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  • 1985-1989  (43)
  • 1950-1954  (2)
  • 1
    Digitale Medien
    Digitale Medien
    Variable-energy positron-beam studies of SiO2/Si irradiated by ionizing radiation (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 473-475 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Variable-energy positron-beam studies have been carried out on Si with a 1.61 μm overlayer of SiO2 irradiated by x ray and γ ray up to the dose of 5×105 R. The Doppler broadening of annihilation photons was found to be strongly influenced by x-ray irradiation, and the effect was extended homogeneously over the entire oxide layer. A trapping model which neglects positron diffusion effects was applied to the dependence of the line shape parameter S on incident positron energy.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.100616
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  • 2
    Digitale Medien
    Digitale Medien
    Electrical properties of hydrogenated amorphous silicon layers on a polymer film substrate under tensile stress (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 1678-1680 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The electrical properties of hydrogenated amorphous silicon (a-Si:H) layers on a polyethylene terephthalate (PET) film were studied under tensile stress. As the a-Si:H layers were stretched about 1.5%, dark conductivity and photoconductivity decreased gradually at first and then steeply beyond a critical strain. It was found that the former behavior was caused by a piezoresistance effect and the latter was attributed to breaking weak SiSi bonds, as shown by an increase of the electron spin resonance (ESR) intensity of Si dangling bonds. These changes of conductivity and ESR signal intensity were almost completely restored by annealing the a-Si:H layer at 150 °C for 1 h while relaxed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.101431
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  • 3
    Digitale Medien
    Digitale Medien
    Laser-induced fluorescence measurement and analytical model for the reaction probability of CF2 on Si (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 2775-2777 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We investigate an analytical model for concentration profiles of reactive gas-phase species adjacent to surfaces, as determined by optical probe techniques. The model is illustrated with measurements of CF2, detected by laser-induced fluorescence, above silicon and other substrates. Conditions under which the model is applicable are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.337110
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  • 4
    Digitale Medien
    Digitale Medien
    Magneto-optical properties of Fe-B-F films (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3250-3252 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Films have been preprared by sputtering over a wide range of compositions in the Fe-B-F system. Fluorine was supplied by rf sputtering from an FeF3 target, and Fe-B by dc sputtering from arc-melted targets. Most of the samples were amorphous, although some contained a relatively small fraction of crystalline FeF2. The films were ferromagnetic, with Curie temperatures above room temperature and with room-temperature saturation magnetizations of 60 to 150 emu/g. Large Faraday coefficients, up to 105 deg/cm at 633 nm and fairly large Kerr rotations were observed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.338925
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  • 5
    Digitale Medien
    Digitale Medien
    Formation and properties of very high-conductivity CdTe film made by evaporation (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 4215-4217 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Very high-conductivity n-type CdTe films with large crystallite size were prepared by vacuum coevaporation of CdTe and Cd and the electrical properties and the structure were investigated. The highest dark conductivity at room temperature of the film obtained was 6.5×103 S cm−1. The conductivity decreased with the increase of the ambient temperature. The electron concentration increased and the mobility decreased with the temperature. The film was a polycrystalline hexagonal phase and the crystallite size was a few tens of μm.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.337509
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  • 6
    Digitale Medien
    Digitale Medien
    Laser-assisted chemical vapor deposition of Si: Low-temperature (〈600 °C) growth of epitaxial and polycrystalline layers (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 979-982 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Pulsed KrF laser irradiation (248-nm or 5-eV photons) during the chemical vapor deposition of Si from SiH4 has been used to periodically melt and rapidly resolidify thin layers of continuously deposited material. From one-dimensional heat-flow calculations, the increase in the average film growth temperature for the conditions used in these experiments was less than 1° C, the melt depth ranged from ∼5 to 40 nm, and the resolidification velocity was 2 to 3 ms−1. By proper choice of laser energy density E, pulse repetition rate f, and film deposition rate R, the melt depth was adjusted to correspond to a value slightly larger than the film thickness deposited between pulses. Using this procedure, we have grown polycrystalline Si films on SiO2 and Si single crystals on (100)Si substrates at average growth temperatures Ts between 535 and 650 °C. The polycrystalline films had average grain sizes of 1 to 2 μm with a (111) preferred orientation. Films grown without laser irradiation, but otherwise under the same conditions, were amorphous at Ts〈580 °C and fine-grained polycrystalline at higher temperatures. The room-temperature conductivity of irradiated In-doped polycrystalline films grown at Ts=565 °C was ∼5 orders of magnitude higher than the conductivity of unirradiated films. Irradiated single-crystal films doped with B exhibited room-temperature hole mobilities which were near the maximum theoretical bulk values for the corresponding carrier concentrations (∼1018 cm−3).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.336144
