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  • Springer  (147)
  • American Institute of Physics (AIP)  (31)
  • Blackwell Publishing Ltd  (13)
  • Oxford University Press  (12)
  • Nature Publishing Group  (6)
  • 1990-1994  (191)
  • 1960-1964  (18)
  • 1990  (191)
  • 1963  (18)
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  • 1990-1994  (191)
  • 1960-1964  (18)
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  • 11
    Electronic Resource
    Electronic Resource
    A variational method for the calculation of vibrational energy levels of triatomic molecules using a Hamiltonian in hyperspherical coordinates (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 8902-8914 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A full variational procedure is presented which is particularly suited to the calculation of vibrational (J=0) energy levels of triatomic potentials with large amplitude motions and also allows for high permutational symmetries. Starting from simple basis functions reflecting the structure of the kinetic energy operator, an optimized basis set is derived by a step-wise contraction scheme. The method is applied to H+3 and Na+3 (D3h) and to model potentials for H2O+ (C2v) and HLiH− (D∞h). The results for H+3 are shown to be superior to all previous calculations, in particular for those energy levels that lie above 20 000 cm−1. A new ab initio potential is presented for Na+3, for which converged energy levels are calculated up to 3500 cm−1. For H2O+ and HLiH−, the calculated energy levels agree with those obtained from a variational procedure in internal valence coordinates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459229
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  • 12
    Electronic Resource
    Electronic Resource
    Rotationally inelastic scattering of NH3 with H2: Molecular-beam experiments and quantum calculations (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 6419-6432 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In crossed molecular-beam experiments, three type of cross sections have been measured: Total differential cross sections with well-resolved diffraction oscillations for oD2–NH3 at E=95.9 and 111.3 meV, differential energy-loss spectra for ND3–oD2 at E=118.3 meV which cover the center-of-mass (c.m.) angular range from 85° to 170° and are obtained by time-of-flight (TOF) analysis, and state-to-state integral cross sections for oNH3–H2 and pNH3–H2 at E=75 meV for many final rotational states which are detected by resonance enhanced multiphoton ionization. These data which are mainly sensitive to the anisotropy of the potential energy surface are well reproduced by quantum calculations in the coupled-states approximation. The potential is constructed by combining large basis-set self-consistent-field (SCF) calculations with damped long-range dispersion coefficients. The two free parameters of the damping function are fitted to a restricted set of configuration interaction (CI) calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458958
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  • 13
    Electronic Resource
    Electronic Resource
    Molecular dynamics of a plastic crystal with two types of orientational disorder: Static and dynamic properties of plastic bicyclooctane (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 1313-1324 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A molecular dynamics simulation of a realistic model of bicyclo-octane [HC(CH2–CH2)3CH] in its plastic phase has been performed at three different temperatures. The interactions between the molecules of the simulated system are calculated with phenomenological exp-6 additive atom–atom potentials. The molecules are considered rigid and their equations of motion are integrated using a method of constraints. A special attention is given to the problem of the C–H bond value. The static analysis of the molecular dynamics (MD) results yields a clear description of two types of orientational order: It confirms the experimental results about the equipartition of the molecular threefold axes around the eight 〈111〉 crystallographic axes and it furthermore unambiguously shows the existence of six preferred orientations for the orientational order of the molecules around their threefold axes where a previous experimental work concluded in favor of a quasifree rotation. The mean-square displacement amplitudes of the molecular centers of mass reveal that our simulation model is not impeded by the abnormal behavior of the exp-6 potentials at small interactive distances. From a dynamical point of view, the molecular dynamics scheme clearly shows that the jumps are not instantaneous and are slightly more diverse than previously assumed. In order to achieve a precise description of these jumps, we propose to make a conceptual distinction between the mean residence times and the correlation times. By contrast with a former MD simulation, our model gives two sets of distinct characteristic times which perfectly agree with the experimentally deduced values. Given the simplifying assumptions entering the experimental models, the quality of this latter agreement also shows a certain lack of sensitivity vis a¯ vis the exact nature of the underlying microscopic mechanisms. We also examined the ability of our model to simulate the behavior of a monovacancy. We found the influence of such a defect on its immediate neighborhood to be very small even when considering the nature of the complex orientational (dis)order.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459143
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  • 14
    Electronic Resource
    Electronic Resource
    Deposition of mass selected silver clusters in rare gas matrices (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 8535-8543 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report on the successful "soft landing'' of size selected silver dimers and trimers in solid krypton matrices. Silver cluster cations, produced by sputtering, were mass selected in a quadrupole mass filter and then codeposited with krypton on a cooled sapphire or CaF2 window in the presence of low energy electrons. Neutralized cluster samples were interrogated in situ by excitation and fluorescence spectroscopy. Deposition of slow (≤20 eV) silver dimer cations gave rise to strong excitation bands (centered at λ=275 and 390 nm) from Ag2 plus the characteristic triplet signal of the atom. The spectra imply that fewer than 25% of the dimers were fragmented during the neutralization and deposition steps. In similar experiments with Ag3 we were able to assign trimer absorption bands at 331, 364, 402, 421, 458, and 514 nm and identify characteristic emission features at 381, 560, and 626 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459291
