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  • American Institute of Physics (AIP)  (31)
  • American Association for the Advancement of Science  (23)
  • American Association for the Advancement of Science (AAAS)  (19)
  • 1985-1989  (73)
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  • 1
    Electronic Resource
    Electronic Resource
    Hydrogenated amorphous carbon dielectric coatings for magneto-optic data storage media (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 4646-4650 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thin films of hydrogenated amorphous carbon (a-C:H) have been evaluated as quarter-wave, antireflection dielectric coatings for application in magneto-optic data storage media. The films, which are produced by plasma deposition from methane, have low optical absorption at 830 nm wavelength, high refractive index (n≈2.1), and provide enhancement of the polar Kerr rotation (θk) when used in conjunction with rare-earth–transition-metal (RE–TM), TbFe, or TbFeCo alloys. The chemical stability, inertness, and homogeneity of the carbon films makes them effective diffusion barriers to oxygen or water vapor and thus provides excellent protection against environmental oxidation of the RE–TM layer. Dynamic disk performance data show improved write sensitivity of the media when used with a-C:H dielectric layers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341244
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  • 2
    Electronic Resource
    Electronic Resource
    Computer modeling of negative ion beam formation (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 6210-6226 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Sources of root-mean-square (RMS) emittance growth are described for negative ion extractors in both volume and surface negative ion sources and plasma low-energy beam transport systems. For surface negative ion sources of the Lawrence Berkeley Laboratory or Los Alamos National Laboratory [on Los Alamos Meson Particle Facility (LAMPF)], attention is paid to the nonlinear transverse emittance growth mechanism of the beam/warm plasma interaction. In some cases this is a large effect. In addition, non-normal sheath fields at a convertor are examined as a source of emittance growth. For volume sources, attention is paid to aberration production due to field penetration from the extractor, RMS emittance growth enhancement by a negatively biased plasma extraction electrode, and emittance growth caused by transverse extraction across a magnetic field. For both volume and surface sources, RMS emittance growth due to nonlinear aberration at the plasma extraction electrode is analyzed. Time-dependent contributions to emittance growth are also examined. Nonlinear saturation of ion acoustic waves caused by ion extraction from a warm plasma and beam transversal through a plasma are studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342078
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  • 3
    Electronic Resource
    Electronic Resource
    NMR and NQR studies of copper oxide superconductors (invited) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 6081-6086 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: 63,65Cu NMR and NQR measurements reveal remarkably different electronic character at the Cu(1) chain and Cu(2) plane sites in YBa2Cu3O7.0. In the normal state, spin-lattice relaxation rates at both sites are strongly enhanced relative to estimated d-band Korringa (T1) rates, but have sharply different temperature dependencies. Moreover, T1 anisotropy is greater than an enhanced Korringa model can account for. Below Tc, the temperature dependencies reveal significantly different spectra for quasiparticle excitation at the two sites with the strongest apparent energy gap occurring for the planar Cu(2) sites. At reduced oxygen content (YBa2Cu3O6.7) the relaxation at the Cu(1) sites is only slightly (∼30%) less than observed for YBa2Cu3O7.0 while the rates for the resonance at the frequency of the Cu(2) sites in YBa2Cu3O7.0 exhibit a large (∼2000 ×) decrease for a minority of planar Cu(2) sites indicates that these sites are electronically inactive. NMR shift measurements are used to analyze the susceptibility of YBa2Cu3O7.0 and obtain an upper limit for the electronic density of states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342515
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  • 4
    Electronic Resource
    Electronic Resource
    An in situ study of dissolution and swelling behavior of poly-(methyl methacrylate) thin films in solvent/nonsolvent binary mixtures (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 682-688 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A single-element rotating-polarizer ellipsometer (psi-meter) was used for in situ characterization of the thermodynamic and kinetic behavior of poly-(methyl methacrylate), PMMA, thin films (1.2 μm) in solvent/nonsolvent binary mixtures of methyl ethyl ketone/isopropanol (MEK/IPA) and methyl isobutyl ketone/methanol (MIBK/MeOH). Thermodynamic effects were inferred from equilibrium behavior by the degree of swelling and polymer-solvent solubility. A sharp transition between complete solubility and almost total insolubility was observed in a narrow concentration range near 50:50 (by volume) solvent/nonsolvent for both MEK/IPA and MIBK/MeOH. In the insoluble regime, the polymer was found to swell up to three times the initial thickness. At 50:50 MEK/IPA, a temperature decrease from 24.8 to 18.4 °C caused a change from complete dissolution to combined swelling/dissolution behavior and rendered the PMMA film only 68% soluble. Kinetic effects were determined by dissolution and penetration rate measurements. A constant penetration velocity was observed for almost all compositions for both binary solvent mixtures with Case II transport assumptions providing good agreement with experimental results. For MEK/IPA, penetration rates increased with increasing MEK concentration. For MIBK/MeOH, however, a maximum was observed at 60:40 MIBK/MeOH.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339742
