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  • American Institute of Physics (AIP)  (4)
  • 2020-2024
  • 2000-2004  (1)
  • 1990-1994  (3)
  • 1
    Electronic Resource
    Electronic Resource
    X-ray diffraction study of the structure of a monolayer methanol film adsorbed on graphite (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 5267-5270 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The x-ray diffraction measurements of methanol adsorbed on graphite have been taken over the temperature range 32–150 K and the coverage range 0.02–0.17 molecule A(ring)−2. The diffraction data are analyzed to yield the configuration of the molecule on the surface by means of the least-squares fitting of the whole pattern. The data show clearly that zigzag chains of alternating weak and strong hydrogen bonds, as evidenced by the long and short 0⋅⋅⋅0 separations, are formed in the crystalline monolayer of methanol on graphite. The crystalline solid film near the complete monolayer melts around 142 K in comparison to bulk methanol which melts at 175.4 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459645
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Ion cyclotron resonance in a magnetized sheet plasma : Proceedings of 5th international conference on ion sources (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 1359-1361 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Separation of ionic or isotopic species in a magnetized sheet plasma has been studied by using the ion cyclotron resonance method. The sheet plasma was used instead of a cylindrical plasma in which many unfavorable collisions take place. An rf electric field is applied to the plasma by two parallel plate electrodes. It is shown that a resonance is strongly dependent on the plasma space potential across the sheet plasma. The resonance spectra of argon, neon, and nitrogen ions in the low dense sheet plasma with a shallow potential well are clearly observed, while the resonances in high dense plasma with a deep potential well are not observed. It is also found that the resonance frequency for a corresponding ion is proportional to the magnetic field strength.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144960
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  • 3
    Electronic Resource
    Electronic Resource
    X-ray topographic study on dislocation configuration around indentation in a plastic region of Si single crystal (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 2367-2372 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This paper describes the dislocation configuration around an indentation on the (111) surface of a Si single crystal. X-ray Lang topography was used. The Burgers vector was identified for each section of the dislocation clustering region based on the change of the contrast of the diffraction pattern with various diffraction vectors. Additionally, the mechanism of dislocation interaction was discussed resulting in the observed configuration. The following results were obtained. The dislocation clustering region was divided into the inner and the outer territories, each of which was further divided into several sections with different Burgers vectors. It was assured that dislocations in the outer territory were perfect, while they split into partial dislocations in the inner territory. Therefore dislocation interactions were possible in the inner territory resulting in stair-rod dislocations. The observed configuration could be explained by the mechanism of the dislocation interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356257
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  • 4
    Electronic Resource
    Electronic Resource
    Systematics of elasticity: Ab initio study in B1-type alkaline earth oxides (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 10086-10093 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The elastic properties and their pressure dependence of four B1-type alkaline earth oxides, MgO, CaO, SrO, and BaO, are calculated using the ab initio full-potential linear muffin-tin-orbital (FP-LMTO) generalized gradient approximated (GGA) method to elucidate their systematics. The calculated results agree quite well with the comparable experimental data. The large pressure dependence of c11 and c44 of MgO observed over 25 GPa is not predicted as well as the previous local-density approximation (LDA) calculations. It is inferred that the high-pressure measurement of elastic constant is quite sensitive to nonhydrostaticity. The deviation from the Cauchy relation and the elastic anisotropy are investigated. It is found that the interatomic interaction in SrO is nearest to the two-body force and the many-body contribution is largest in MgO. The elastic anisotropy in SrO and BaO are almost the same and only MgO has a large positive anisotropy under low pressure. The normalized elastic constants cij′ are introduced for more detail analysis. It is found that while there is no substantial difference in c11′ and c12′ of the four oxides, only c44′ and its pressure dependence vary systematically. The difference in the Cauchy deviation and elastic anisotropy of alkaline earth oxides under pressure is characterized by c44. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1371498
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