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  • 1
    Electronic Resource
    Electronic Resource
    Potassium-oxygen interactions on a ruthenium(001) surface (1992)
    s.l. : American Chemical Society
    Langmuir 8 (1992), S. 2461-2472 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00046a019
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  • 2
    Electronic Resource
    Electronic Resource
    Photoluminescence and structural characteristics of CdS nanoclusters synthesized by hydrothermal microemulsion (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 1059-1063 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Spherical and uniform CdS nanoclusters were synthesized by hydrothermal microemulsion. The reaction of Cd2+ ions with S2− ions generated from the decomposition of thioacetamide proceeded in water microdroplets. The mean diameter of the CdS nanoclusters can be varied from 20 to 80 nm by increasing the reaction temperature from 30 to 120 °C. XRD results indicate that the resulting CdS nanoclusters have a reduced and distorted hexagonal lattice compared to bulk materials. Two intense luminescence bands, i.e., green and red, were observed to coexist in the CdS nanoclusters. Their peak positions and relative intensities were found to be sensitive to the size and structure of nanoclusters. These emissions are attributed to surface defects (green emission) and the Cd–Cl composite vacancies (red emission). © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1335642
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  • 3
    Electronic Resource
    Electronic Resource
    Moisture diffusion along the TiN/SiO2 interface and in plasma-enhanced chemical vapor deposited SiO2 (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 3695-3698 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The diffusivity of moisture along the TiN/SiO2 interface has been determined by imaging the inward diffusion of 18O and 2D from isotopically labeled water using a secondary ion mass spectroscopy (SIMS) technique. The diffusivity, at room temperature, of the 18O and 2D labeled species along the interface are indistinguishable and have a value of 6.0±2.0×10−13 cm2/s, four orders of magnitude faster than bulk diffusivity of the same species in the plasma-enhanced chemical vapor deposition silica, also determined by SIMS. From 8 to 90 °C, the activation energies for interface and bulk diffusivities of the 2D labeled species are found to be 0.21 and 0.74 eV, respectively. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1289481
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  • 4
    Electronic Resource
    Electronic Resource
    Resonant optical nonlinearity of fullerenes in free-standing polymethyl methacrylate films (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 3669-3672 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have prepared films of polymethyl methacrylate in which fullerenes (a mixture of C60 and C70) are uniformly embedded. By performing both degenerate four-wave mixing experiments and irradiance-dependent transmission measurements with nanosecond laser pulses of 608-nm wavelength, the third-order nonlinear optical susceptibility of these films is determined to be of the order of 10−10 esu. This susceptibility is dominated by its imaginary part. Excited-state absorption is the main mechanism responsible for the observed nonlinear susceptibility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354508
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  • 5
    Electronic Resource
    Electronic Resource
    Scaling of mean temperature dissipation rate (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 12 (2000), S. 3090-3093 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Expressions for Cε and Cεθ, the dimensionless mean energy and temperature dissipation rates, can be reasonably reconciled with measured and numerical data at small to moderate Rλ only if the Kolmogorov constant and more especially the Obukhov–Corrsin constant are assumed to depend on the flow and the Reynolds number. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1312851
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  • 6
    Electronic Resource
    Electronic Resource
    Second-order temperature and velocity structure functions: Reynolds number dependence (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 12 (2000), S. 1509-1517 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An interpolation relation is used to fit second-order moments of temperature and velocity fluctuation increments which have been measured in three types of flows (decaying grid turbulence, cylinder wake, and circular jet) for values of the Taylor microscale Reynolds number Rλ in the range 30 (grid turbulence) to about 500 (jet). Several checks confirm the analytical framework underpinning the fit. The magnitude of the resulting scaling exponents increases with Rλ, the longitudinal one being first to asymptote to a constant value. The scaling exponent for the temperature increment is generally smaller than that for the longitudinal velocity increment but larger than that for the transverse velocity increment when Rλ≤300. For Rλ〉300, the magnitude of the scaling exponents of the temperature and transverse velocity increments are nearly equal. Within the framework of small-scale intermittency, the magnitude of the Obukhov–Corrsin "constant" increases at small Rλ in similar manner to that of the longitudinal and transverse velocity Kolmogorov constants. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870399
