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    Wyświetlanie 1-8 z 8
    Tytuł:
    CO-induced photoemission structures of the CO/Pt/Ru(0001) interface
    Autorzy:
    Godowski, P.J.
    Onsgaard, J.
    Li, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1058526.pdf
    Data publikacji:
    2016-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.Jv
    33.60.+q
    82.80.Pv
    Opis:
    The CO/Pt/Ru(0001) interface has been re-examined, in great detail, by photoelectron spectroscopy of high resolution under UHV conditions. The Ru(0001) substrate has been modified by platinum at coverages less than corresponding to the one, saturated, Pt overlayer, with no Pt/Ru intermixing. The analysis of the extent to which different regions of the photoelectron spectrum allow a detailed characterization of the interface is presented. The CO adsorption displays interaction with two separate phases: the Pt(111) face and the Ru(0001) surface.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 6; 1389-1394
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural and Optical Properties of ZnO Nanowires Doped with Magnesium
    Autorzy:
    Zhuang, H.
    Wang, J.
    Liu, H.
    Li, J.
    Xu, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1505046.pdf
    Data publikacji:
    2011-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.46.Km
    61.72.uj
    81.15.Gh
    78.67.-n
    Opis:
    ZnO nanowires doped with Mg have been successfully prepared on Au-coated Si (111) substrates using chemical vapor deposition method with a mixture of ZnO, Mg, and activated carbon powders as reactants at 850°C. The structural, compositional, morphological and optical properties of the samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy, and photoluminescence spectroscopy. The nanowires are single crystalline in nature and preferentially grow up along [0001] direction with the average diameter and length of about 60 nm and several hundred micrometers, respectively, thinner and longer than the results of literature using the similar method. Room temperature photoluminescence spectroscopy shows a blueshift from the bulk band gap emission, which can be attributed to Mg doping that were detected by energy dispersive X-ray analysis EDX in the nanowires. Finally, the possible growth mechanism of crystalline ZnO nanowires is discussed briefly.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 6; 819-823
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoemission Study of the Initial Growth of Co on Ru(0001)
    Autorzy:
    Godowski, P. J.
    Onsgaard, J. J.
    Trzebiatowska-Gusowska, M. J.
    Pater, K. J.
    Li, Zhe
    Powiązania:
    https://bibliotekanauki.pl/articles/2047268.pdf
    Data publikacji:
    2007-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.Dp
    79.60.Jv
    68.55.Jk
    Opis:
    The growth process of cobalt on Ru(0001) was characterized by photoelectron spectroscopy excited by X-ray and synchrotron radiation. The binding energy position and intensity of the Co 2p$\text{}_{3}\text{}_{/}\text{}_{2}$ and Ru 3d$\text{}_{5}\text{}_{/}\text{}_{2}$ core levels as well as the shape and structure of the valence band spectra corresponding to the different stages of the deposition were investigated. An observed small positive binding energy shift is a consequence of an increase in the cobalt adatoms coordination number. The core-level shift between bulk and surface Ru atoms is determined as -360 meV. Upon adsorption of cobalt, the interface peak appears with a shift of -(70÷80) meV relative to the bulk one. On the basis of unchanged energy positions and widths of the Ru-derived features of the valence band spectra, a weak interaction between cobalt and substrate is suggested. The measured valence band could be reproduced by superimposing the spectra of the pure elements.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 2; 263-271
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Interaction of Water with Glycine: A Combined Inelastic Neutron Scattering and Raman Spectra Studies
    Autorzy:
    Zhang, P.
    Zhang, Y.
    Han, S.
    Yan, Q.
    Li, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044762.pdf
    Data publikacji:
    2006-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    36.20.Ng
    87.64.Je
    25.40.Fq
    82.30.Rs
    Opis:
    The vibrational dynamics of water around glycine was investigated by using Raman spectroscopy and inelastic neutron scattering. Experiments of deuterated glycine versus deuterium were performed as comparison. The study shows that for glycine, the exchange of proton-deuteron on the active NH$\text{}_{3}^{+}$ side was easy, whereas there was hardly exchange on the CH$\text{}_{2}$ side. Comparing different proportion of glycine vs. water molecules we obtained that the presence of water hardly changes the main features of glycine illustrating its hydrophobic character. The intralayer hydrogen bonds of glycine crystal are difficult to be replaced due to its stronger bond than water.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 3; 399-404
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Graphics Processing Unit for In-Line Electron Holography
    Autorzy:
    Morawiec, K.
