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  • 1
    Digitale Medien
    Digitale Medien
    Point defect-based modeling of diffusion and electrical activation of ion implanted boron in crystalline silicon (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 176-186 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The time evolution of the transient enhanced diffusion and of the electrical activation of boron in crystalline silicon during thermal annealing subsequent to boron ion implantation is modeled by a system of diffusion-reaction equations for the dopant species and the silicon point defects. The concept of point defect impurity pair diffusion under equilibrium conditions is used to describe the diffusion process. Outdiffusion of implantation-induced silicon self-interstitials and the kick-out reaction Bi(large-closed-square)Bs+I are assumed to be the leading mechanisms for boron activation. In the case of low-dose boron ion implantation, we start from a defect distribution of Gaussian shape with one interstitial per implanted boron atom. For higher boron doses, the area density of this interstitial distribution is constant, but the depth position of its peak depends on boron dose. Local equilibrium for the reactions between the point defects and the boron species is postulated to be realized before the onset of diffusion. The computed boron depth profiles are compared to data from the literature. Implantation doses from 2×1014 cm−2 up to 5×1015 cm−2 are analyzed, annealing temperatures and times are considered over the ranges 800–1000 °C and 10 s–8 h, respectively. Although this approach is characterized by a number of simple assumptions, essential deficiencies are only found in certain cases of annealing subsequent to high-dose boron implantation. Trapping of free interstitials by extended defects seems to become important at low temperatures and for long annealing times. If the depth region with maximum boron concentration is in its as-implanted state close to amorphization, a boron overactivation which is beyond the present model can be found. For all other cases it is possible to achieve a reasonable modeling of transient enhanced diffusion and of electrical activation. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.360649
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  • 2
    Digitale Medien
    Digitale Medien
    Defect evolution in ultrathin films of polystyrene-block-polymethylmethacrylate diblock copolymers observed by atomic force microscopy (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 10111-10114 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: We track individual defects in the microdomain patterns of cylinder-forming polystyrene-block-polymethylmethacrylate films with atomic force microscopy to elucidate the evolution of diblock domain topology during annealing. This evolution takes place through relinking, joining, clustering, and annihilation of defects. Such processes form the basis for predicting structural change in polymer films. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.477702
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  • 3
    Digitale Medien
    Digitale Medien
    Production of the electronically excited NaCd excimer via resonant excitation of the metastable Cd(5p 3P1) level (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 8103-8108 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: We report the first evidence for the production of the electronically excited NaCd excimer following resonant excitation of the metastable Cd(5p 3P1) state. Dependence of intensity of emission from NaCd upon buffer gas pressure, temperature, and exciting laser wavelength is discussed and possible production mechanisms are proposed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.466804
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  • 4
    Digitale Medien
    Digitale Medien
    A new technique for differentiating between diffusion and flow in granular media using magnetic resonance imaging (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 4350-4355 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: We have shown that a simple nuclear magnetic resonance spin-tagging sequence for spatial encoding of the longitudinal magnetization, combined with an imaging sequence, can be used to measure flow and diffusion in granular materials. Using this technique, experiments have been performed to study flow and diffusion profiles during convection induced by the vertical shaking of a container (39 mm diameter) filled with a granular medium. We have shown that maximum diffusion and displacements occur in a thin boundary layer near the container's walls. The observed flow profiles are predominantly flat with relatively small positive displacements across the container with the exception of the boundary layer, where increasingly negative displacements are observed as the container's edges are approached. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1146491
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  • 5
    Digitale Medien
    Digitale Medien
    Two-detector coincidence routing circuit for personal computer-based multichannel analyzer (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 3069-3070 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A routing circuit for Oxford Instrument's PCA II multichannel analyzer card is described. The circuit allows recording of events requiring coincident signals from two out of four detectors. As an example, the use of the routing circuit in a time-differential perturbed angular correlation spectrometer is outlined. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1145531
