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  • 1
    Electronic Resource
    Electronic Resource
    An electromagnetic trapped-particle sideband instability (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 3444-3446 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The sideband instability of a large-amplitude electromagnetic wave that traps electrons near the cyclotron resonance in a magnetized plasma is analyzed. The wave-trapped particles produce a weak instability. The growth rate and the criterion for the instability to exceed the threshold determined by collisional damping of the sidebands are given. This instability will have little consequence for the parameters expected in the microwave tokamak experiment at Lawrence Livermore National Laboratory [Proceedings of the 14th Annual Conference on Plasma Physics, St. Andrews, Scotland, 1987 (Pergamon, London, 1988), Paper No. 25].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866910
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  • 2
    Electronic Resource
    Electronic Resource
    Erratum: "An electromagnetic trapped-particle sideband instability'' [Phys. Fluids 31, 3444 (1988)] (1990)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 2 (1990), S. 682-682 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859586
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  • 3
    Electronic Resource
    Electronic Resource
    Asymmetry factors for randomly oriented infinite cylinders (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 1135-1140 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A method is presented for obtaining optical parameters that are relevant to problems of radiative transfer in such fields as polyester fiber insulation and the passage of radiation through aerosol clouds. The concept of the asymmetry factor is generalized to include nonspherical particles in order to calculate the ratio of the power of radiated light into the forward direction to the power of backscattering light. The geometry for scattering from an infinite cylinder randomly oriented is discussed and related to the problem of identifying the forward and backward directions. This geometry is used to calculate the asymmetry factor versus the angle which the cylinder axis makes with the direction of incidence. The asymmetry factor is also plotted as a function of the size parameter of the cylinder for random orientations of the cylinder.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336127
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  • 4
    Electronic Resource
    Electronic Resource
    Double scattering by randomly oriented long cylinders (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 698-703 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Double scattering lidar events involving long cylindrical particles are discussed. The scatterers are allowed to be randomly oriented and the geometry required in the scattering solution is described in detail. The geometry is general, made to be applicable to any type of particle for which the single scattering matrix is provided, relative to the main axis of the scatterer. Results of the double scattering calculations are presented for the penetration of the lidar light into clouds of different optical depth τ (τ≤0.5).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334714
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  • 5
    Electronic Resource
    Electronic Resource
    Scattering of linearly polarized light from randomly oriented cylinders and spheroids (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 3322-3327 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Shifrin perturbation theory is applied to the scattering of light from finite cylinders and spheroids, and a procedure is described for averaging over the possible orientations of the symmetry axes of these various target shapes. The possible axis orientations of very long cylinders is limited by the conical shape of the scattering patterns, and the manner of taking this into account in the averaging process is detailed. It is found that the scattering intensities for the scattering of light from randomly oriented long cylinders, with aspect ratios (length/diameter) less than about 200, show differences compared with infinite cylinders of the same radius and dielectric constant (m=1.5). This is especially true for high and low scattering angles and when the plane of linear polarization is changed by the scattering. Moreover, the scattering intensities for the scattering of light from randomly oriented short cylinders and spheroids, with aspect ratios ranging from 0.1 to 10 and the same volume, show significant differences when the plane of polarization is changed by the scattering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335792
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  • 6
    Electronic Resource
    Electronic Resource
    Viscosity of dilute polyelectrolyte solutions: Temperature dependence (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 9062-9068 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The reduced specific viscosity of fully sulfonated sodium neutralized polystyrene under "free salt'' conditions was investigated as a function of temperature. It was found that the position of the maxima is strongly dependent on temperature. Small temperature changes (ΔT=20 K) introduce shifts of two orders of magnitude in the polyelectrolyte concentration at which the maximum appear. At a given temperature Cpmax is linearly dependent on molecular weight, the slope of the linear plot is temperature dependent increasing with temperature. The value of Cp at the maximum increases linearly with concentrations of externally added salt at all temperatures and molecular weights. At a given molecular weight, the logarithm of Cpmax is inversely dependent on temperature. The activation energy was calculated and