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Journal of the Society for Information Display 01/2012; 6(1):43-48. · 1.02 Impact Factor
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ABSTRACT: Spectral lines observed at short delay times and close to the target during laser ablation of YBa 2 Cu 3 O x show strongly distorted line shapes arising partly from optical refraction by the large density gradients within the expanding plume. Spatially and temporally resolved linewidths, corrected for refraction effects, are reported for the Ba(I) 553.5 nm absorption transition and Stark widths, deduced from these corrected linewidths, indicate that the maximum electron number density at 1.0 mm from target is ∼1×10<sup>19</sup> cm<sup>-3</sup>. © 1996 American Institute of Physics.
Journal of Applied Physics 08/1996; · 2.17 Impact Factor
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ABSTRACT: The ground state atomic hydrogen density in a hydrogen/acetylene discharge is compared with the diamondlike carbon (DLC) film quality as determined from in situ ellipsometry measurement of the refractive index. Two‐photon laser‐induced fluorescence (LIF) was employed for the detection of the ground state atomic hydrogen in the rf generated discharge. Absolute atomic hydrogen number densities were determined by calibrating the LIF detection system using a transfer standard. A direct correlation was found between the level of molecular hydrogen dissociation in the plasma and the refractive index of the DLC film. © 1995 American Institute of Physics.
Applied Physics Letters 07/1995; · 3.84 Impact Factor
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ABSTRACT: Pulsed laser deposition (PLD) from a hot pressed manganese doped ZnS target using a KrF laser, has produced a high rate deposition method for growing luminescent thin films. Good stoichiometric quality and typical luminescent crystal structures have been observed with a predominant hexagonal phase and little evidence of the cubic phase. The luminescent characteristics were determined by cathodoluminescence and photoluminescence excitation and stable electroluminescence was observed under pulsed dc conditions with a minimum brightness of 150 cd/m<sup>2</sup>. PLD film characteristics are compared with those observed in radio‐frequency sputtered samples.
Applied Physics Letters 11/1993; · 3.84 Impact Factor
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ABSTRACT: The optimization of interrelated deposition parameters during deposition of in situ YBa 2 Cu 3 O 7 thin films on MgO 〈001〉 substrates by KrF laser ablation was systematically studied in a single experimental chamber. The optimum condition was found to be a substrate temperature of 720 °C and a target‐substrate distance of 5 cm in an oxygen partial pressure of 100 mTorr. These conditions produced films with T c = 87 K. The presence of YO in the plasma plume was found to be important in producing good quality films. The films were characterized by resistance‐temperature measurements, energy dispersive x‐ray analyses, scanning electron microscopy, and x‐ray‐diffraction measurements, and the physical reasons underlying film quality degradation at parameter values away from optimal are discussed.
Journal of Applied Physics 09/1991; · 2.17 Impact Factor