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  • 6
    Digitale Medien
    Digitale Medien
    Molecular-dynamics simulations of steady-state growth of ion-deposited tetrahedral amorphous carbon films (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 1129-1135 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Molecular-dynamics calculations were performed to simulate ion beam deposition of diamond-like carbon films. Using the computationally efficient analytical potentials of Tersoff and Brenner we are able to simulate more than 103 carbon atom impacts on {111} diamond, so that steady-state film properties can be computed and analyzed. For the Tersoff potential, we achieve sp3 fractions approximately half of the experimentally observed values. For the more refined hydrocarbon potentials of Brenner the fraction of tetrahedrally coordinated atoms is much too low, even if structures with densities close to diamond are obtained. We show, that the sp3 contents calculated with Tersoff's potential are an artifact related to the overbinding of specific bonding configurations between three- and fourfold coordinated sites. On the other hand, we can prove, that the range for the binding orbitals represented by the cutoff function is too short in Brenner's parametrization. If an increased C–C interaction cutoff value is chosen, we achieve a distinct improvement in modeling the sp3 content of deposited ta-C films. As a result we compute sp3 fractions which lie between 52% and 95% for the C+ ion energies E=30–80 eV and are in reasonable agreement with recent experimental studies. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.373787
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  • 7
    Digitale Medien
    Digitale Medien
    Microcomputer-controlled perturbed angular correlation spectrometer (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 1694-1698 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A four-detector time-differential perturbed angular correlation spectrometer controlled by an inexpensive microcomputer is described. The use of twin-single-channel analyzers permits each detector to identify both gamma rays in the cascade. An improved gating logic system reduces the MCA/computer deadtime and allows larger sample activity and faster data accumulation. The twin-single-channel analyzer and gating circuit additions also permit simultaneous accumulation of two statistically independent sets of four-channel spectra. The spectrometer provides on-line display of raw data and the perturbation function derived from either set of four-channel spectra.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1139369
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  • 8
    Digitale Medien
    Digitale Medien
    Direct patterning of self-assembled nanocrystal monolayers by electron beams (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 1915-1917 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We demonstrate a method for laterally patterning metal nanocrystal monolayers. Extended monolayers are first self-assembled onto a solid substrate. Direct electron-beam exposure is then used to strip the dodecanethiol ligand coating from the nanocrystal cores, enabling the cores to stick to the underlying substrate. During a subsequent washing step in a solvent mixture, nanocrystals from the unexposed regions are removed and floated off, leaving behind the desired pattern. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1358363
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  • 9
    Digitale Medien
    Digitale Medien
    Low 1/f normal-state resistance noise in high-resistivity YBa2Cu3Oy films (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 133-135 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We have measured 1/f resistance noise at room temperature in laser-ablated YBa2Cu3Oy (YBCO) thin films over a wide range of normal-state resistivities. Surprisingly, the high resistivity films exhibit lower normalized noise powers than the low resistivity films. The lowest normalized noise power is 100 times lower than any previously reported values for single crystals of YBCO and is comparable to the lowest noise levels found in other cuprates. Upon oxygen reduction, the noise power in the high resistivity films increases monotonically whereas it decreases in the low resistivity films. We conclude that the high noise level in YBCO is most likely intrinsic to the structure and due to conduction along the Cu-O chains. Therefore, the low noise power in high resistivity films appears to indicate a degraded chain conductivity. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.115507
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  • 10
    Digitale Medien
    Digitale Medien
    Mesoscopic self-assembly of gold islands on diblock-copolymer films (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 422-424 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We describe the fabrication and characterization of self-assembled gold island arrays on diblock-copolymer thin films. The natural tendency of these polymers to form ordered phases is used to induce selective aggregation of evaporated gold metal during an annealing process. We obtain well-defined, nanoscale island arrays aligned with one of the copolymer blocks. Near perfect segregation is achieved between the two domains. Two types of diblock-copolymer systems are discussed, together with the resulting island patterns.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.111118
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