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  • 1
    Electronic Resource
    Electronic Resource
    Microwave dielectric measurements of zirconia-alumina ceramic composites: A test of the Clausius–Mossotti mixture equations (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 7648-7650 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The complex dielectric properties of a series of zirconia-alumina ceramic composites are characterized in the 15–140 GHz frequency range. The measured dielectric constants are compared to various forms of mixture equations derived from local field considerations, and to theoretical relations that define bounds on the range of possible values. The closest agreement is obtained with the effective medium theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349700
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic properties of Fe/Cr and Fe/Cu superlattices (abstract) : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4801-4801 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Both the static and dynamic magnetic properties of sputtered Fe/Cr and Fe/Cu superlattices are compared. The static magnetization is measured by vibrating sample and SQUID magnetometry as well as conversion electron Mössbauer spectroscopy. The spin-wave spectra are measured by Brillouin light scattering (BLS). Although the structure of these two systems as determined by x-ray diffraction are similar, the magnetic properties differ greatly. In Fe/Cr, the Fe layers couple antiferromagnetically (AF), which can be correlated with an enhanced magnetoresistance. Both the strength of AF coupling and the size of the magnetoresistance are found to have a maximum value for Cr thicknesses of 11 A(ring) and increase with decreasing Fe thickness. Broad spin-wave spectra are observed by BLS and there is little indication of surface anisotropy. In contrast, Fe/Cu shows no indication of AF coupling of the Fe and a perpendicular surface anisotropy is observed. Very well-resolved spin-wave modes showing the band structure expected for a ferromagnetically coupled magnetic superlattice are observed in the BLS spectra. The relationship between the interface structure and the varying magnetic properties will be discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348234
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  • 3
    Electronic Resource
    Electronic Resource
    A pulsed supersonic entrainment reactor for the rational preparation of cold ionic complexes (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 4431-4434 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe an ion source for the efficient preparation of cold ion-molecule complexes, X−⋅M. The method relies on condensation of solvent molecules, M, onto argon-solvated ions, X−⋅Arm, where the X−⋅Arm species are formed in a primary expansion and the molecular partner, M, is interfaced to this flow in the hydrodynamic region by supersonic entrainment. This hybrid "supersonic afterglow" reactor provides a clean synthetic approach for both bare and argon-solvated complexes, where the latter are particularly useful since their structures can be characterized by "nanomatrix" infrared predissociation spectroscopy. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1326931
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  • 4
    Electronic Resource
    Electronic Resource
    Surface electromagnetic wave excitation on one-dimensional photonic band-gap arrays (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 1800-1802 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experiments are described on the prism-coupled excitation of surface electromagnetic waves in one-dimensional photonic band-gap arrays. The low loss of photonic band-gap materials leads to narrow angular reflectivity resonances and high surface fields. These attributes, coupled with the ability to engineer the optical properties of photonic band-gap arrays, suggest these materials as powerful replacements for metal films in many applications that make use of surface-plasmon resonance. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123090
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  • 5
    Electronic Resource
    Electronic Resource
    Microwave diffraction and interference in reflection using transient radiation from optoelectronically pulsed antennas (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 1958-1960 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Broadband (15–130 GHz) microwave interference and diffraction are demonstrated in a reflection configuration using transient radiation from optoelectronically pulsed antennas. The measured complex reflection function of Fabry–Perot interferometers and diffraction from amplitude gratings are presented. The effectiveness of the technique for quantifying the scattering from general three-dimensional objects is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103995
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  • 6
    Electronic Resource
    Electronic Resource
    Argon predissociation and electron autodetachment spectroscopy of size-selected CH3NO2−⋅Arn clusters (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 10718-10723 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Photodetachment spectra of CH3NO2−⋅Arn clusters in the mid-IR are dominated by three strong resonances. These are assigned to autodetaching (AD) C–H stretching vibrational transitions in the valence (as opposed to dipole-bound) form of the molecular anion on the basis of a H/D isotopic substitution study and their solvation dependence. The AD resonances disappear promptly upon addition of the third argon atom, while the resonant structure appears in the action spectrum for formation of CH3NO2− photoproducts for n≥2. The strong argon solvation dependence of the photoproducts is traced to the rapidly changing endoergicity of the electron loss channel due to the differential solvation behavior of the valence anion relative to the neutral. We discuss a statistical limit for this competition, and introduce an intramolecular vibrational energy redistribution mediated AD mechanism unique to polyatomic anions. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1418251
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