Experimental and numerical investigation of a capacitively coupled low-radio frequency nitrogen plasma

Conti, Sergio; Porshnev, P. I.; Fridman, A. A.; Kennedy, Lawrence A.; Grace, J. M.; Sieber, K.; Freeman, D. R.; Robinson, K.

doi:10.1016/s0894-1777(01)00040-1

Cited by 18 publications

(9 citation statements)

References 26 publications

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“…Characteristic emissions from neutral and ionized molecular nitrogen were found and attributed to the second positive and first negative system of molecular nitrogen, respectively (Table 1). 14, 15 The values were nearly identical to the results published by Conti et al for a 40 kHz nitrogen plasma 7…”

Section: Resultssupporting

confidence: 83%

“…However, the presence of very reactive N + ions as evidenced by the emission line at 399.75 nm, is indicative of the existence of high energy electrons or photons (VUV photons), which are able to cleave N 2 into atomic nitrogen, a process that requires more than 9.8 eV. Conti et al analyzed the formation of different electron species in the low‐RF, capacitively coupled nitrogen plasma 7. There, the major part of the electrons is in the plasma bulk and they are characterized by a very low energy of 0.5 eV.…”

Section: Resultsmentioning

confidence: 99%

“…This can be ascribed to the complexity of the reactive plasma medium. For instance, in an radio frequency (RF)‐generated N 2 ‐plasma, many species such as N

_{2}^{+}

, N 2 * (excited), N, N + , electrons, as well as UV radiation are present 7…”

Section: Introductionmentioning

confidence: 99%

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Photoinitiator‐Free Plasma‐Induced Polymerization and Microstructuring of Acrylate‐Based Coatings on 3D Substrates

Elsner

Boulares-Pender

Hähnel

et al. 2009

Macro Materials & Eng

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The process of plasma curing of functional acrylates has been studied. For these purposes, a nitrogen plasma generated by a flat and a cylindrical electrode configuration, respectively, was used to provide both planar and 3D curing conditions. In selected cases, a double bond conversion >95% was observed by ATR‐IR spectroscopy for a 15 µm (wet thickness) acrylate coating even without the addition of any photoinitiator. Compared to UV curing, the surface energy of the cured substrates was significantly higher when plasma curing was applied (>70 mN · m−1); however, the hydrophilic surfaces experienced hydrophobic recovery. Finally, the generation of microstructures on uniaxially oriented substrates during the plasma process was studied and conditions for their tailor‐made creation are suggested.magnified image

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Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 99%

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Photoinitiator‐Free Plasma‐Induced Polymerization and Microstructuring of Acrylate‐Based Coatings on 3D Substrates

Elsner

Boulares-Pender

Hähnel

et al. 2009

Macro Materials & Eng

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“…It is can be seen that NII has many more strong emission lines in the visible range than does NI. Furthermore, nitrogen-discharge experiments [31] show that the optical emission spectrum in the visible and UV regions, is quite complex with multiple-peaks and many blended lines.…”

Section: G Nitrogenmentioning

confidence: 99%

Atomic transitions for adaptive optics

2021

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This paper reviews atoms and ions in the upper atmosphere, including the mesospheric metals Na, Fe, Mg + , Si + , Ca + , K and also non-metallic species N, N + , O, H, considering their potential for astronomical adaptive optics. Na and Fe are the best candidates for the creation of polychromatic laser guide stars, with the strongest returns coming from transitions that can be reached by excitation at two wavelengths. Ca + and Si + have strong visible-light transitions, but require short wavelengths, beyond the atmospheric cutoff, for excitation from the ground state. Atomic O, N and N + have strong transitions and high abundances in the mesosphere. The product of column density and cross section for these species can be as high as 10 5 for O and several hundred for N and N + , making them potential candidates for amplified spontaneous emission. However they require vacuum-ultraviolet wavelengths for excitation, which probably precludes their use for ground-based adaptive optics.

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“…Free radicals created can further react with reactive species in the gas phase [6,7]. Subsequently, a surface reacting with active nitrogen such as N 2 + and N 2 * [8] can react with other molecules such as metals [9,10], macromolecules [11] and so on. Nitrogen plasma can give rise to amine (-NH 2 ), imine (-CH=NH), cyano (-CN) and amide (-CO-NH) groups [12].…”

Section: Introductionmentioning

confidence: 99%

Surface modification of polypropylene by nitrogen-containing plasma

Jung

Myung

Choi

2008

Korean J. Chem. Eng.

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Polypropylene was treated with low pressure glow discharge plasma for the introduction of functional groups in its surface using plasma of different types. For this purpose plasma containing nitrogen and hydrogen and coating by deposition of thin plasma polymerized layers of functional group carrying monomer with NH 2 on it were used. The surface elemental composition was changed stoichiometrically by adjusting the plasma conditions depending on the feeding and plasma density. The optimum power plays an important role in the control of surface reactions between surface reactive species and plasma reactive species. Plasma-Polymerized-Allylamine (PPAa) thin film prepared with r.f. continuous and pulse wave power was characterized to study surface amine functionality. The surface amine content of PPAa at r.f. pulse wave power could be retained more efficiently than that of PPAa at r.f. continuous wave power because of less fragment of monomer. The stability test of r.f. pulse wave plasma polymerization indicated that the deposits of PPAa at the high r.f. pulse wave power were more stable than those at low r.f. pulse wave power after soaking it in tetrahydrofuran (THF).

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Experimental and numerical investigation of a capacitively coupled low-radio frequency nitrogen plasma

Cited by 18 publications

References 26 publications

Photoinitiator‐Free Plasma‐Induced Polymerization and Microstructuring of Acrylate‐Based Coatings on 3D Substrates

Photoinitiator‐Free Plasma‐Induced Polymerization and Microstructuring of Acrylate‐Based Coatings on 3D Substrates

Atomic transitions for adaptive optics

Surface modification of polypropylene by nitrogen-containing plasma

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