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  • 7
    Electronic Resource
    Electronic Resource
    Simulation of ionic diffusion in solid polymer electrolytes with correlated chain motion (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 2001-2003 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Based on the dynamic bond percolation model, we try to regenerate the non-Arrhenius temperature dependence for the ionic conductivity of the polyethylene oxide type polymer electrolytes by considering continuous, correlated motions of the host polymer matrix. To simulate the chain movements, periodic rotations of bond groups of several sizes were introduced into a two-dimensional square lattice. Although the Arrhenius temperature dependence of the rotation frequencies were assumed such that the rotation periods ∝ exp(E/kT), where E increases with the bond group size, the resulting logarithmic diffusivity plotted against reciprocal temperature produces a convex curvature—the typical feature observed by the experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465261
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  • 8
    Electronic Resource
    Electronic Resource
    In search of zonal flows using cross-bispectrum analysis in the boundary plasma of the Hefei Tokamak-7 (2002)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 9 (2002), S. 150-154 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Langmuir probes have been used to measure the electrostatic Reynolds stress and the floating potential fluctuation in the boundary plasma of the Hefei Tokamak-7 (HT-7) [J. Li, B. N. Wan, and J. S. Mao, Plasma Phys. Controlled Fusion 42, 135 (2000)]. The cross bispectrum of 〈V˜rV˜θφ˜f〉 indicates the existence of difference-frequency nonlinear phase coupling and the generation of fluctuations near the geodesic acoustic mode frequency. The inverse cascade process might be linked to the generation of zonal flows by small-scale electrostatic drift-wave turbulence. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1419255
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  • 9
    Electronic Resource
    Electronic Resource
    Photochemistry of adsorbed molecules. IX. Ultraviolet photodissociation and photoreaction of HBr on LiF(001) (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 1361-1377 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The dynamics of the UV photochemistry of HBr on LiF(001) has been studied by angle-resolved time-of-flight mass spectrometry in ultra-high vacuum. Single-photon photodissociation of adsorbed HBr at 193 nm resulted in photofragment translational energy distributions that differed from those produced in the gas-phase photolysis. Angular distributions of the fast H-atom photofragments peaked at 55±5° to the surface normal, consistent with a preferentially oriented adsorbate geometry. The angular distribution of atomic H obtained from photodissociation of HBr(ad) using polarized light indicated that a substantial fraction of the H atoms collided with the surface before leaving it. Two types of photoreactions in the adsorbed state were observed. Molecular hydrogen was formed in the photoinitiated abstraction reaction, H+HBr(ad)→H2(g)+Br, and its markedly non-Boltzmann translational energy distribution was found to have less energy than would be consistent with gas-phase experiments (performed elsewhere). Photoproducts from the bimolecular reaction 2HX(ad)→H2+X2, X=Cl, Br were also observed in the present study. This photoreaction, which did not depend on prior photodissociation of HX(ad), is thought to proceed through electronic excitation of an HX dimer in the adsorbed state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461118
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  • 10
    Electronic Resource
    Electronic Resource
    Layer resolved spectroscopy of potassium adsorbed on a Ru(001) surface: Photoemission and thermal desorption study (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 5786-5792 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: High-resolution photoemission spectroscopy and thermal desorption were used to study the coverage dependence of the K 3p3/2,1/2 core levels of K overlayers on Ru(001). Three doublets were observed to evolve sequentially and to shift to higher binding energy with increasing coverage of potassium. The doublets were assigned to photoemission from the interface (first layer), "bulk'' (second layer), and surface (third layer). Spin–orbit splitting was observed for the first time in the condensed potassium phase by photoemission. The results are discussed in terms of the equivalent core approximation using a Born–Haber cycle. In the thermal desorption data three coverage regimes can be distinguished: a first layer desorbing with first-order kinetics and a strongly decreasing heat of adsorption (EA =2.80–0.87 eV); a second layer with zero-order desorption kinetics and EA =0.78 eV; a third layer and multilayers with the same kinetic order but with EA increasing from 0.78 to 0.93 eV, which is close to the heat of sublimation of potassium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457531
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