found to be independent of the molecular weight of the polyelectrolyte. The dependence of the reduced specific viscosity on normalized polyelectrolyte concentration (Cp/Cpmax) resulted in one "master curve'' for all temperatures at a given molecular weight. Below the maximum, at lower polyelectrolyte concentration, a linear dependence of ηsp/Cp on Cp was obtained even for salt-free solutions. The apparent intrinsic viscosity and the Huggins coefficient were calculated, as it is done for noncharged polymers in the linear regime. High values of apparent intrinsic viscosity and the Huggins coefficient were obtained. The high measured values cannot be explained by hydrodynamic contribution of fully stretched molecules, indicating that even at extremely high dilutions the main contribution is the one of long range interactions (Culombic or others). The dependence of the apparent intrinsic viscosity on molecular weight was established. These measurements could be performed thanks to the availability of the apparatus developed by us which makes possible accurate measurements of the shear viscosity of low ionic strength, dilute polyelectrolyte solutions, down to polymer concentrations below one part per million.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459197
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  • 7
    Electronic Resource
    Electronic Resource
    The rotational spectrum and structure of chlorine peroxide (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 6588-6597 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The products of the ClO self-reaction have been studied in a flowing chemical reactor using submillimeter wave spectroscopy. The complete spectrum between 415 to 435 GHz has been measured as well as selected transitions in the range 285 to 415 GHz. The major products have been identified as the ClO dimer (Cl2O2) and chlorine dioxide (OClO). The observed rotational b-type spectra of the most abundant isotopic species35 ClOO35Cl and 37ClOO35Cl have been analyzed. The observed nuclear spin statistics for the main species, the relative abundance of the lesser species, and the structure determination demonstrate unambigiously that the ClO dimer must possess identical chlorine atoms in a peroxide structure. The rotational constants as well as a complete set of quartic centrifugal distortion constants have been determined. Structural parameters for the vibronic ground state have been calculated: rOO=142.59(21) pm, rClO=170.44(4) pm, (angle)ClOO=110.07(1)° and dihedral angle=81.03(1)°. Rotational transitions in the first excited torsional state have been measured and analyzed for the isotopic species 35,35 and 35,37. An effective molecular structure for the first torsional excited state has been calculated. A torsional frequency has been derived from relative intensity measurements and the cis and the trans barrier heights estimated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457377
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  • 8
    Electronic Resource
    Electronic Resource
    Adsorption of oxygen molecule in NaA zeolite: Isotherms and infrared measurements (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 2649-2655 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Isotherm and infrared induced band of O2 have been studied in the temperature range 93–193 K. At low temperature and low coverage, two components of the fundamental vibrational band appear on both sides of the gas frequency. Their intensities with respect to T and to the number of adsorbed molecules have been measured in order to understand the interaction of O2 with NaA zeolite. The frequency shift of each component has been related to the orientation of the molecule, from considerations about the interaction potential.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456974
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  • 9
    Electronic Resource
    Electronic Resource
    Critical wetting in two-component polymer blends (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 5749-5755 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We derive the free energy of a bulk two-component polymer blend in the presence of a planar surface, and use these results to map out the region of critical wetting in parameter space. Unlike previous investigations of wetting, our free energy has terms containing gradients of the composition profile at the surface, and we find that these terms have important consequences for critical wetting. In particular, the single gradient term causes the region of parameter space in which it is possible to find critical wetting to be greatly reduced. Although, as discussed in our concluding remarks, we find that the random phase approximation fails for a polymer blend near a surface, our conclusions concerning critical wetting are valid for a free energy which includes gradient terms of the general type considered here.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456383
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  • 10
    Electronic Resource
    Electronic Resource
    Direct observation of preferential bond fission by excitation of a vibrational fundamental: Photodissociation of HOD (0,0,1) (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 2146-2148 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The 193 nm photodissociation of individual rotational levels of HOD molecules excited with one quantum of O–H stretching vibrational energy is described. Stimulated Raman excitation and coherent anti-Stokes Raman scattering are used to prepare and detect, respectively, the (0,0,1) vibrationally excited HOD. The OD and OH fragments are detected by laser induced fluorescence. The photodissociation of the HOD (0,0,1) molecules yields at least three times more OD than OH.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459040
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