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  • 1
    Digitale Medien
    Digitale Medien
    Near-surface defects associated with 2.0-MeV 16O+ ion implantation in n-GaAs (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 739-743 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Using the technique of deep-level transient spectroscopy (DLTS), we have studied the formation of the defects in the near-surface region of n-GaAs implanted with different doses of 2.0-MeV 16O+ ions. Our results show that EL6 and the U band are the principal defect centers in room-temperature-implanted samples. In the case of samples implanted at 200 °C, DLTS results also show the presence of hole levels in addition to the EL6 and the U band. When the samples were subjected to rapid thermal annealing after room-temperature ion implantation, hole traps were the major defect centers in the near-surface region. Just below the surface region, however, limited recovery has occurred as shown by the re-emergence of electron traps. However, the defect structure is still different from that of the unimplanted samples. These results can be used to show the extent of lattice recovery after rapid thermal annealing. A mechanism is proposed to explain the evolution of the defects in MeV ion implanted n-GaAs.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.350360
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  • 2
    Digitale Medien
    Digitale Medien
    Influence of hydroxyls on the adhesion of Au films to GaAs (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 173-175 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The adhesion of Au metallization to GaAs substrates was studied as a function of the time to which freshly cleaved GaAs surfaces were exposed to de-ionized water or pure dry oxygen. It was found that the adhesion strength of Au metallization deposited on these surfaces is weakened from exposure to de-ionized water and the degradation is directly related to the length of the exposure. Exposure of the substrate surfaces to pure dry oxygen had no effect on the adhesion. The substrate surfaces were characterized as a function of exposure to these two environments and it was found that the Ga and As combine with the hydroxyl groups in the de-ionized water to form hydroxides and the As hydroxide dissolves leaving the surface As deficient. The extent of this reaction is dependent on the length of time the surface is exposed to the hydroxyl groups. Exposure of the substrate surface to pure dry oxygen results in a thin stable oxide layer.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.101220
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  • 3
    Digitale Medien
    Digitale Medien
    Electrical and metallurgical characteristics of PtxSi1−x/n-GaAs contacts (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 1225-1227 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Forward current–voltage characteristics of carrier transport at PtxSi1−x/n-GaAs interfaces have been measured in the as-deposited state and after annealing at 500 °C for 4 h. The single phase alloy Pt0.5Si0.5 shows Schottky diode characteristics with the barrier height (φb) 0.70 eV and the ideality factor (η) 1.17. Rutherford backscattering of He4 ions and Auger depth profiles for Pt, Si, Ga, and As reveal that the Pt0.5Si0.5/n-GaAs interface remains metallurgically inert even after the heat treatment. The observed metallurgical nonreactivity is reflected in the diode characteristics of the annealed samples which show negligible changes in φb and η. The silicon rich PtxSi1−x (x〈0.5) alloy compositions show near-Ohmic transport in the as-deposited and annealed states. These films are also metallurgically inert on annealing.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.338176
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  • 4
    Digitale Medien
    Digitale Medien
    Density measurements of a pulsed supersonic gas jet using nuclear scattering (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 1744-1747 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A method using nuclear scattering with an ion beam microprobe for characterizing the spatial and temporal density profile of a supersonic gas jet is described. The technique was applied to Ar and N2 gas jets from an axially symmetric DeLaval nozzle and the results are presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1144003
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  • 5
    Digitale Medien
    Digitale Medien
    Microcomputer-controlled chemiluminescence spectrometer for solid phase samples (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 191-196 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: An effective, low-cost microcomputer-controlled chemiluminescence detection system was developed for use in correlating the stability and aging of materials to the chemiluminescence emitted from the surface of these materials. The system is completely automated to record data as a function of time and sample temperature. In addition, spectra over the visible light region can be obtained under microcomputer control. A description of the hardware, computer interface, and programs as well as the use of the system are presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1138967
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  • 6
    Digitale Medien
    Digitale Medien
    Prompt phonon signals from particle interactions in Si crystals (1993)
    Springer
    Journal of low temperature physics 93 (1993), S. 365-375 
    Details
    ISSN: 1573-7357
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We discuss the prompt (ballistic and quasidiffuse) phonon physics associated with elementary particle interactions within silicon crystals at temperatures below 1 K, and the differences in the ballistic and quasidiffuse phonon production from primary electron recoils versus primary nuclear recoils within these crystals. We then summarize the results from a growing body of direct experimental evidence on prompt phonon signals from particle detectors bombarded with alphas, x-rays, and neutrons.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00693447
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  • 7
    Digitale Medien
    Digitale Medien
    The Polar Ionospheric X-ray Imaging Experiment (PIXIE) (1995)
    Springer
    Space science reviews 71 (1995), S. 385-408 
    Details
    ISSN: 1572-9672
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The Polar Ionospheric X-ray Imaging Experiment (PIXIE) is an X-ray multiple-pinhole camera designed to image simultaneously an entire auroral region from high altitudes. It will be mounted on the despun platform of the POLAR spacecraft and will measure the spatial distribution and temporal variation of auroral X-ray emissions in the 2 to 60 keV energy range on the day side of the Earth as well as the night. PIXIE consists of two pinhole cameras integrated into one assembly, each equipped with an adjustable aperture plate that allows an optimum number of nonoverlapping images to be formed in the detector plane at each phase of the satellite's eccentric orbit. The aperture plates also allow the pinhole size to be adjusted so that the experimenter can trade off spatial resolution against instrument sensitivity. In the principal mode of operation, one aperture plate will be positioned for high spatial resolution and the other for high sensitivity. The detectors consist of four stacked multiwire position-sensitive proportional counters, two in each of two separate gas chambers. The front chamber operates in the 2–12 keV energy range and the rear chamber in the 10–60 keV range. All of the energy and position information for each telemetered X-ray event is available on the ground. This enables the experimenter to adjust the exposure timepostfacto so that energy spectra of each X-ray emitting region can be independently accumulated. From these data PIXIE will provide, for the first time, global images of precipitated energetic electron spectra, energy inputs, ionospheric electron densities, and upper atmospheric conductivities.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00751336
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  • 8
    Digitale Medien
    Digitale Medien
    Chemiluminescence studies of the thermooxidation of PEEK (1988)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 26 (1988), S. 1205-1216 
    Details
    ISSN: 0887-6266
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: A highly sensitive microcomputer-controlled chemiluminescence apparatus capable of spectral resolution of emitted light has been used to study the oxidation of thermoplastic matrix material poly(ether ether ketone), PEEK, at 110°C in oxygen. Even after prolonged exposure and extensive decay in the chemiluminescence signal, the samples show no change in properties or accumulation of oxidation products. Evidence suggests that after oxygen-assisted initiation, reaction proceeds by radical transfer primarily of polymer phenoxy radicals in a type of radical aromatic substitution reaction on PEEK. Similar substitution-type biomolecular termination of polymer phenoxy radicals can lead to excited polymer and benzoquinone, emitters that account for much of the oxyluminescence spectrum of PEEK. Under the experimental conditions, the benzoquinone is volatile and the product polymer should be indistinguishable from starting polymer.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/polb.1988.090260605
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