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  • American Institute of Physics (AIP)  (36)
  • Institute of Physics  (22)
  • Wiley-Blackwell  (14)
  • National Academy of Sciences  (13)
  • 2005-2009
  • 1990-1994  (85)
  • 1993  (85)
  • 1
    Electronic Resource
    Electronic Resource
    Thermal stability of internal electric field and polarization distribution in blend of polyvinylidene fluoride and polymethylmethacrylate (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 3366-3372 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is confirmed that a melt-quenched and annealed blend of 80 wt % polyvinylidene fluoride and 20 wt % polymethylmethacrylate has the β-crystal form of PVDF with optical clarity and other properties that are desirable for a host material in a guest-host system where the guest is an optically nonlinear dye that is orientationally stabilized by the strong internal electric field of a poled ferroelectric. Combined measurements, in such a blend, of the internal electric field Ei, the pyroelectric coefficient Cpyro, and the polarization distribution after electrically poling and subsequently thermally aging for 2 h intervals at temperatures up to 120 °C are reported. Ei and Cpyro increase with increasing poling field Ep. Ei was found to be as large as three times Ep. An unexpected thermal stability of Ei was observed at annealing temperatures above the glass transition temperature of 60 °C up to 100 °C when significant loss of Cpyro was measured. Thermal pulse results yield polarization distributions that may be attributed in part to dipolar polarization and in part to space charge. The prolonged thermal stability of Ei is ascribed to space charge that does not contribute to Cpyro. The poled blend shows second-harmonic generation with a nonlinear coefficient d33 of around 1 pm/V (9×10−9 esu).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354562
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  • 2
    Electronic Resource
    Electronic Resource
    Excimer laser ablation of polyimide-doped poly(tetrafluoroethylene) at 248 and 308 nm (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 5972-5980 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experimental data on the 248 and 308 nm wavelength excimer laser ablation at poly(tetrafluoroethylene) doped with polymide (PI) are reported for a range of fluences and dopant concentrations. Threshold fluences were determined and a correlation was obtained between the dopant concentration and the threshold fluence. The threshold fluences and the limiting etch rates at high fluences decreased with increasing dopant concentration, and there is a minimum dopant concentration below which there is no ablation at both of the wavelengths. The side wall taper of the ablated holes increased with increasing dopant concentration. At subthreshold fluences, the polymer surface was modified with selective removal of PI from the polymer blend. The etch rates have been modeled using a two parameter thermal model to describe the etching process. The parameters obtained by fitting the data are qualitatively correlated to the dopant concentration and the measured limiting etch rates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355210
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  • 3
    Electronic Resource
    Electronic Resource
    Morphological instability in epitaxially strained dislocation-free solid films: Linear stability theory (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 4955-4970 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The morphological instability of a growing epitaxially strained dislocation-free solid film is analyzed. An evolution equation for the film surface is derived in the dilute limit of vacancies based on surface diffusion driven by a stress-dependent chemical potential. From the time-dependent linear stability problem the conditions for which a growing film is unstable are determined. It is found that the instability is driven by the lattice mismatch between the film and the substrate; however, low temperatures as well as elastically stiff substrates are stabilizing influences. The results also reveal that the critical film thickness for instability depends on the growth rate of the film itself. Detailed comparison with experimental observations indicates that the instability described exhibits many of the observed features of the onset of the "island instability.''
