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  • American Institute of Physics (AIP)  (40)
  • Periodicals Archive Online (PAO)
  • 1985-1989  (56)
  • 1
    Electronic Resource
    Electronic Resource
    An investigation of the annihilated unrestricted Hartree–Fock wave function and its use in second-order Møller–Plesset perturbation theory (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 1789-1795 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The recently introduced annihilated unrestricted Hartree–Fock (AUHF) wave function—in which the first spin contaminant in an unrestricted Hartree–Fock (UHF) wave function has been annihilated self-consistently—is discussed in some detail with particular attention to its use as a basis for a perturbation expansion. A series of calculations are presented highlighting the advantages and disadvantages of a second-order Møller–Plesset (AUMP2) perturbation treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457084
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic field effects on triplet exciton fission and fusion in a polydiacetylene (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 6642-6646 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have studied the origin and decay dynamics of triplet excitons in the conjugated polymer poly(4BCMU) in its sol(yellow) and gel(red) phases. Wavelength and intensity dependencies of the triplet yield show that the triplet exciton cannot be produced by excitation into the singlet exciton edge but only from higher lying states. The observed lifetime of the triplet state, coupled with the magnetic field dependence of the triplet state production and decay, indicate that the triplet state is created by a fission process from the excited singlet. The time and magnetic field dependence of the triplet exciton decay indicate that the triplet exciton decay in the red phase occurs by diffusive bimolecular fusion, but in the yellow phase the triplet exciton decay is nondiffusive. We postulate that the unimolecular decay of the triplet exciton in the yellow phase results from exciton pinning by conformational disorder.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456281
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  • 3
    Electronic Resource
    Electronic Resource
    Solution to boundary value problems using the method of maximum entropy (1989)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 30 (1989), S. 302-306 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The method of maximum entropy is used to solve a class of linear boundary value problems. The method is based on using various moments of the differential equation as constraints when maximizing the entropy. Various examples are presented and compared to exact solutions for varying numbers of moments. It is found that the maximum entropy approximation is, in many cases, better than a Fourier series solution for a given number of expansion terms and moments. The method is very general and will find applications in many areas of physics. A comparison of the amount of work necessary for the maximum entropy solution versus finite difference techniques is presented and it is found that the maximum entropy technique shows promise as an alternative solution technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.528445
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  • 4
    Electronic Resource
    Electronic Resource
    Four-dimensional boson field theory. III. Nontriviality (1987)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 28 (1987), S. 1146-1158 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The results of numerical investigations based on series analysis indicate clearly that the method of phantom fields constructs nontrivial, self-interacting scalar Euclidean boson field theories. It is found that these continuum theories arise as the scaling limit to normal critical points of lattice statistical mechanical models. The character of these theories is numerically indistinguishable from that of a classical theory on the lambda line near the tricritical point.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.527818
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  • 5
    Electronic Resource
    Electronic Resource
    Four-dimensional boson field theory. II. Existence (1986)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 27 (1986), S. 2379-2393 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The existence of the continuum, quantum field theory found by Baker and Johnson [G. A. Baker, Jr. and J. D. Johnson, J. Phys. A 18, L261 (1985)] to be nontrivial is proved rigorously. It is proved to satisfy all usual requirements of such a field theory, except rotational invariance. Currently known information is consistent with rotational invariance however. Most of the usual properties of other known Euclidean boson quantum field theories hold here, in a somewhat weakened form. Summability of the sufficiently strongly ultraviolet cutoff bare coupling constant perturbation series is proved as well as a nonzero radius of convergence for high-temperature expansions of the corresponding continuous-spin Ising model. The description of the theory by these two series methods is shown to be equivalent. The field theory is probably not asymptotically free.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.527009