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  • 5
    Electronic Resource
    Electronic Resource
    The equation of state of dense argon: A comparison of shock and static studies (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 1028-1033 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: New static high pressure measurements for room temperature solid argon to 800 kbar are in excellent agreement with one predicted from a theoretical reduction of shock wave data. The results demonstrate the agreement between shock and static techniques even in cases where shock temperatures are extremely high and a large thermal correction is required to reduce the Hugoniot to an isotherm. The results suggest that solid argon may provide a useful static pressure standard up to about 3–4 Mbar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451346
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  • 6
    Electronic Resource
    Electronic Resource
    Ionization and fragmentation of Bi microclusters by electron impact (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 1423-1432 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Results are presented for an electron impact study of ionization and fragmentation effects in Bi microclusters ranging in size from 1 to 63 atoms. Using results from both high-vacuum and gas condensation cluster sources, energy thresholds for the fragmentation of clusters larger than 20 atoms or so are identified and found to lie 5±1 eV above the corresponding ionization thresholds. The experimental distribution of net changes in intensity from fragmentation, for clusters from 3 to 63 atoms, has been fitted with a simple model in which it was necessary to assume (a) a strong peak in the fragmentation probability in the vicinity of ∼30 atoms and (b) a probability of ∼80% that the minor fragment retains the positive charge, contrary to expectations based on final energies. Ionization potentials are given for clusters up to n=38 atoms. These are found to show rough agreement with the metallic sphere model for n〉5 atoms, i.e., behavior intermediate between that of simple metals and semiconductors. The great majority of clusters studied also exhibit second thresholds in their ionization curves, from 1.2 to 3.0 eV above the first onset. The interval between thresholds becomes nearly constant for n〉10 atoms. We tentatively attribute this effect to structure in the filled electron states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453271
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  • 7
    Electronic Resource
    Electronic Resource
    Band broadening of CH2 vibrations in the Raman spectra of polymethylene chains (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 3827-3839 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The isotropic and anisotropic linewidths of methylene vibrations in a homologous series of alkanes of increasing chain length have been measured in the liquid state as a function of temperature. The bandwidths of the CH2 symmetric stretching modes, which are in Fermi resonance with overtones of the CH2 bending vibrations, are temperature insensitive over a 200 K interval; this is best explained in terms of a vibrational dephasing mechanism (inhomogeneous broadening) for these modes. In contrast, for the bending and antisymmetric stretching vibrations, significant band broadening occurs over this same temperature interval. In addition, for these modes, both the absolute value of the bandwidth and the relative rate of increase of the bandwidth with increasing temperature, decrease with increasing chain length. These observations are consistent with a reorientational broadening mechanism as the principal bandwidth contribution for these vibrations. Hindered end-over-end rotation of the molecules, which contributes to the band broadening for very low molecular weight alkanes, rapidly becomes too slow to be observable on the time scale of the Raman experiment for the higher molecular weight alkanes and polyethylene. For longer chain lengths, torsional backbone motions coupled to the high frequency antisymmetric stretching modes can account for the breadth of the bands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450903
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  • 8
    Electronic Resource
    Electronic Resource
    On the Compton defect (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 303-307 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Simple analytical formulas are given for Compton profiles obtained from an exact first Born approximation for K, L, and M subshells. Compton profile asymmetries and Compton defects are investigated and compared with experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451656
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  • 9
    Electronic Resource
    Electronic Resource
    Photodissociation of chlorine isocyanate (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 1317-1322 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Gaseous ClNCO exhibits a continuous ultraviolet absorption feature peaked near 250 nm. Photolysis of this compound at 249 nm produces bright blue emission identified as the A 2Σ+→X 2Π transition in NCO. The excited NCO arises from a collisional process in which N(2D) atoms, produced directly by the photodissociation, react with the parent ClNCO. The rate constant for this process is k=(2.1±0.2)×10−11 cm3 s−1. From production of N(2D) by the 249 nm photolysis, the heat of formation of gaseous ClNCO is inferred to be ΔHf(ClNCO)≥52.9 kcal mol−1. ClNCO is metastable with respect to the ground electronic states of NCl and CO by 8.2 kcal mol−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448962
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  • 10
    Electronic Resource
    Electronic Resource
    Quadratic configuration interaction: Reply to comment by Paldus, Cizek, and Jeziorski (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 4635-4636 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456607
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