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  • 1990-1994  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Afterglow decay kinetics of nonuniform plasmas with cylindrical symmetry: Application to the measurement of electron decay in large, photoionized plasmas in atmospheric-pressure helium (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 3917-3923 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experiments and analytical methods for determining electron-ion recombination and attachment coefficients in highly collisional, cylindrically symmetric plasmas are presented. Photoionization by sparkboard light sources of tetrakisdimethylaminoethylene (TMAE) seeded in atmospheric-pressure helium is used to produce the plasma. The electron density is probed by microwave transmission techniques. The effective recombination coefficient for electrons recombining with TMAE ions in atmospheric pressure helium is found to be (9.0±1.1)×10−6 cm3 s−1 for Te=300 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352269
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Time-resolved optical emission and electron energy distribution function measurements in rf plasmas (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 1290-1296 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Comparisons between experimentally measured time-dependent electron energy distribution functions and optical emission intensities are reported for low-frequency (100 and 400 kHz) radio-frequency driven discharges in argon. The electron energy distribution functions were measured with a time-resolved Langmuir probe system. Time-resolved optical emissions of argon resonance lines at 687.1 and 750.4 nm were determined by photon-counting methods. Known ground-state and metastable-state excitation cross sections were used along with the measured electron energy distribution functions to calculate the time dependence of the optical emission intensity. It was found that a calculation using only the ground-state cross sections gave the best agreement with the time dependence of the measured optical emission. Time-dependent electron density, electron temperature, and plasma potential measurements are also reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351735
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Plasma properties of a hydrocarbon arcjet used in the plasma deposition of diamond thin films (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 6187-6190 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Plasma-deposited thin films of polycrystalline diamond were achieved with an arcjet plasma. The jet operated with hydrogen gas with small admixtures of CH4. The diamond films were highly nonuniform, probably due to the very high gradients of the chemical species and temperatures within the arcjet-substrate system. The arcjet apparatus, and optical emission spectra and Langmuir probe diagnostics of the plasma are described. Also presented are results for the surface chemical analysis of the diamond film using surface analysis by laser ionization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346909
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Observations of strong microwave absorption in collisional plasmas with gradual density gradients (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 5089-5094 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Strong microwave absorption was observed when a 10 GHz source illuminated an underdense collisional plasma that had a density gradient scale length several wavelengths long. Significant reductions in angular scattering and cross-polarized components were also observed. These experiments confirm that absorption was the dominant process. The plasma was created by the photoionization of tetrakisdimethylaminoethylene molecules seeded into atmospheric pressure helium. Sparkboard arrays provided the intense vacuum ultraviolet ionizing radiation. Plasma density profiles were measured using transverse scans of 9.7 GHz probe microwaves and were found to approximate an Epstein profile. The absorption at 10 GHz by this plasma was as large as 28 dB in direct backscattering and 15–20 dB when orthogonally polarized microwaves were launched and detected. The peak absorption scales with sparkboard energy in a way that suggests that electron-ion recombination is the dominant electron-loss mechanism at high plasma densities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352038
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Raman examination of a plasma arcjet deposited diamond film (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 1090-1092 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A chemical vapor deposited diamond film was grown on a silicon substrate by the plasma arcjet method. The deposited film was circular and appeared to be radially zoned under visual examination. A secondary electron microscope was used to examine the surface morphology and microfocus Raman spectroscopy was used to examine the radial compositional variation of the film. Raman spectroscopy shows that the composition of the diamond film changed markedly in the space of hundreds of microns. Changes in the Raman spectra can be correlated with variations in morphology of the diamond film.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103542
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Multi-beam laser deflection measurements of reduced density channels created by electron beams propagating in near-atmospheric-pressure air (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 5341-5348 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Properties of reduced density channels created by energy deposition from electron beams propagating in air are presented. A multi-beam laser deflection technique used to diagnose the channels is described, as are representative examples of density channels formed in multi-pulse propagation experiments performed at the Advanced Test Accelerator at the Lawrence Livermore National Laboratory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354235
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    Paper (German National Licenses)
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