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  • 1
    Digitale Medien
    Digitale Medien
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 4124-4131 
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: In their present embodiment, sensors used in interfacial force microscopy do not have the necessary mechanical bandwidth to be employed as free-running tapping mode devices. We describe an extremely stable method of obtaining tapping mode images using feedback on the sensor. Our method is immune to small dc drifts in the force signal, and the prospect of diminishing the risk of damaging fragile samples is realized. The feasibility of the technique is demonstrated by our imaging work on a Kevlar fiber-epoxy composite. We also present a model which accounts for the frequency dependence of the sensor in air when operating under closed loop control. A simplified force modulation model is investigated to explore the effect of contact on the closed loop response of the sensor. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 659-663 
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The geometric structure of a NiO(111) film on Ni(100) has been determined by dynamical low-energy electron-diffraction analysis. The oxide film is sufficiently thick and uniform to carry out the analysis in the bulk crystal limit. Four orientational domains of NiO(111) are present. We consider four possible terminations of the oxide film (oxygen or nickel, fcc or hcp sites). Our results indicate that the oxide film terminates with a topmost layer of oxygen in fcc sites, and exhibits a 14.8% contraction in the first interlayer spacing relative to the "bulk'' interlayer spacing of the film. The "bulk'' lattice parameters of the oxide film are found to be uniformly compressed by 2.6% relative to bulk NiO(111). Comparison with other work suggests that oxygen termination, a strong contraction in the first interlayer spacing, and retention of cubic symmetry in deeper layers may be general characteristics of unreconstructed rocksalt(111) surfaces of metal oxide films.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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