Laser Thomson Scattering, Raman Scattering and laser-absorption diagnostics of high pressure microdischarges

Donnelly, Vincent M.; Belostotskiy, Sergey; Economou, Demetre J.; Sadeghi, N.

doi:10.1088/1742-6596/227/1/012011

Cited by 7 publications

(5 citation statements)

References 10 publications

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“…Three different modes of operation, namely chaotic, bullet and continuous, were proposed based on the experimental data [37,38]. Various active spectroscopic techniques were utilized in recent works, namely laser-induced fluorescence spectroscopy, diode laser absorption spectroscopy and Rayleigh, Thomson and Raman scattering of laser radiation on microplasmas [39][40][41][42][43][44][45][46]. These measurements uncovered spatially resolved distribution (down to 10-50 m) of densities and temperatures of various plasma species such as electrons, molecules and metastable atoms.…”

Section: Brief Description Of Plasma Diagnosticsmentioning

confidence: 99%

Plasma for cancer treatment

Keidar

2015

Plasma Sources Sci. Technol.

385

290

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Plasma medicine is a relatively new field that grew from research in application of lowtemperature (or cold) atmospheric plasmas in bioengineering. One of the most promising applications of cold atmospheric plasma (CAP) is cancer therapy. Convincing evidence of CAP selectivity towards the cancer cells has been accumulated. This review summarizes the state of the art of this emerging field, presenting various aspects of CAP application in cancer such as the role of reactive species (reactive oxygen and nitrogen), cell cycle modification, in vivo application, CAP interaction with cancer cells in conjunction with nanoparticles, and computational oncology applied to CAP.

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Section: Brief Description Of Plasma Diagnosticsmentioning

confidence: 99%

Plasma for cancer treatment

Keidar

2015

Plasma Sources Sci. Technol.

385

290

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“…48 Recently, plasma density and electron temperature in for RF microdischarges and DC microdischarges were measured using Thomson scattering on free plasma electrons (laser frequencies ) x p , m ). 8,49,50 These measurements are characterized by outstanding spatial resolution down to 10-50 lm. However, the method has limited sensitivity when plasma ionization degree is low, namely, minimal detectable plasma ionization degree of about 10 À6 was indicated ($10 13 cm À3 for atmospheric pressure discharges), due necessity to extract signal related to Thomson scattering on free plasma electrons from large amplitude background signal produced by Rayleigh scattering on molecules.…”

Section: G Plasma Density Measurementsmentioning

confidence: 99%

“…However, the method has limited sensitivity when plasma ionization degree is low, namely, minimal detectable plasma ionization degree of about 10 À6 was indicated ($10 13 cm À3 for atmospheric pressure discharges), due necessity to extract signal related to Thomson scattering on free plasma electrons from large amplitude background signal produced by Rayleigh scattering on molecules. 8,[49][50][51] In addition, laser Thomson scattering method was only used with discharges associated with time-independent plasma density since long accumulation of signal (tens of milliseconds) is required in order to achieve detectable signal level. 8,49…”

Section: G Plasma Density Measurementsmentioning

confidence: 99%

Experimental approaches for studying non-equilibrium atmospheric plasma jets

Shashurin

Keidar

2015

Physics of Plasmas

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This work reviews recent research efforts undertaken in the area non-equilibrium atmospheric plasma jets with special focus on experimental approaches. Physics of small non-equilibrium atmospheric plasma jets operating in kHz frequency range at powers around few Watts will be analyzed, including mechanism of breakdown, process of ionization front propagation, electrical coupling of the ionization front with the discharge electrodes, distributions of excited and ionized species, discharge current spreading, transient dynamics of various plasma parameters, etc. Experimental diagnostic approaches utilized in the field will be considered, including Rayleigh microwave scattering, Thomson laser scattering, electrostatic streamer scatterers, optical emission spectroscopy, fast photographing, etc. V

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“…This includes various spectroscopic techniques, namely passive optical emission spectroscopy, laser-induced fluorescence spectroscopy, diode laser absorption spectroscopy and Rayleigh, Thomson and Raman scattering of laser radiation on microplasmas1415161718192021. These techniques are characterized by good spatial resolution (down to 10–50 μm) and minimal detectable values of plasma electron density of ~10 13 cm −3 , but require great stability of the discharge since they are based on averaging over large number of discharge events.…”

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confidence: 99%

Electric discharge during electrosurgery

Shashurin

Scott

Zhuang³

et al. 2015

Sci Rep

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Electric discharge utilized for electrosurgery is studied by means of a recently developed method for the diagnostics of small-size atmospheric plasma objects based on Rayleigh scattering of microwaves on the plasma volume. Evolution of the plasma parameters in the near-electrode sheaths and in the positive column is measured and analyzed. It is found that the electrosurgical system produces a glow discharge of alternating current with strongly contracted positive column with current densities reaching 103 A/cm2. The plasma electron density and electrical conductivities in the channel were found be 1016 cm−3 and (1-2) Ohm−1cm−1, respectively. The discharge interrupts every instance when the discharge-driving AC voltage crosses zero and re-ignites again every next half-wave at the moment when the instant voltage exceeds the breakdown threshold.

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Laser Thomson Scattering, Raman Scattering and laser-absorption diagnostics of high pressure microdischarges

Cited by 7 publications

References 10 publications

Plasma for cancer treatment

Plasma for cancer treatment

Experimental approaches for studying non-equilibrium atmospheric plasma jets

Electric discharge during electrosurgery

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