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Wyszukujesz frazę "Goslar, T." wg kryterium: Wszystkie pola

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Applications of the Transport Integrals in Solid-State Physics and in Electron Spin Relaxation
    Autorzy:
    Radczyk, T.
    Hoffmann, S. K.
    Goslar, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2036991.pdf
    Data publikacji:
    2003-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.90.+t
    76.30.-v
    Opis:
    Transport integrals I$\text{}_{n}$(Θ$\text{}_{D}$/T) are reviewed with their applications in solid-state physics, molecular dynamics, and electron spin-lattice relaxation. Analytical approximations of I$\text{}_{n}$ for n=2-8 are proposed as applicable for computer fitting procedures in the range of the variable x=Θ$\text{}_{D}$/T from 0.1 to 40. The results are applied for description of the spin-lattice relaxation data collected for Cu$\text{}^{2+}$ ions in triglycine sulphate and are compared with relaxation data for Cu$\text{}^{2+}$ and Mn$\text{}^{2+}$ in (NH$\text{}_{4}$)$\text{}_{2}$Mg(SO$\text{}_{4}$)$\text{}_{2}$·6H$\text{}_{2}$O.
    Źródło:
    Acta Physica Polonica A; 2003, 104, 5; 469-477
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Vibronic Dynamics of Cu(H$\text{}_{2}$O)$\text{}_{6}$ Complexes and Electron Spin Relaxation in Temperature Dependence of EPR Linewidth in Diamagnetic Tutton Salt Single Crystals
    Autorzy:
    Hoffmann, S. K.
    Goslar, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047171.pdf
    Data publikacji:
    2006-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.90.+t
    76.30.-v
    Opis:
    EPR linewidth of Cu$\text{}^{2+}$ in the Tutton salt crystals weakly depends on temperature at low temperatures and then it rapidly grows above 60 K. We present detailed results of measurements and analysis for $\text{}^{63}$Cu$\text{}^{2+}$ in K$\text{}_{2}$Zn(SO$\text{}_{4}$)$\text{}_{2}$·6 H$\text{}_{2}$O, K$\text{}_{2}$ Zn(SO$\text{}_{4}$)$\text{}_{2}$·6D$\text{}_{2}$O, (NH$\text{}_{4}$)$\text{}_{2}$Mg(SO$\text{}_{4}$)$\text{}_{2}$·6H$\text{}_{2}$O and Cs$\text{}_{2}$Zn (SO$\text{}_{4}$)$\text{}_{2}$·6H$\text{}_{2}$O in a temperature range of 4.2-300 K and compare them with already published electron spin-lattice relaxation data. The relaxation contributes weakly to the linewidth which is dominated by molecular dynamics and grows exponentially with temperature. To describe this we are discussing the influence of jumps between two sites of Cu$\text{}^{2+}$ complexes in a slow motion region where the sites are differently thermally populated. This case has not been considered so far. We have derived appropriate expressions describing the contribution of jumps to the linewidth which allows the determination of the jump rate and energy difference δ$\text{}_{A,B}$ between the two sites being two Jahn-Teller distorted configurations of the vibronic Cu(H$\text{}_{2}$O)$\text{}_{6}$ complexes. The jump rate 1/τ strongly depends on temperature and reaches 10$\text{}^{9}$ s$\text{}^{-1}$ at room temperature, whereas theδ$\text{}_{A,B}$ varies from 117 cm$\text{}^{-1}$ for K$\text{}_{2}$Zn(SO$\text{}_{4}$)$\text{}_{2}$·6D$\text{}_{2}$O to 422 cm$\text{}^{-1}$ for Cs$\text{}_{2}$Zn(SO$\text{}_{4}$)$\text{}_{2}$·6 H$\text{}_{2}$O. The comparison with vibronic level splitting, which varies in the range of 67-102 cm$\text{}^{-1}$, indicates that the reorientation mechanism involves phonon induced tunnelling via excited vibronic levels. These reorientations do not contribute, however, to the spin-lattice relaxation which is governed by ordinary two-phonon relaxation processes in the whole temperature range. Thus, the reorientations and spin relaxation are two independent phenomena contributing to the total linewidth.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 6; 807-816
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electron Spin Relaxation of Cu(II) Ions in ZnGeF$\text{}_{6}$·6H$\text{}_{2}$O Crystal with Strong Jahn-Teller Effect
    Autorzy:
    Idziak, S.
    Hoffmann, S. K.
