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    Wyświetlanie 1-6 z 6
    Tytuł:
    On Melting of Two-Dimensional Monolayer Films
    Autorzy:
    Patrykiejew, A.
    Zientarski, T.
    Binder, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945440.pdf
    Data publikacji:
    1996-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.65.-i
    64.60.-i
    Opis:
    The melting of two-dimensional films formed on the (100) fcc crystal is studied by Monte Carlo simulation. The results obtained suggest that in systems with only weakly corrugated surface potential, exhibiting the hexagonal close packed solid structure, the melting transition is followed by the Ising-type transition as predicted by the theory of Nelson and Halperin. In the case of highly corrugated surface potential, the film forms registered structure which disorders gradually as the temperature is raised.
    Źródło:
    Acta Physica Polonica A; 1996, 89, 5-6; 735-742
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Negatively and Positively Polarized Hydrogen Adspecies on Thin Platinum Films
    Autorzy:
    Nowicka, L.
    Wolfram, Z.
    Duś, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1892305.pdf
    Data publikacji:
    1992-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.65.-i
    73.60.Aq
    Opis:
    Hydrogen adsorption on thin platinum films under isothermal conditions within the temperature and pressure intervals 78-298 K and 10$\text{}^{-10}$-10$\text{}^{-2}$ Torr has been studied measuring simultaneously surface potential (SP) and pressure (P), by means of a sensitive, short response time apparatus. Two forms of hydrogen deposit of different electrical character have been distinguished. The first one arising at the beginning of adsorption decreases the surface potential, the second one following it increases the SP due to positively polarized adspecies formation. This positively polarized form is inhomogeneous as concerns binding energy. Hydrogen uptake associated with the decrease of SP becomes larger with increase of temperature. It seems that this β¯ form of the adsorbate stabilizes the positively polarized adspecies on the surface.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 1; 117-124
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Screening of Intermolecular Forces in Adsorbates
    Autorzy:
    Mahanty, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1892218.pdf
    Data publikacji:
    1992-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.65.-i
    68.90.+g
    Opis:
    The interaction potential of a pair of adsorbed molecules differ from that of the same molecules in free space, because of the response of the substrate. This response does not influence much the short-range repulsive part of the potential; only the long-range attractive part is affected. The change due to the influence of the substrate has been the subject of extensive study, both theoretically and experimentally. In this paper the problem is formulated in terms of the dynamic charge response properties of the interacting pair, and applications to the case of adsorbed molecules on model metal surfaces is described.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 1; 73-84
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Conducting Organic Solids for Biological Sensors: Successes and Problems
    Autorzy:
    Kryszewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1932273.pdf
    Data publikacji:
    1995-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.65.-i
    81.60.Jw
    Opis:
    Studies on the basic properties and fabrication of biosensors based on conducting organic polymers have been reviewed. Several types of biosensors and some classes of conducting polymers used in biosensors are described. It is shown that their selective responses towards a dissolved analyte have lead to their successful application in a new generation of ion, molecular and biosensors. Some important open problems in this fast growing field have also been indicated. They are related with the complex interactions of biomolecules and/or cells with the conducting transducers. The present tendency to extreme miniaturization of biosensors related to the utilization of a few biomolecules and/or a single cell as a heart of biosensing devices seems to be very close to molecular electronics.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 4-5; 683-698
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Correspondence of the Experimental EEL Spectra with the Electron Structure of Tungsten
    Autorzy:
    Czyżewski, J.J.
    Krajniak, J.
    Klein, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1892216.pdf
    Data publikacji:
    1992-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.20.Fv
    61.80.Mk
    82.65.-i
    Opis:
    In the previous paper [7] we have directly compared the experimental Electron Energy Loss (EEL) spectra with both the theoretical bulk density-of-states (BDOS) and surface density-of-states (SDOS) functions for tungsten. On the base of the ILEED intensity calculations we have estimated to what extend an EEL spectrum measured at some value of the primary electron energy E$\text{}_{p}$, should correspond either to the SDOS or to the BDOS. Also, the angular acceptance of a CMA has been used to separate the EEL spectra measured as a function of E$\text{}_{p}$ which corresponded either to the [001] direction or to the [011] in parallel to the studied (001) surface. In the present paper we propose a procedure which combines the Electron Energy Loss Spectra (EELS) simulation method based on Bauer's theory [1,2] and the inelastic low energy diffraction (ILEED). If the standard simulation procedure is applied for tungsten an ambiguity would arise because the DOS function is very anisotropic and varies as a function of both the direction along the surface and the depth considered within several atomic layers. The application of ILEED has supplemented the simulation procedure with the method which identifies both the correspondence of a reciprocal-lattice vector to a measured EEL spectrum and the localization of a studied electron structure with regard to the distance from the surface.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 1; 67-72
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spatially Resolved Chemistry on Bimetallic Surfaces
    Autorzy:
    Behm, R. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968689.pdf
    Data publikacji:
    1998-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.16.Ch
    68.10.Jy
    82.65.-i
    Opis:
    The local chemical properties of bimetallic surfaces, which are often drastically different from those of each of the components, will be discussed. Using CO adsorption as a probe molecule it will be shown for two model systems, Au/Pd(111) and Pt/Ru(0001), that their chemical properties depend decisively on the local surface structure and that the correct interpretation of area integrating spectroscopic and kinetic data obtained from such surfaces requires detailed knowledge of their (defect) structure and of the distribution of the different components in the surface layer. It will further be shown that information on the local chemical properties of specific structural elements such as monolayer islands and monolayer island edges, and specific surface ensembles can be gained by applying high resolution scanning tunneling microscopy imaging and area integrating spectroscopic techniques in combination to bimetallic surfaces whose morphology and composition is varied in a systematic and controlled way. Based on experimental results adsorption on a monolayer A / substrate B system is suggested as a model for gaining information on the modifications in chemical properties of AB alloy surfaces due to metal-metal interactions.
    Źródło:
    Acta Physica Polonica A; 1998, 93, 2; 259-272
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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