (0-30 vol % O2false). Type 316, Fe, and Ni showed weight gains due to the formation of surface reaction films, which consist predominantly of involatile metal fluorides and grow parabolically with exposure time. Pure Cr and Mo exhibited weight losses due to the formation of volatile metal fluorides or oxyfluorides. The corrosion rate of these metals increased with increasing temperature, while that of Al was less than the limit of detection at all temperatures examined. The corrosion rates of Cr and Mo increased with increasing O2 content of the reactant gas and reached maxima at ∼20 normalvol% O2, whereas those of type 316, Fe, and Ni were nearly independent of the O2 content. At 300°C, Cr2O3 films underwent etching in a similar manner as Cr metal, while Fe2O3, NiO, and Al2O3 films transformed into involatile fluorides or oxyfluorides. Mass spectrometric analyses suggested that F atoms and O2 molecules are dominant species responsible for corrosion in the downstream effluent. The phase stability diagrams estimated metal fluorides to be the thermodynamically favored reaction products on the metals exposed to the effluent. © 2002 The Electrochemical Society. All rights reserved.

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“…In contemporary research, the focus is given to the development of plasma-treated seeds and to meet the challenges to increase food production and ensure food safety. Plasma originally being searched as fusion energy has been currently used in medicine, agriculture, surface modifications, pollution control, electronics, water sterilization, etc [4][5][6][7][8][9][10]. Plasma treatment has resulted in the establishment of a distinct, quickly expanding area known as 'plasma agriculture' in today's world.…”

Section: Introductionmentioning

confidence: 99%

Impact of non-thermal plasma treatment on the seed germination and seedling development of carrot (Daucus carota sativus L.)

et al. 2021

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Seed germination is a complicated physiological process that starts with the seed absorbing water and concludes with the radicle emerging. The kinetics and amount of water uptake by seeds are known to be influenced by both seed surface properties and the surrounding environment. As a result, altering seed surface features are linked to seed medium and is a valuable strategy for controlling seed germination. In the agricultural field, non-thermal plasma surface activation of seeds is currently being investigated as an efficient pre-sowing treatment for modifying seed germination. The impact of non-thermal plasma (NTP) on the germination and seedling growth of carrot seeds at room temperature and atmospheric pressure for varied treatment times was investigated in this study. Seed's germination properties and growth parameters were examined for both control and NTP treated seeds. Germination-related parameters such as germination percentage, vigor index, and chlorophyll content were all improved by NTP treatment. However, no significant changes were seen in the carotenoid content. Similarly, the in-vitro radical scavenging activities, total phenol, and total flavonoid contents in the seedlings were altered by NTP treatment. Our results indicate that NTP treatment has a favorable effect on carrots germination and seedling development.

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Overview of Plasma Diagnostic Techniques

Cited by 9 publications

References 93 publications

Collective behavior of silver plasma during pulsed laser ablation

Collective behavior of silver plasma during pulsed laser ablation

Corrosion Behavior of Stainless Steel and Aluminum in a Downstream Environment of CF[sub 4]/O[sub 2] Microwave Plasma

Impact of non-thermal plasma treatment on the seed germination and seedling development of carrot (Daucus carota sativus L.)

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