    Goslar, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043479.pdf
    Data publikacji:
    2005-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.90.+t
    76.30.-v
    Opis:
    Cu$\text{}^{2+}$ ions doped to ZnGeF$\text{}_{6}$·6H$\text{}_{2}$O substitute the host Zn$\text{}^{2+}$ ions and undergo a strong Jahn-Teller effect producing nearly axial elongation of the Cu(H$\text{}_{2}$O)$\text{}_{6}$ octahedra with equal population of the three possible deformations at low temperatures as shown by the EPR spectra. Reorientations between these distorted configurations are observed as a continuous shift of EPR lines leading to averaging of the g- and A-tensors. The full averaging is observed at the phase transition temperature 200 K. Electron spin relaxation was measured up to 45 K only, where the electron spin echo signal was detectable. Electron spin-lattice relaxation is governed by the Raman two-phonon process allowing to determine the Debye temperature asΘ$\text{}_{D}$=99 K. There is no contribution of the Jahn-Teller dynamics to the spin-lattice relaxation rate. Electron spin echo decay is strongly modulated by dipolar coupling to the $\text{}^{1}$H and $\text{}^{19}$F nuclei. The phase memory time is governed by instantaneous diffusion at helium temperatures and then by spin-lattice relaxation processes and excitation to the first vibronic level of energyΔ=151 cm$\text{}^{-1}$.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 1; 177-185
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The first geological record of a palaeotsunami on the southern coast of the Baltic Sea, Poland
    Autorzy:
    Rotnicki, K.
    Rotnicka, J.
    Goslar, T.
    Wawrzynniak-Wydrowska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059831.pdf
    Data publikacji:
    2016
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Baltic Sea
    onshore tsunami deposits
    age of tsunami
    Holocene coastal changes
    meteorite impact
    Opis:
    Tsunami deposits were unknown along the southern coast of the Baltic Sea for a long time. The results of present research provided evidence of high-energy event layers. They occur on the bottom of two hemispherical hollows that are cut into glaciolimnic silt and glaciofluvial sand and gravel from the Late Weichselian Age. The event deposits are represented by poorly sorted marine sand with admixtures of pebbles and allochthonous detritus of biogenic origin: marine, brackish and occasionally freshwater shells and shell debris of molluscs and snails, plant macrofossils from the marine nearshore zone, shreds and lumps of peaty material, gyttja and organogenic silt, lumps of charcoal, wood pieces and tree branches and trunks. All these features are commonly considered indicative of tsunamis. The age of the biogenic detritus found in the tsunami layer ranges from 10 390 to 6 630 cal. yr BP, whereas the oldest gyttja covering the event layers is 6 600 cal. yr BP old. This means that the tsunami occurred between 6 630 and 6 600 cal. yr BP. Various causes of tsunami event have been taken into consideration, including the impact of meteorites within the coastal plain and the littoral zone of the southern Baltic Sea.
    Źródło:
    Geological Quarterly; 2016, 60, 2; 417--440
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Variable isostatic uplift patterns during the holocene in southeast Sweden, based on high-resolution ams radiocarbon dating of lake isolations - a preliminary interpretation
    Autorzy:
    Risberg, J.
    Alm, G.
    Goslar, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1204994.pdf
    Data publikacji:
    2008
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    isostatic uplift
    ams radiocarbon dating
    Holocene
    south-eastern Sweden
    Opis:
    To describe changes in shoreline configuration in northern Uppland, south-east Sweden, the isolations of 17 present and overgrown lakes have been interpreted from diatom analysis and AMS radiocarbon dates on terrestrial macrofossils. The sites studied are spread c. 60 km in east-west and c. 70 km in north-south direction. The oldest isobase direction, representing the "Neolithic Sea", extends in more or less north-south direction. The present day isobase system shows a clear east-west trend. The results indicate a complicated pattern of isostatic uplift during the late Holocene. We have defined five different shore displacement curves denoted A–E. It is obvious that the present day east-western isobase system is not valid for the investigated sites. Instead, the north-south isobases for the "Neolithic Sea" should to a relatively high degree explain the geographic distribution of sites. It is suggested that a re-direction of the isostatic uplift pattern has occurred sometime during the last c. 5000 years. This shift could have taken place as a slow deformation of the bedrock and/or as neotectonic movements along existing fault lines.
    Źródło:
    Polish Geological Institute Special Papers; 2008, 23; 77-80
    1507-9791
    Pojawia się w:
    Polish Geological Institute Special Papers
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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