The chemistry of radiofrequency discharges: Acetylene and mixtures of acetylene with helium, argon and xenon

Vasile, M. J.; Smolinsky, G.

doi:10.1016/0020-7381(77)83002-7

Cited by 58 publications

(49 citation statements)

References 19 publications

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“…52 It begins with nucleation, the formation of the primary clusters from the gas. 35,[58][59][60][61] The production of acetylenic compounds ͑C 2 H x ͒ plays a very important role as a key mechanism of the particle formation in hydrocarbon plasma ͑CH 4 , C 2 H 2 , and C 2 H 4 ͒. Both experimental 53-55 and theoretical 56,57 results show that small linear chains of C x with x Ͻ 10 are formed; purely monocyclic rings with 10 Ͻ x Ͻ 20, bicyclic rings with 20Ͻ x Ͻ 30, and tricyclic with x Ͼ 30, and so on ͑polycyclic͒.…”

Section: A a General Growth And Atomic Structure Model Of A-c : H Mamentioning

confidence: 99%

Size dependence of optical properties and internal structure of plasma grown carbonaceous nanoparticles studied by in situ Rayleigh-Mie scattering ellipsometry

Hong

Winter

2006

Journal of Applied Physics

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We have analyzed the growth process of a-C:H nanoparticles in Ar–C2H2 and Ar–CH4 plasmas by means of in situ Rayleigh-Mie scattering ellipsometry. Complex refractive index (m=n−ki), mean particle radius (r), and particle size distribution (σ) of a-C:H nanoparticles are carefully determined and compared with those of a-C:H thin films deposited at similar conditions. It is found that, in both plasmas, small particles (r<25nm) have graphitelike properties whereas large particles have polymerlike characteristics. These results indicate that the particles have internal structures of a hard core and soft mantles on it. The size distribution of the nanoparticles in both Ar–CH4 and Ar–C2H2 plasmas is essentially monodisperse with a narrow Gaussian size distribution. A systematic comparison between the growth and atomic structure models for a-C:H materials and criteria for interstellar dust (ISD) grains known from astrophysical observations is made. Significant agreement is found in a wide range of radii, supporting earlier findings that plasma-polymerized a-C:H nanoparticles might be a good candidate as an ISD analog.

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Section: A a General Growth And Atomic Structure Model Of A-c : H Mamentioning

confidence: 99%

Size dependence of optical properties and internal structure of plasma grown carbonaceous nanoparticles studied by in situ Rayleigh-Mie scattering ellipsometry

Hong

Winter

2006

Journal of Applied Physics

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“…For comparison, we refer to Smolinsky and Vasila's mass spectrometric measurements. 10 They measured the 20 eV electron ionization mass spectrum when C 2 H 2 flowed through an rf discharge; H 2 and C 4 H 2 were observed. However, many species, which exhibited very intense peaks in our spectrum, are absent in theirs.…”

Section: B Stable (Closed Shell) Moleculesmentioning

confidence: 99%

Neutral product analysis of the microwave C2H2 plasma: Cn, CnH2, CnH3, CnH4, CnH5, and larger species

Fujii

1997

Journal of Applied Physics

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Product analysis of microwave (MW) C2H2 discharge by Li+ ion attachment mass spectrometry demonstrates the unexpected formation of many unfamiliar hydrocarbon neutral products. The experiments were conducted under MW discharge conditions in which the peak intensities for the ionic species leaving the MW C2H2 plasma were barely detectable which permits confirmation of these neutral compound in the gas phase. Various free radicals as well as stable polymer molecules were clearly present. The latter are classified as Cn (n=4, 6, and 8), CnH2 (n=2, 3, 4, 6, and 8), CnH4 (n=2, 3, 4, 6, and 8), and so on, where n is the carbon number. Radicals such as CnH3 (n=2 and 4), CnH5 (n=2, 4, and 6), CnH7 (n=3 and 4), and CnH9 (n=4) were detected. Some of these species, which have been observed in the interstellar space, have been identified mass spectrometrically for the first time. We believe that integrating a Li+ ion attachment reactor with quadrupole mass spectrometry can create a powerful instrument for installation on spacecraft.

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“…The ion-neutral reaction (6) is described in detail in Ref. 30 . The present work0 shows the presence of C 4 H 2 and C 4 H 2 þ , which are not present in great concentration in the simulation done in Ref.…”

Section: Resultsmentioning

confidence: 99%

N‐isopropylacrylamide decomposition process in helium plasma

Martı́nez

Rodrı́guez-Lazcano

2006

J of Applied Polymer Sci

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Emission spectroscopy was applied to observe decomposed species of N-isopropylacrylamide (NIPAAm) exposed to He plasma, which was generated by AC discharge at the pressure of 400 Pa. As the NIPAAm monomer was exposed to He plasma, light emitted from the NIPAAm and plasma was monitored. In the diagnosis measurement, several emission peaks assigned to the H a and H b atomic lines, CH 3 O, CN(B 2 S-X 2 P), CH(A 2 D-X 2 P), and C 3 H 5 , CN, CHO, CH 2 O, and C 4 H 2 þ transitions were observed and measured at various discharge times. The present results show the presence of C 4 H 2 and C 4 H 2 þ *, which are not manifested in great concentration in the simulation of RF acetylene discharge. The time dependence of the emission intensities was also investigated. When the discharge time of He plasma was increased, the emission intensities of the observed transitions also increased and then gradually decreased.

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The chemistry of radiofrequency discharges: Acetylene and mixtures of acetylene with helium, argon and xenon

Cited by 58 publications

References 19 publications

Size dependence of optical properties and internal structure of plasma grown carbonaceous nanoparticles studied by in situ Rayleigh-Mie scattering ellipsometry

Size dependence of optical properties and internal structure of plasma grown carbonaceous nanoparticles studied by in situ Rayleigh-Mie scattering ellipsometry

Neutral product analysis of the microwave C2H2 plasma: Cn, CnH2, CnH3, CnH4, CnH5, and larger species

N‐isopropylacrylamide decomposition process in helium plasma

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