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353815
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  • 4
    Electronic Resource
    Electronic Resource
    Multilevel amplified spontaneous emission in I2 (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 2672-2677 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the results of a study of amplified spontaneous emission (ASE) in the I2(B→X) system. For many (v',v‘) bands, several J'→J‘ transitions contribute to the ASE in a cooperative manner. We present spectroscopic and kinetic data that contrast this cooperative stimulated emission to the emission in previously reported optically pumped lasers. Transitions that involve several cooperatively emitting levels produce efficient conversion of the pump laser to near-infrared output.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353063
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  • 5
    Electronic Resource
    Electronic Resource
    Controlled p- and n-type doping of homo- and heteroepitaxially grown InSb (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 6686-6690 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The p- and n-type doping, with Be and Si, respectively, of InSb grown on InSb and GaAs substrates using molecular-beam epitaxy was investigated. Using secondary-ion-mass spectrometry, an anomalous migration of Be toward the surface was observed for growth on InSb substrates when the substrate temperature exceeded 340 °C. This migration was not observed for Be-doped InSb layers grown on GaAs substrates. This redistribution of dopants was also not observed for Si-doped InSb layers. The doping efficiency of Be in InSb was approximately one-half that measured for Be in GaAs. For the doping efficiency of Si in InSb to reach that for Si in GaAs, the substrate temperature had to be maintained at ≤340 °C during growth. Using the low-temperature growth technique, Si delta-doped structures were grown which demonstrated two-dimensional electron gas behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355111
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  • 6
    Electronic Resource
    Electronic Resource
    Propagation coefficient in a superconducting asymmetrical parallel-plate transmission line with a buffer layer (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 4494-4499 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A sinusoidal wave solution is found for a superconducting asymmetrical parallel-plate transmission line with a buffer layer, by using Maxwell's and London's equations, the two-fluid model, and the classical skin effect for the normal component of the current. Expressions for phase velocity and attenuation coefficient of the wave are derived. Values for the attenuation coefficient are computed for various combinations of material properties, and losses in the buffer layer are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352790
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  • 7
    Electronic Resource
    Electronic Resource
    The metal-particle/insulating oil system: An ideal electrorheological fluid (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 680-683 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electrorheological (ER) properties of a model system consisting of oxidized metal particles in an insulating oil are analyzed. It is suggested that previous dc experiments on such systems have failed to reveal strong ER activity because of conductivity effects. Recent experiments by Inoue at 50 Hz excitation appear to have nearly obtained the ultimate strength of the metal-particle system studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353351
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  • 8
    Electronic Resource
    Electronic Resource
    Superselectivity and solvation forces of a two component fluid adsorbed in slit micropores (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 9890-9898 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We use the grand canonical Monte Carlo simulation technique to calculate adsorption of mixtures in molecularly narrow slit pores immersed in a two-component bath of spherical molecules that are different in size. The composition of the pore fluid oscillates strongly with the pore width. The oscillations reflect the differing ability of each molecule to pack as layers in the pore. Even in pores wide enough to admit both components, this difference in packing ability leads to a shut-out of the smaller component. Trends in the calculated solvation force agree with both experiment and theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465473
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  • 9
    Electronic Resource
    Electronic Resource
    Hierarchical analysis of molecular spectra (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 2614-2641 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A method of characterizing molecular spectra is proposed here. Hierarchical trees are generated from molecular spectra by following the branching of peaks as resolution is changed continuously. The trees are analyzed using several techniques developed in the classification and multivariate analysis literature. The information obtained from these techniques includes (1) dimensionality of geometrical representations of the trees; (2) clustering statistics; and (3) number of distinct time scales inherent in the spectra. Several model spectra are studied to establish the utility of the hierarchical analysis and a portion of a vibronic spectrum of NO2 is also investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464143
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  • 10
    Electronic Resource
    Electronic Resource
    State specific reactions of Ba(1S0) and Ba(1D2) with water and methanol (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 9595-9609 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The reactions of Ba(6s2 1S0) and Ba(6s5d 1D2) with water and methanol were studied under single collision conditions using crossed molecular beams. Reaction of ground state Ba(1S)+H2O led to dominant formation of BaO+H2 at all collision energies studied (12–30 kcal/mol). Although the reaction Ba(1S)+H2O→BaOH+H could also be observed at collision energies above the endoergicity of the reaction (13 kcal/mol), it remained a minor channel even at the highest collision energy. Electronic excitation of the Ba atom reactant to the metastable 1D2 state led to a large enhancement in reactivity, but the products were BaOH+H rather than BaO+H2. The dominance of BaO+H2 from ground state Ba(1S) even at collision energies nearly equal to the Ba(1D) excitation energy of 11 395 cm−1 (∼32 kcal/mol) indicates that the observed reaction state specificity results from participation of different potential energy surfaces for reactions of ground and excited state atoms. Collisions of Ba(1S) and Ba(1D) with methanol led only to formation of BaOCH3+H. We observed no BaOH+CH3 or BaO+CH4, despite the fact that they are the more thermodynamically favorable channels. Although reactivity with methanol was strongly enhanced by electronic excitation of the incident Ba atom, no reaction was observed from Ba(1S) or Ba(1D)+dimethyl ether (CH3OCH3). These observations strongly suggest that the reactions leading to radical formation involve H-atom migration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464390
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