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  • 1
    Electronic Resource
    Electronic Resource
    Interferometric determination of optical anisotropy in fibers 1- homogeneous fibers (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 929-932 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This article describes a method for the measurement of refractive indices and birefringence of fibers. It is used to overcome difficulties in measuring refractive indices of immersion liquids as well as the corrections for dispersion and temperatures. Two fibers are used for each measurement. One is of known refractive index and dispersion properties and the other is of unknown refractive index. A modified mathematical formula is used with a two-beam interference microscope. This technique is applied to two groups of fibers having different ranges of refractive indices. The first group contains seven different products of nylons and the second group contains five different products of polyesters. The calculated refractive indices using this method is compared with those obtained using the established method. Illustrations are given using microinterferograms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347334
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  • 2
    Electronic Resource
    Electronic Resource
    Interferometric determination of optical anisotropy in fibers III multilayer fibers (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 4480-4484 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Mathematical formulas are modified for the shape of two-beam interference fringes crossing a cylindrical multilayer fiber to determine the refractive indices and birefringence at the boundary of layers across the fiber diameter. An equation is also derived to calculate the parts of cross-sectional areas of the fiber layers. A polarizing interference microscope is used to determine the variation of refractive indices and birefringence at any point across the diameter of polyester and nylon fibers. Two fibers are used for each measurement. The first fiber is of known mean refractive index and dispersion properties. The other fiber is of unknown values of refractive indices of fiber layers. The calculations are carried out with both line and area methods using the derived mathematical formulas. Illustrations are given by microinterferograms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349081
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The nonlinear description of a plasma maser (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 2051-2057 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A plasma–microwave system was proposed by one of the authors for the production of microwave radiation. The device exploits the electromagnetic instabilities of nonequilibrium plasmas. During single-mode operation of the plasma maser, the resonant particles become trapped and cease to radiate before a substantial fraction of the energy available could be extracted from the plasma in the form of radiation. (This is not true for multimode operation. During multimode operation, the total energy available is distributed over a large number of resonant lines and the amplitudes of the various frequency components of the waves are not at all large enough to cause particle trapping and subsequently saturation. Thus, the linear theory remains valid until the anisotropy disappears due to radiation.) One should, therefore, consider the interaction of the bulk plasma with the nonresonant monochromatic electromagnetic wave in order to estimate the total energy transferred from the plasma to the wave. In the framework of the linear treatment, due to the resonant nature of the instability considered in previous work by one of the authors, the transfer of energy from the nonresonant plasma to the wave is zero. Consequently, the efficiency of the device during single-mode operation can only be evaluated after considering the nonlinear evolution of the plasma–microwave system. In this paper we describe in some details the nonlinear evolution of the plasma–wave system using a single particle analysis. The current density J is calculated using the second moment of the particle distribution function (evaluated using Liouville's theorem of conservation of phase space density along particle orbits), and the energy balance equation is solved numerically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346556
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  • 4
    Electronic Resource
    Electronic Resource
    Investigation of optical damage mechanisms in hafnia and silica thin films using pairs of subnanosecond laser pulses with variable time delay (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 1204-1208 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Optical damage thresholds of submicron-thick, electron beam deposited HfO2 and SiO2 films on BK-7 substrates have been measured by monitoring the emission of neutral constituents during excitation with time-delayed pairs of 70-ps laser pulses at a wavelength of 1064 nm. The dependence of the optical damage threshold on time delay provides evidence of the optical damage mechanism. For SiO2, linear absorption is the mechanism for energy deposition into the films by the laser beams. The data for HfO2 are less definitive, although linear absorption is the most likely damage mechanism. The behavior of the single-layer films is compared to multilayer HfO2-SiO2 high-reflector coatings, for which a "conditioning'' effect causes an increased optical damage threshold due to multiple pulse laser excitation at fluences below the single-pulse optical damage threshold.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351288
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  • 5
    Electronic Resource
    Electronic Resource
    Interferometric determination of optical anisotropy in fibers. II. Fibers with a skin-core structure (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 7231-7235 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The polarizing interference microscope with a modified method is used to determine the refractive indices and birefringence of both layers of fibers having a skin-core structure. This method is applied to nylon 6 and polyester fibers. Two fibers are used for each measurement. The first fiber is of known mean refractive index and dispersion properties. The other fiber is of unknown values of refractive indices of each layer of the fiber. This method can be used for fibers with regular or irregular cross sections. In the latter case the area enclosed under the interference fringe shift represents the optical path difference integrated across the fiber. The obtained results of refractive indices and birefringence are compared with those obtained from the normal method and found to be in good agreement. Illustrations are given by microinterferograms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347618
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Measurement of refractive indices of homogeneous fibers with regular or irregular transverse sections (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 2639-2642 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Seven fibers of different cross-sectional shape are studied interferometrically using multiple-beam Fizeau fringes. These fibers are of circular, rectangular, triangular, trilobal, elliptical, kidney, and dog-bone cross-sectional shapes. The areas enclosed under the interference fringe shift is considered to represent the optical path difference integrated across the fiber. This principal is applied to nylon 6 fibers of trilobal cross-sectional shape. The described method is suitable for the measurement of refractive indices of any fiber with regular or irregular transverse sections. Microinterferograms are given for illustration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346488
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  • 7
    Electronic Resource
    Electronic Resource
    Surface mobility of C60 on SiO2 (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 4855-4859 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The interaction of a collisionless beam of thermal C60 nanoclusters with a silicon dioxide surface has been investigated with modulated molecular beam-mass spectroscopic techniques. Analysis of the amplitude and phase lag of the desorbed C60 shows the interaction mechanism to involve the elementary steps of sticking, desorption, and long-range surface diffusion. Surface diffusion coefficients determined in this measurement indicate that surface C60 nanoclusters approach two-dimensional gas-like behavior. The sticking probability of C60 clusters on SiO2 is determined to be unity. The best fit desorption rate constant kd for C60 from SiO2 is 5×1010 exp(−23 kcal/mol/RT) in agreement with previous temperature programmed desorption experiments. The efficiencies of electron impact ionization of C60 to C60+ and C60++ is measured for electron energies from 10 to 105 eV for neutrals at 875 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466032
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Observation of C60 cage opening on Si(111)-(7×7) (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 150-152 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The "opening'' of C60 on Si(111)-(7×7) has been directly observed by scanning tunneling microscopy and correlated with Auger electron spectroscopy (AES) and temperature-programmed desorption spectroscopy. Isolated C60 clusters are observed on Si(111)-(7×7) after annealing the surface to 620 K. Annealing the surface to 1020 K causes the C60 cages to open and thereby cover more of the surface. Also evident is that the opened clusters agglomerate on the surface. The opening of the C60 cage is correlated with an increase in the amount of silicon—carbon bonding and with the increase in the carbon-to-silicon AES peak height ratio with increasing annealing temperature. The ratio increases since the opened cages cover more of the substrate silicon atoms, reducing AES emission from the substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110382
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  • 9
    Electronic Resource
    Electronic Resource
    Dynamics of the dissociative adsorption of hydrogen on nickel(100) (1985)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 89 (1985), S. 5381-5386 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100271a014
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Sublimation of Higher Fullerenes and Their Interaction with Silicon (100) Surface (1995)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 16736-16741 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100045a038
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