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  • 7
    Digitale Medien
    Digitale Medien
    High-resolution Compton profile spectrometer for 29.5-keV x rays with a combination of crystal analyzer and imaging plate : International conference on synchrotron radiation instrumentation (SRI−88) (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 2402-2405 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A high-resolution Compton spectrometer has been installed for 29.5-keV incident x rays from a vertical wiggler inserted in the 2.5-GeV storage ring of the Photon Factory at Tsukuba. This spectrometer consists of bent-crystal monochromator, a Cauchois-type bent-crystal analyzer, and an imaging plate as a position sensitive detector. The overall momentum resolution is 0.084 a.u. for the incident x-ray energy of 29.5 keV. High-resolution Compton profile measurements on Al, a quasicrystal Al-Li-Cu, and solid and liquid phase of Li are shown to demonstrate the performance of this spectrometer.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1140730
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  • 8
    Digitale Medien
    Digitale Medien
    Synchrotron radiation lithography system in an atmospheric environment (invited) : INTERNATIONAL CONFERENCE ON SYNCHROTRON RADIATION INSTRUMENTATION (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 1643-1648 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: The atmospheric environmental exposure system for synchrotron radiation (SR) lithography has been integrated using the Photon Factory storage ring (2.5 GeV). The system, composed of a highly reliable beamline, an SR extracting chamber and a prototype SR stepper, aims at attaining higher accuracy and throughput. Based on a fail-safe mechanism notion, a double-vacuum protection system, in which two sets of a fast closing valve and acoustic delay line are installed in the main beamline and branch beamline, respectively, has been organized. Vacuum breakdown tests indicated that any vacuum breakdown, a beryllium (Be) window rupture in the worst case, exerts little influence on the storage ring ultrahigh vacuum. The SR extracting chamber, equipped with a Be window and an extraction window, is filled with helium at atmospheric pressure. Particularly, the 50-μm-thick, 35-mm-diam Be window, vacuum-sealed by a Viton O-ring, was preliminarily employed and, so far, has operated successfully, giving a 25-mm square exposure area. In terms of practical availability and simplicity, the SR stepper in an atmospheric environment has been constructed. A novel differential mode linear Fresnel zone plate alignment method, which can detect an alignment error between a mask and a wafer during exposure, was developed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1141050
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  • 9
    Digitale Medien
    Digitale Medien
    Hydrogen atom abstraction by O(3P) from diborane and ethane (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 6282-6289 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: We measured, via LIF, time-dependent concentrations of OH resulting from the reaction of O(3 P) with B2H6 and C2H6. The oxygen atoms were generated by titrating microwave discharged N2 /He with NO to the chemiluminescent end point. The operating pressures in the flow reactor ranged from 5 to 15 Torr; the mixtures consisted of He/O(3 P)/fuel in the approximate ratios 100/1/0.1 to 100/1/1. Flow conditions were such that in the low pressure experiments the controlled residence time prior to detection were 0.8–17 ms; under the higher pressure conditions, the time interval covered was 2–35 ms. We estimated that the temperature of the reaction region was (approximate)350 K, based on rotational emission temperatures measured for BO*, generated under closely similar conditions. First a complete mechanism was derived for ethane for a specified set of experimental parameters. For ethane, a single set of experimental conditions was selected for ratioing the recorded intensity to the computed OH density; this was cross checked with other runs for ethane. Finally, a mechanism was developed for B2H6, which quantitatively checked our experimentally determined profiles both in shape and magnitude, for three sets of conditions, and within a factor of 2 for the high concentration runs (100% B2H6 feeding into the reactor at 14 Torr).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.454751
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  • 10
    Digitale Medien
    Digitale Medien
    Morphological and phagocytic characteristics of peritoneal exudate cells in tilapia, Oreochromis niloticus (Trewavas), and carp, Cyprinus carpio L. (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 29 (1986), S. 0 
    Details
    ISSN: 1095-8649
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: The morphology and phagocytic activity of peritoneal exudate cells (PEC) obtained by an intraperitoneal injection of liquid paraffin into tilapia, Oreochromis niloticus, and carp, Cyprinus carpio, were studied with light and electron microscopy. PEC consisted of monocyte-macrophage series cells (M-Mø), neutrophils, eosinophils (granular cells) and others. Cells exhibiting the same morphology as mammalian macrophages but different from monocytes of the same species were identified with light and electron microscopy and designated as peritoneal macrophages. Light and electron microscopy revealed that M-Mø, neutrophils and eosinophils (granular cells) phagocytozed foreign materials added in vivo and in vitro. Eosinophils appeared later in the peritoneal exudate and less actively phagocytic as compared with M-Mø and neutrophils. Small and large phagosomes were formed in M-Mø, neutrophils and eosinophils (granular cells). Large phagosomes were common in neutrophils. Fusion of cytoplasmic granules with the phagosome membrane was observed. The in vitro experiment on phagocytosis revealed that the phagocytic rates in M-Mø and neutrophils were positively correlated with the doses of foreign materials. The results indicated that these two cell types have the highest capacity of phagocytosis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1095-8649.1986.tb04951.x
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