    Dłużewski, P.
    Kret, S.
    Szczepańska, A.
    Li, T.
    Sloan, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033020.pdf
    Data publikacji:
    2017-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.37.Lp
    68.37.Og
    68.55.Nq
    42.30.Rx
    61.05.jp
    07.05.Pj
    42.30.-d
    42.30.Wb
    Opis:
    In the present work, software for exit electron wave reconstruction based on the iterative approach was implemented and a new method for drift-correction of the focal series was proposed.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 5; 1353-1356
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Off-Axis Electron Holography of Magnetic Nanostructures: Magnetic Behavior of Mn Rich Nanoprecipitates in (Mn,Ga)As System
    Autorzy:
    Barańska, M.
    Dłużewski, P.
    Kret, S.
    Morawiec, K.
    Li, Tian
    Sadowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033003.pdf
    Data publikacji:
    2017-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.jp
    68.37.Lp
    07.05.Pj
    75.50.Pp
    Opis:
    The Lorentz off-axis electron holography technique is applied to study the magnetic nature of Mn rich nanoprecipitates in (Mn,Ga)As system. The effectiveness of this technique is demonstrated in detection of the magnetic field even for small nanocrystals having an average size down to 20 nm.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 5; 1406-1408
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Defect Recovery in α-Fe e$\text{}^{-}$-irradiated at 300 K
    Autorzy:
    Dai, G. H.
    Li, X. H.
    Moser, P.
    Moya, G.
    Van Duysen, J. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1928989.pdf
    Data publikacji:
    1993-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.70.Bv
    61.80.Fe
    78.70.Bj
    Opis:
    Defect annealing recovery has been studied, by measuring positron lifetime spectra, in high-purity α-iron irradiated at 300 K with 3 MeV electrons to a fluency of 7 × 10$\text{}^{19}$ cm$\text{}^{-2}$. Vacancy clusters containing 6-10 single vacancies were observed immediately after irradiation during which they were possibly forming (the so-called "irradiation annealing"). With increasing temperature, the agglomerates continually grow in size at the expense of their concentration, giving rise to the formation of microvoids (> 15 vacancies). Also present were other types of defects, probably immobile vacancies trapped by impurity (e.g. carbon) atoms and dislocation/loops generated presumably from collapse of voids during the relatively high dose irradiation and/or the annealing. The immobile vacancies eventually became movable at around 350 K, supplying the growing clusters and thus leading to a stabilization in their concentration till around 500 K. Between 500 and 700 K, microvoids gradually evaporated, but the dislocation-associated defects were able to survive annealing at temperatures as high as 700 K. The void size and concentration and their evolution have been evaluated on the basis of both the to date theoretical and experimental studies. The temperature dependence was also, observed of positron trapping into vacancy agglomerates of various sizes.Za
    Źródło:
    Acta Physica Polonica A; 1993, 83, 3; 277-286
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetooptical Properties of (Ga,Fe)N Layers
    Autorzy:
    Papierska, J.
    Rousset, J.
    Pacuski, W.
    Kossacki, P.
    Golnik, A.
    Nawrocki, M.
    Gaj, J.
    Suffczyński, J.
    Kowalik, I.
    Stefanowicz, W.
    Sawicki, M.
    Dietl, T.
    Navarro-Quezada, A.
    Faina, B.
    Li, T.
    Bonanni, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492954.pdf
    Data publikacji:
    2011-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    75.30.Hx
    78.20.Ls
    71.35.Ji
    Opis:
    Magnetooptical properties of (Ga,Fe)N layers containing various concentrations of Fe-rich nanocrystals embedded in paramagnetic (Ga,Fe)N layers are reported. Previous studies of such samples demonstrated that magnetization consists of a paramagnetic contribution due to substitutional diluted Fe ions as well as of ferromagnetic and antiferromagnetic components originating from Fe-rich nanocrystals, whose relative abundance can be controlled by the growth conditions. The nanocrystals are found to broaden and to reduce the magnitude of the excitonic features. However, the ferromagnetic contribution, clearly seen in SQUID magnetometry, is not revealed by magnetic circular dichroism. Possible reasons for differences in magnetic response determined by magnetic circular dichroism and SQUID measurements are discussed.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 5; 921-923
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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