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  • 6
    Electronic Resource
    Electronic Resource
    Carbon diffusion in undoped, n-type, and p-type GaAs (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 687-689 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of background doping, surface encapsulation, and As4 overpressure on carbon diffusion have been studied by annealing samples with 1000 A(ring) p-type carbon doping spikes grown within 1 μm layers of undoped (n−), Se-doped (n+), and Mg-doped (p+) GaAs. The layers were grown by low-pressure metalorganic chemical vapor deposition using CCl4 as the carbon doping source. Two different As4 overpressure conditions were investigated: (1) the equilibrium pAs4 over GaAs (no excess As), and (2) pAs4 ∼2.5 atm. For each As4 overpressure condition, both capless and Si3N4-capped samples of the n−-, n+-, and p+-GaAs crystals were annealed simultaneously (825 °C, 24 h). Secondary-ion mass spectroscopy was used to measure the atomic carbon depth profiles. The carbon diffusion coefficient is always low, but depends on the background doping, being highest in Mg-doped (p+) GaAs and lowest in Se-doped (n+) GaAs. The influence of surface encapsulation (Si3N4) and pAs4 on carbon diffusion is minimal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101822
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  • 7
    Electronic Resource
    Electronic Resource
    Impurity-induced layer disordering of high gap Iny(AlxGa1−x)1−yP heterostructures (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 1413-1415 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Data are presented showing the impurity-induced layer disordering (IILD), via low-temperature (600–675 °C) Zn diffusion, of In0.5(AlxGa1−x)0.5P quantum well heterostructures and an In0.5Al0.2Ga0.3P-GaAs heterojunction grown using metalorganic chemical vapor deposition. Secondary ion mass spectroscopy, transmission electron microscopy, and photoluminescence are used to confirm IILD, which occurs via atom intermixing on the column III site aided by column-III-atom interstitials. In addition, high-temperature anneals (800–850 °C) are performed on the same crystals to confirm the thermal stability of the heterointerfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99132
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  • 8
    Electronic Resource
    Electronic Resource
    "Oxide-free'' tip for scanning tunneling microscopy (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 305-307 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report a new tip for scanning tunneling microscopy and a tip repair procedure that allows one to reproducibly obtain atomic images of highly oriented pyrolytic graphite with previously inoperable tips. The tips are shown to be relatively oxide-free and highly resistant to oxidation. The tips are fabricated with graphite by two distinct methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98451
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  • 9
    Electronic Resource
    Electronic Resource
    Oriented high Tc superconductive layers on silver by devitrification of glasses formed in the Bi-Sr-Ca-Cu oxide system (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 371-373 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Highly oriented crystalline layers of Bi4(Sr,Ca)3Cu4O16+x high Tc superconductors were produced by the devitrification of aerosol suspensions of glasses prepared from the mixed oxides when the suspensions were brought into rapid contact with heated silver substrates. The best magnetic susceptibility signals, produced by superconductivity at 77 K, were obtained when the glass was rapidly heated to about 850 °C from room temperature. The deposited layers are composed of a nearly pure superconductive phase in the form of flat platelets up to several hundred microns in diameter that are oriented with the c axis normal to the substrate. The addition of a small amount of Pb to the glass lowers the optimum deposition temperature and improves the crystal morphology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101453
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  • 10
    Electronic Resource
    Electronic Resource
    Comparison of SiIII-SiV and SiIII-VIII diffusion models in III-V heterostructures lattice matched to GaAs (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 2211-2213 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The diffusion of SiIII-SiV neutral pairs versus the diffusion of SiIII-VIII complexes in III-V crystals is compared in the light of experimental data showing the effect of Si diffusion on self-diffusion of column III and column V lattice atoms. Secondary-ion mass spectroscopy is used to compare the enhanced diffusion of column III or column V atoms in several different Si-diffused heterostructures closely lattice matched to GaAs. Enhancement of the lattice-atom self-diffusion, via impurity diffusion, is found to occur predominantly on the column III lattice. Supporting the SiIII-VIII diffusion model, these data indicate that the main native defects accompanying the Si diffusion are column III vacancies, which diffuse directly on the column III sublattice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100284
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