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  • 15
    Electronic Resource
    Electronic Resource
    An automated light scattering system scanning in two spherical angles (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 2069-2072 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have designed and built a light scattering system that can detect scattered light in two spherical angles with scanning ranges more than 270° about the vertical axis and 100° about a horizontal axis. The detector and the sample holder are automated by high-precision stepping motors with a minimal angular increment 0.01° or 0.02°. A novel modular design in the detector allows the experimenter to examine the image of the scattering object and the direction of the scattered light while the detector is fixed at the measurement position. The angular resolution of the system is smaller than 0.19° in both azimuthal and polar directions. This setup has been successfully applied to study the static and dynamic properties of the ordered phases in colloidal solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141419
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  • 16
    Electronic Resource
    Electronic Resource
    Recent results from experiments on x-ray confining cavities (abstract) : Eighth topical conference on high−temperature plasma diagnostics (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 2813-2813 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: In continuation of the collaborative work between the Institute of Laser Engineering, Osaka and Max–Planck-Institut für Quantenoptik, Garching on x-ray confining cavities, we have performed a new series of experiments using the GEKKO-XII laser facility (4 kJ, 0.9 ns, λ=0.35 μm). The results from two experimental objectives will be presented. The first objective was the direct observation of the x-ray confinement effect in a cavity. A special design target allowed the simultaneous measurement of the x-ray flux emanating from a "closed'' cavity and an "open'' cavity. The second objective was the study of radiation transport mechanism in high- and low-Z materials. Thin foils of Au and Al were used as windows on diagnostic holes of x-ray confining cavities and their emission was compared to that of an open hole. A summary of the main results will be presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141839
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  • 17
    Electronic Resource
    Electronic Resource
    Simultaneous measurement of lateral and normal forces with an optical-beam-deflection atomic force microscope (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 2089-2091 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An atomic force microscope capable of measuring, simultaneously yet separately, lateral ("frictional'') and normal forces is described. A direction-dependent feature, absent in topological images, is found when scanning stepped surfaces of NaCl (001) in ultrahigh vacuum. A simple model is presented to account for this observation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103950
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  • 18
    Electronic Resource
    Electronic Resource
    Nonlinear optical properties of molecular beam epitaxy grown Bi1−xSbx (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 336-338 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We discuss the first investigation of Bi1−xSbx as an infrared nonlinear optical material. Nondegenerate four-wave mixing experiments at CO2 laser wavelengths yield a large nonlinearity (χ(3)≈3×10−4 esu) which does not saturate at power densities up to 0.5 MW/cm2. Both the ambient and substrate interfaces of the film are highly reflective and the étalon they form is found to have a large effect on the transmission and reflectivity spectra of the as-grown films. This suggests the possibility that constructive interference of the film's internal optical fields could be used to considerably enhance the nonlinear signal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103683
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  • 19
    Electronic Resource
    Electronic Resource
    Optical-beam-deflection atomic force microscopy: The NaCl (001) surface (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 2100-2101 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have imaged, in ultrahigh vacuum, the (001) surface of NaCl using an optical-beam-deflectin force microscope operating in the short-range repulsive regime. The design and performance characteristics of the microscope are given, and the observed atomic corrugations are compared with those deduced from He-atom scattering experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102985
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  • 20
    Electronic Resource
    Electronic Resource
    Higher order electron cyclotron resonances in n-type HgTe-CdTe superlattices (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 1781-1783 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Temperature-dependent magneto-optical measurements on an n-type HgTe-CdTe superlattice have been compared to the results of a comprehensive new theory, which fully incorporates the complexities of the unusual superlattice band structure. The theory predicts that higher order cyclotron resonance processes should yield a separate transmission minimum which is distinct from that of the lowest order cyclotron transition, and the data provide an unambiguous confirmation of this prediction. Since the energy gap is near zero, interband transitions are also observed in the same spectral range as the cyclotron resonance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104040
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