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  • 1
    Electronic Resource
    Electronic Resource
    Current-voltage characteristics of Na/p-GaP(110) Schottky diodes (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 4486-4487 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Schottky barrier of Na deposited onto ultrahigh vacuum cleaved p-type GaP has been determined by in situ current-voltage measurements. The Schottky barrier height of 1.10 eV for this low work function metal contacts is consistent with a general weak metal dependence for barrier formation on GaP(110).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352183
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  • 2
    Electronic Resource
    Electronic Resource
    Suppression of interface reaction and modification of band offset by Sb interlayers in CdS/InP (110) heterojunctions (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 4089-4091 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Core and valence level photoelectron spectra demonstrate that the deposition of monatomic interlayers at the interface between CdS and InP(110) efficiently suppresses the interface reaction characteristic for this system, and has a marked influence on the valence-band offset ΔEv.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352837
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  • 3
    Electronic Resource
    Electronic Resource
    Nonequilibrium molecular dynamics calculation of self-diffusion in a non-Newtonian fluid subject to a Couette strain field (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 2149-2158 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Molecular dynamics simulations have been performed on a simple fluid in the non-Newtonian regime in order to study the nature of diffusion in the presence of shear stress. The nonequilibrium molecular dynamics (NEMD) sllod algorithm is used to generate a homogeneous boundary driven Couette flow. The elements of the tensor of diffusion coefficients have been evaluated by three different routes: through Einstein relations with the corresponding elements of the tensor of molecule displacements, through Green–Kubo expressions involving tensor of momentum autocorrelation functions and cross-correlation functions, and by utilizing an NEMD color field method. All three routes to the tensor of diffusion coefficients are shown to yield consistent results. A simple spherically symmetric Lennard-Jones fluid at its triple point was used in the simulation study. We find that in a Couette strain field of sufficiently large strain rate, diffusion in all directions is enhanced substantially. We propose and verify a new asymptotic relationship between the diagonal elements of the tensor of diffusion coefficients and the strain rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459886
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  • 4
    Electronic Resource
    Electronic Resource
    Enhanced structure in polymers at interfaces (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 8542-8557 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We explore the conformations of an isolated chain molecule as it approaches an impenetrable planar surface, by exhaustive enumeration of all the three-dimensional self-avoiding flights on simple cubic lattices. We confirm the well-known results that as a chain approaches a surface, the number of accessible configurations diminishes, so there is an entropic repulsion, and the radius of gyration becomes anisotropic and the chain flattens. Our principal observation here is that proximity to a surface causes a chain molecule to develop enhanced amounts of certain forms of internal structural organization, namely, helices and antiparallel sheets, the main architectures observed in globular proteins. In addition, we compare the process of adsorption of: (i) chains that have no intrachain attraction (i.e., "open'' chains); with (ii) chains that have strong intrachain attraction (i.e., "compact'' chains). We confirm the well-known result that open chains undergo an adsorption transition onto the surface. However, we find that the adsorption of compact chains differs in one respect. Compact chains appear to undergo two types of transition depending on the strength of chain–surface attraction: (i) weak attraction leads to a "docking'' transition, in which the chain adsorbs without much deformation; (ii) strong attraction leads to a "flattening'' transition in which the chain adopts a two-dimensional ensemble of conformations on the surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460088
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  • 5
    Electronic Resource
    Electronic Resource
    Surface-induced enhancement of internal structure in polymers and proteins (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 8343-8351 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We study the conformations of chain molecules near interfaces by exhaustive simulation. We explore all the conformations accessible to a short isolated chain (16 monomers) on a 2-dimensional square lattice as a function of the distance of the center of mass of the chain from an interface. Our principal focus is on the "internal structure'' of the chain, certain simple patterns of intrachain contacts such as helices and sheets (planar zigzags). In the process of enumeration, we confirm the well-known result that chains near interfaces have fewer conformations than chains in the bulk. We also find that the persistence length increases, and the radius of gyration and end-to-end length become anisotropic as the chain approaches the interface. The main conclusion of this work is that chain molecules are predicted to often have enhanced amounts of internal structure when they are at or near interfaces. Steric constraints imposed by the interface are selective and exclusive, eliminating open conformations but not eliminating compact conformations such as helices and sheets. Therefore when a polymer, protein, or peptide chain is weakly attracted to an interface, internal structure should be induced or, if already present, it should be enhanced. In 2 dimensions, stronger attraction in some cases flattens the chain and obliterates this structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459317
