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  • 1
    Electronic Resource
    Electronic Resource
    The chemisorption and reaction of BCl3 with Si(111) (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 4907-4911 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The chemical mechanisms involved in the decomposition of boron trichloride and the concomitant incorporation of elemental boron into Si(111) were elucidated. The reaction between BCl3 and Si(111) is quit complex due to the presence of Si, B, and Cl in a number of chemically distinct environments simultaneously. Annealing the sample to 570 °C effectively desorbs all molecularly adsorbed BCl3. Additional anneals to 710 and 870 °C largely reduce the BCl2 and BCl3 moeities to form the subsurface-boron reconstructed surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352057
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  • 2
    Electronic Resource
    Electronic Resource
    A mechanism for diborane induced selectivity loss in the chemical vapor deposition of silicon from SiH2Cl2 (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 4544-4546 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The interaction between B2H6 and SiO2 was investigated by soft x-ray photoemission. Thermally activated, autocatalytic dissociative chemisorption of B2H6 on SiO2 to form elemental films was discovered at temperatures exceeding 550 °C. These surfaces are shown to be quite reactive towards SiH2Cl2. This process is thus a mechanism whereby the selectivity of chemical vapor deposition exhibited by SiH2Cl2 towards SiO2 can be rapidly degraded.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351384
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  • 3
    Electronic Resource
    Electronic Resource
    Calculated structures for [001] symmetrical tilt grain boundaries in silicon (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 2048-2056 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The structures of [001] tilt boundaries in silicon have been systematically investigated by computer modeling, using the harmonic Keating potential to describe the interatomic forces. The full angular range of symmetrical tilt boundaries can be described in terms of linear combinations of characteristic groupings of atoms. More than one stable relaxed structure has been found for most grain boundaries. In all cases the relaxed bicrystal consists of localized groups of pure edge or 45° dislocation cores embedded in a tetrahedrally coordinated, stable structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348730
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  • 4
    Electronic Resource
    Electronic Resource
    Observation of gold evaporated on graphite (00.1) cleaved surfaces (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 6520-6522 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Gold evaporated on air-cleaved (00.1) graphite was observed by scanning tunneling microscopy. Most individual gold islands were not stable during scanning; some islands even appeared to translate. These observations suggest that the interaction between the gold islands and the scanning tunneling microscope tip is stronger than that between the gold and the air-cleaved graphite substrate. Some gold islands were observed to be stable. It was deduced that stable islands at steps were located on the upper layer rather than on the lower layer. It is also deduced that the alignment of the elongated gold grains in the continuous film may be related to cleavage steps.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346856
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  • 5
    Electronic Resource
    Electronic Resource
    Evidence for valence hole localization in the Auger decay and fragmentation of carbon and silicon tetrafluorides (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 2162-2166 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Monochromatic synchrotron radiation was used to excite selectively core electrons of the carbon and fluorine atoms in carbon tetrafluoride and silicon and fluorine in silicon tetrafluoride. The fragmentation processes were examined using time-of-flight mass spectroscopy. The mass spectra show the distribution of ions collected in coincidence with low and high energy electrons. Distinct changes in the mass spectra with atomic site of excitation and photon energy are observed. The observation of F2+ ions following fluorine 1s excitation in SiF4 provides significant evidence for a "valence bond depopulation'' mechanism involving the formation of a localized, two-hole final state that persists on the time scale of fragmentation. In contrast, no F2+ was observed for CF4, which indicates that fragmentation for this molecule is more characteristic of a delocalized two-hole state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456011
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  • 6
    Electronic Resource
    Electronic Resource
    Angular dependence of photofragments from K-shell excited N2 and O2: Photoabsorption anisotropy and excited state symmetry (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 7936-7945 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The symmetry of excited states reached by photoexcitation of K-shell electrons of N2 and O2 is identified from the fragmentation anisotropy. For each molecule, ion yield excitation spectra were obtained at 90°, 54.7°, and 0° relative to the axis of soft x-ray polarization. The degree of polarization of the synchrotron radiation was determined experimentally. From this determination and the angular dependence of the ion yield, the photoabsorption anisotropy parameter β is obtained as a function of photon energy. Variations in the β spectra are discussed in terms of previously assigned spectral features and are compared with other experimental results. A comparison also is made with theoretical calculations, which are available for the case of N2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459323
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  • 7
    Electronic Resource
    Electronic Resource
    Novel applications of photonic band gap materials: Low-loss bends and high Q cavities (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 4753-4755 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this paper we discuss a novel material which has nearly ideal properties at optical frequencies. It combines the low dissipation of a dielectric with the reflectivity of a metal. This material employs a two-dimensional photonic band gap structure to achieve in-plane confinement of light and uses index contrast to achieve vertical confinement. We discuss how this material can be used to create microcavities for the production of low threshold lasers and waveguides capable of low-loss bends.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355934
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  • 8
    Electronic Resource
    Electronic Resource
    Anomalous superperiodicity in scanning tunneling microscope images of graphite (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 2396-2398 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An anomalously large periodicity has been observed in scanning tunneling microscope images of a (00.1) graphite sample. The unusual contrast has hexagonal symmetry, a periodicity of 7.7±0.2 nm and is superimposed on the usual a=0.246 nm atomic spacing of graphite. Current-voltage curves recorded in the scanning tunneling spectroscopy mode from the region showing the superperiodicity exhibit slightly more metallic behavior than those from neighboring normal regions. One possible explanation for the observed periodicity is that it is a rotational moiré pattern resulting from the overlap between a misoriented layer of graphite and the underlying graphite single crystal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102906
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  • 9
    Electronic Resource
    Electronic Resource
    Special grain boundaries in YBa2Cu3O7 (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 2344-2345 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The orientation distribution produced in strings of YBa2Cu3O7−x often referred to as 123, crystals produced from a melt is not random. The individual crystals are kinematically free to rotate during the coalescence process and it is found that coincidence site lattice misorientations are selected. This observation suggests that grain boundaries in 123 have structures related to those in other crystalline materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100520
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  • 10
    Electronic Resource
    Electronic Resource
    Low-temperature amorphous-to-crystalline transformation of CoSi2 films (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 1311-1313 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Amorphous-to-crystalline transformation of e-gun co-deposited CoSi2 films occurs from 150 to 200 °C, as observed by in situ resistivity measurement and transmission electron microscopy. Resistivity changes abruptly from 1500 to 110 μΩ cm as the amorphous film transforms into circular crystallites that are circular before impingement occurs. A room-temperature resistivity of 30 μΩ cm was obtained by annealing the film to 500 °C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99683
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