Temperature and NO density measurements by LIF and OES on an atmospheric pressure plasma jet

Gessel, van Afh Bram; Hrycak, Bartosz; Jasiński, M.; Mizeraczyk, J.; Mullen, van der Jjam Joost; Bruggeman, Peter

doi:10.1088/0022-3727/46/9/095201

Cited by 82 publications

(98 citation statements)

References 21 publications

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“…For example, Stoffels et al showed that NO was one of the more important products for the helium “plasma needle” operating in air . Bruggeman et al measured absolute NO densities in various atmospheric pressure rare gas plasma jets and found values on the order of a few to a few tens of ppm (about 10 14 –10 15 cm −3 ). Higher values were reported by Vasilets and Shekter in their air plasma “torch” configuration: depending on the distance from the hot plasma region and the air gas flow, they measured NO concentrations from several hundred to several thousand ppm (∼10 15 cm −3 – 10 16 cm −3 ).…”

Section: Air Plasma Rons and Plasma–water Interactionmentioning

confidence: 99%

Reactive Species from Cold Atmospheric Plasma: Implications for Cancer Therapy

Graves

2014

Plasma Processes & Polymers

253

192

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Cold atmospheric plasmas (CAP) formed in air generate reactive oxygen and nitrogen species (RONS). RONS are biologically and therapeutically active agents and experimental evidence suggests that air plasmas shrink tumors by increasing oxidative and nitrosative stress on neoplastic tissue. Most mainline anti‐cancer therapies – including ionizing radiation and chemotherapies – also operate primarily via this pro‐oxidant, oxidative, and nitrosative stress mechanism. The main disadvantage of these conventional therapies is the development of treatment‐resistant cells. A key question for plasma cancer therapies is therefore whether or not cold plasma will lead to similar oxidative stress resistance. However, there are hints that combining nitrosative stress with oxidative stress via air plasma might avoid this problem. Plasma‐based cancer treatment may be a powerful and practical anti‐cancer agent, acting either alone or in combination with other therapies.

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Section: Air Plasma Rons and Plasma–water Interactionmentioning

confidence: 99%

Reactive Species from Cold Atmospheric Plasma: Implications for Cancer Therapy

Graves

2014

Plasma Processes & Polymers

253

192

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“…The setup is described in detail in our previous work. 17 As plasma source a coaxial microwave jet is used (see Hrycak et al 18 ), with a gas flow of 6.0 slm He with 3% of dry air. The microwave power (forward minus reflected power) is 30 W.…”

Section: A Experimental Setupmentioning

confidence: 99%

Thermalization of rotational states of NO A 2Σ+(v = 0) in an atmospheric pressure plasma

Gessel

Bruggeman

2013

The Journal of Chemical Physics

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Laser induced fluorescence (LIF) measurements of nitric oxide (NO) are performed in an atmospheric pressure microwave plasma jet, operated with a mixture of He and 3% air. The fluorescence signal of NO A(2)Σ(+)(v = 0) is measured time and fluorescence wavelength resolved. Based on the evolution of the rotational spectrum at different positions in the plasma, we determined the thermalization time of the rotational distribution of NO A after pumping a single transition, at temperatures in the range 300-1500 K. Also, a LIF-RET (rotational energy transfer) model is developed to simulate the RET and to calculate the thermalization time. The RET rate coefficients are calculated using the energy corrected sudden-exponential power scaling law. It was found that it is necessary to take the fine structure of the rotational states into account. At room temperature the results of the measurement and the simulation are consistent, and the thermalization occurs during the laser pulse (11 ± 1 ns). At elevated temperatures the measurements show a large increase in thermalization time, up to 35 ± 4 ns at 1474 K. This time is much longer than the laser pulse, and of the order of the NO A lifetime. This means that for spectroscopy measurements of the rotational states of NO A, the RET has to be taken into account to derive gas temperatures from the rotational distribution of NO A.

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“…In addition the NO density is measured by laser induced fluorescence and absolutely calibrated by a known gas mixture o f NO (3) . Both the NO and O densities are measured spatially resolved, and as function of admixed air to the He, and microwave power.…”

Section: Two-photon Absorption Laser Induced Fluorescence (Talif) Is mentioning

confidence: 99%

TALIF, LIF, Raman and Thomson scattering on a non-equilibrium atmospheric pressure plasma jet to unravel the plasma induced air Chemistry

Gessel

Grootel

Bruggeman

2013

2013 Abstracts IEEE International Conference on Plasma Science (ICOPS)

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Temperature and NO density measurements by LIF and OES on an atmospheric pressure plasma jet

Cited by 82 publications

References 21 publications

Reactive Species from Cold Atmospheric Plasma: Implications for Cancer Therapy

Reactive Species from Cold Atmospheric Plasma: Implications for Cancer Therapy

Thermalization of rotational states of NO A 2Σ+(v = 0) in an atmospheric pressure plasma

TALIF, LIF, Raman and Thomson scattering on a non-equilibrium atmospheric pressure plasma jet to unravel the plasma induced air Chemistry

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