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  • 6
    Electronic Resource
    Electronic Resource
    Erratum: Enhanced structure in polymers at interfaces [J. Chem. Phys. 94, 8542 (1991)] (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 3361-3361 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462902
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  • 7
    Electronic Resource
    Electronic Resource
    The effect of collisions in the multiphoton decomposition of 1-bromo 2-fluoroethane (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 1689-1694 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The multiphoton decomposition (MPD) of 1-bromo 2-fluoroethane, CH2BrCH2F, with a pulsed CO2 infrared laser is reported. The decomposition study was done at constant fluence and at pressures up to 2 kPa. Empirical representations of the pressure dependence of the MPD are reported. A collision-dependent reaction scheme is presented to explain the pressure dependence of the up-pumping through the vibrational manifold.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459096
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  • 8
    Electronic Resource
    Electronic Resource
    Proposal for measuring magnetic fluctuations in tokamaks by Thomson scattering (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 3540-3543 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Thomson scattering is proposed for the direct measurement of magnetic field fluctuations in a tokamak. The analysis is based on the electron fluid equations. The ordering λ(very-much-less-than)λturb(very-much-less-than)a, where λ and λturb are the incident and turbulence wavelengths, respectively, and a is the torus minor radius, is suggested by spectral information from observations on the TEXT tokamak, as well as general theoretical arguments. With this ordering, temperature effects are unimportant and an expression is derived for probe radiation-induced plasma polarization that depends upon density and magnetic fluctuations only. By choosing the incident probe beam to have its plane of polarization parallel to the local mean magnetic field B0, and observing the scattered power in the plane of polarization perpendicular to B0, it is shown that contributions from density fluctuations are automatically excluded. Faraday rotation is shown to have negligible influence on the scattered signal, which is accordingly determined by magnetic field fluctuations alone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141566
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetic stabilization of a rotating glow discharge (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 4708-4711 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A series of measurements have been made on a magnetically rotated glow discharge over a range of pressure of 24–53 mbars. An increase in the current at which the glow-to-arc transition occurred from 550 mA for a stationary discharge to 2.5 A at a magnetic flux density of 0.025 T for a rotating discharge, with a corresponding power increase at the glow-to-arc transition from 250 to 1540 W was measured. At magnetic flux densities of about 0.017 T a discontinuity in the discharge voltage was observed which was caused by the discharge rotating in its own wake. Results from other sources have indicated that a glow discharge can be maintained up to discharge currents of 10 A, however, the results obtained here under identical conditions indicate that the discharge was not a glow but an arc. The results have important implications to power limited glow-discharge processes such as CO2 lasers, ozone generation, and low-pressure chemical synthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339021
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of cathode surface area and separately stabilized cathodes on high power glow discharges for CO2 laser excitation (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 1363-1366 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Results are presented which indicate the importance of the cathode surface area and the advantage of using separately stabilized cathodes for the excitation of high power CO2 lasers. The results indicate that operation of a glow discharge with multiple cathodes of adequate surface area enables operation in the abnormal glow region at higher currents than with a single cathode of the same total surface area. Increase in the current at which the glow-to-arc transition occurs, improved stability, improved utilization of the laser cavity in the electrode region, and a wide range of variation of discharge current are also obtained using multiple cathodes. Large surface area multiple cathodes have been successfully demonstrated in a new high power fast axial flow CO2 laser using a single discharge tube operating at discharge currents of up to 1.8 A corresponding to laser output powers of up to 5 kW.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339964
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