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  • 1990-1994  (172)
  • 1980-1984  (147)
  • 1960-1964  (47)
  • 1930-1934  (13)
  • 1
    Electronic Resource
    Electronic Resource
    Transient electrochemical techniques in liquid chromatography with microprocessor-based instrumentation (1982)
    s.l. : American Chemical Society
    Analytical chemistry 54 (1982), S. 1702-1705 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00248a011
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Pyrrole studies. 22. [4.pi. + 2.pi.] Cycloaddition reactions with vinylpyrroles (1980)
    s.l. : American Chemical Society
    The @journal of organic chemistry 45 (1980), S. 4515-4519 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo01310a056
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Discharge-excited free jet source of rare gas-halide and oxide molecules (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 1674-1682 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Intense rare gas-halide and rare gas-oxide excimer emission has been observed by coupling a pulsed electric discharge to a supersonic free jet expansion. A simple modification in the placement of the discharge anode drastically reduces the number of energetic electrons in the supersonic expansion region and permits large peak excimer populations to be produced by harpoon collisions involving rare gas metastables. The expansion velocity has been determined by spatially resolved spontaneous emission and laser-induced fluorescence measurements. Strong emission spectra from XeF, XeCl, KrF, KrCl, ArF, and the 2 3Π ion pair state of XeO have been recorded.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351197
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Modeling of horizontal magnetoresistive recording heads : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5408-5410 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A two-dimensional finite-element method was used to model a horizontal magnetoresistive head in order to test the fabrication design parameters. The device consists of two magnetoresistive elements placed closely together and parallel to the plane of the media, following a design of Chapman, Heim, and Williams [IEEE Trans. Magn. MAG-25, 3689 (1989)]. A single transition in the media was moved, in steps, past the head. The electrical signal strength and pulse width, due to this transition, were studied as a function of the shield permeability, thickness and shield gap, the sensor-sensor distance, the flying height, and sensor-shield distance. The width of the pulse did not show appreciable change with shield thickness, permeability, or shield gap size, although the signal strength changed significantly. A thin shield (1000 A(ring)) of moderately low permeability (2000) is therefore preferred. The signal fell off almost exponentially with flying height and sensor-shield separation. The situation where no shield was present was also simulated and showed a reasonably narrow pulse with a large undershoot and a long tail. These results indicate the horizontal head suggested by Chapman and co-workers may in fact provide good readback resolution with a thin shield or perhaps no shield whatsoever.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348020
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of anneal ambients and Pt thickness on Pt/Ti and Pt/Ti/TiN interfacial reactions (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 1764-1772 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using x-ray diffraction, Rutherford backscattering spectrometry, Auger electron spectroscopy, and scanning electron microscopy, effects of ambient anneal and Pt thickness on the interdiffusion of Pt/Ti bilayers deposited on SiO2/Si and on reactively sputtered TiN/Ti/Si substrates have been investigated. The Pt layer was 2000 or 930 A(ring) thick while the Ti thickness was fixed at 1000 A(ring). The wafers were annealed in either O2 or N2 ambients or in N2 followed by O2, with temperatures ranging from 600 to 800 °C for 30 min. The anneal ambients and the thickness of Pt relative to the Ti layer had tremendous effects on the interdiffusion processes, the reaction products, and the surface morphology of the multilayer structures. Samples annealed in O2 were generally rough, with bumps of the order of 1000 A(ring), while those annealed in N2 were relatively smooth. With lead zirconium titanate on top, the surface of Pt/Ti electrode annealed in O2 at 650 °C was relatively smooth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353212
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  • 6
    Electronic Resource
    Electronic Resource
    Cage molecules containing elements of groups V and VI. I. Structure determinations using simulated annealing (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 2942-2950 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Density functional calculations with simulated annealing have been performed to determine the structures and relative stabilities of stable isomers of seven-membered molecules containing elements of groups V (phosphorus, arsenic) and VI (sulfur, selenium, and tellurium). Particular attention is focused on structures related to P4S3 and P2S5, including the families PnAs4−nS3−mSem and P4SnTe3−n. We show that the bonding trends in all these molecules can be understood in terms of transferable bond energies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461991
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  • 7
    Electronic Resource
    Electronic Resource
    Structure of phosphorus clusters using simulated annealing—P2 to P8 (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 6710-6721 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The geometries of low-lying isomers of phosphorus clusters P2 to P8 have been calculated using a density functional (DF) method, combined with molecular dynamics (MD) and simulated annealing techniques. The structures and vibration frequencies are in excellent agreement with experiment in those cases (P2, P4) where spectroscopic data are available. A roof-shaped tetramer is a prominent structural unit in low-lying states of P5, P6, P7, and P8. Contrary to widespread belief, the most stable isomer of P8 is not cubic, but the "wedge'' or "cradle'' structure found as a structural unit in violet (monoclinic, Hittorf) phosphorus. The energetic ordering and geometrical shapes of the P8 isomers show striking analogies to the corresponding valence-isoelectronic hydrocarbons (CH)8 cubane, cuneane, and 2,2':4,4'-bis-(bicyclobutyl). The bonding and structural trends in phosphorus clusters are discussed in detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458306
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  • 8
    Electronic Resource
    Electronic Resource
    Cage molecules containing elements of groups V and VI. II. Molecular dynamics study of P4S3 and P3−7 (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 2951-2952 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Molecular dynamics (MD) simulations have been performed to determine the stability of the cagelike structure of the seven-membered systems P3−7 and P4S3. In both cases the cage structure remains intact during simulations of several picoseconds. However, fluxional behavior of the P3−7 trianion could be observed directly, whereas no isomerization took place in P4S3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461992
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  • 9
    Electronic Resource
    Electronic Resource
    Structure of phosphorus clusters using simulated annealing. II. P9, P10, P11, anions P2−4, P2−10, P3−11, and cations P+n to n=11 (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 7564-7572 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Previous calculations on the structures of isomers of phosphorus clusters P2 to P8 [density functional calculations with simulated annealing (SA), J. Chem. Phys. 92, 6710 (1990)] have been extended to P9, P10, and P11. The tendency of phosphorus to form tubular structures is already evident in clusters of this size. We have also performed calculations on additional isomers of the hexamer P6, positive ions up to P+11, and the P2−4, P2−10, and P3−11 anions. Ionization energies agree well with available measurements [P1 to P4] and show trends that can be correlated with the structures and the measured relative abundances of the ions. The calculated structure of P3−11 agrees very well with x-ray diffraction data, and we observe isomerization in P9 resulting from charge transfer. A simplified SA scheme using a linear combination of atomic orbitals (LCAO) has been used to aid the analysis of the results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462408
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  • 10
    Electronic Resource
    Electronic Resource
    Simulated annealing study of neutral and charged clusters: Aln and Gan (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 1194-1206 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Density functional calculations with simulated annealing have been performed for clusters of aluminum Aln and gallium Gan up to n=10. There are many local minima in the energy surfaces, with a rich variety of structures and spin multiplicities. With increasing cluster size we find transitions from planar to nonplanar structures at n=5, and to states with minimum spin degeneracy at n=6. Isomers (n≥5) with buckled planar structures reminiscent of the layers in crystalline α-gallium are generally less stable than "three-dimensional'' isomers. All structures show regular patterns of bond and dihedral angles. Systematic differences between Al and Ga clusters—bonds in the latter are shorter and bond angles closer to 90°—can be understood in terms of atomic properties. Trends in binding and ionization energies are compared with experiment and with the predictions of other calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465363
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