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  • 1
    Digitale Medien
    Digitale Medien
    Medium and long range correlations in the electrolyte LiCl⋅4H2O: Transition to the glass regime (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 1897-1903 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: New data on the structure of water in the aqueous system LiCl⋅RH2O, with R=4, are presented for the liquid, supercooled liquid, and glass states. The results are compared to an earlier study of the system LiCl⋅6H2O [J. Chem. Phys. 103, 1886 (1995)]. Many of the qualitative trends seen for R=6 are similar for R=4, but there is evidence that the water structure is even more severely disrupted than for R=6. In the liquid state the distribution functions appear to be dominated by the packing of hydrated ions, rather than by hydrogen bonding forces. The latter partly reassert themselves in the supercooled and glass states. H/D isotope substitution throws some light on the first structure diffraction peak (FSDP) at 0.5 A(ring)−1 which is correlated with the nonhydrogenated components. This peak is not therefore the signature of long range water concentration fluctuations, but must be due to some weak periodicity in the underlying longer range order. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.470697
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  • 2
    Digitale Medien
    Digitale Medien
    Structural characterization of an electrolytic aqueous solution, LiCl⋅6H2O, in the glass, supercooled liquid, and liquid states (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 1886-1896 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Using the technique of hydrogen and deuterium substitution, the structure of water in concentrated lithium chloride aqueous solutions (LiCl⋅6H2O) is explored for the liquid, supercooled liquid, and glass states. It is found that changes in structure between the glass and supercooled states are minor, but that a major change in water structure occurs as the supercooled liquid is heated above the temperature of peritexy of the penta-hydrate (Tp=207 K). In particular the 4.4 A(ring) peak in the OO pair correlation function of pure water, which is normally viewed as indicating tetrahedral short range coordination in water, is absent in the LiCl solution at the same temperature, but reappears strongly in the glass and supercooled states. Corresponding changes occur in the HH and OH correlation functions. In addition, correlations appear to extend nearly twice as far in the glass and supercooled liquid, compared to the room temperature liquid. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.469713
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  • 3
    Digitale Medien
    Digitale Medien
    Low-energy excitations in glass-forming aqueous lithium–chloride (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 8114-8117 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Low frequency Raman and inelastic neutron scattering from glass-forming aqueous lithium chloride (LiCl,4H2O; LiCl,6H2O) are compared. The measurements were carried out from the vitreous to liquid states. The scattering from anharmonic oscillations (light scattering excess), which was separated from the one from harmonic vibrations, is zero in the vitreous state, and increases rapidly in the supercooled state. The frequency dependence of light-vibration coupling coefficient is linear for low-energy harmonic vibrations. It is different for anharmonic oscillations. From the frequency dependence of the density of vibrational states and the absence of light scattering excess in the glassy state, it is deduced that the structure is compact in the glassy state. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.469221
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  • 4
    Digitale Medien
    Digitale Medien
    Structural, vibrational, and optical properties of silicon cluster assembled films (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 4607-4613 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Distributions of neutral Si-clusters centered around mean sizes of 50 and 200 atoms have been produced using a laser vaporization source and deposited on various substrates at room temperature in ultrahigh vacuum. The Si-cluster assembled films obtained, resulting from the random stacking of incident free nanosize clusters, were subsequently coated by appropriate protective layers before removing in air to perform ex situ infrared, visible, Raman, and photoluminescence spectrometry measurements, as well as transmission electron microscopy observations. The main characteristics of the cluster films are comparable to those observed for amorphous hydrogenated silicon and quite different to those of conventional nanoporous structures or clusters larger than 2–3 nm. The observed intense photoluminescence signal and band gap suggest the presence of a low number of dangling bonds probably due to surface reconstruction effects, connections between adjacent clusters, and oxygen contamination. As for the oxygen contamination, infrared and x-ray photoemission spectrometry measurements agree with the assumption of oxygen atoms trapped at the cluster surface. Finally, all the results on the vibrational and optical properties tend to confirm the failure of the classical confinement model in a diamond lattice to explain the behavior of such nanostructured materials with grain size typically in the nanometer range. The presence of five-membered rings characteristic of the Si-cluster structures in this size range with the subsequent rehybridization effects, as well as the connection process between adjacent clusters seem to be a track which is discussed for a better interpretation of the results. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.475871
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  • 5
    Digitale Medien
    Digitale Medien
    Nanostructured silicon films obtained by neutral cluster depositions (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 107 (1997), S. 10278-10287 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Nanosize neutral silicon clusters produced using a laser vaporization source were analyzed in the gas phase and deposited on various substrates at room temperature in ultrahigh vacuum. Nanostructured thin films with thickness around 100 nm resulting from this nearly ballistic deposition process were subsequently characterized by several complementary electron spectroscopy techniques to investigate the electronic structure. The film properties are comparable to those of a disordered phase but different from the properties of conventional amorphous or nanoporous silicon. The specific features observed in the Si-cluster assembled films cannot be simply interpreted on the basis of quantum confinement effects and are rather attributed to the presence of odd-membered rings in the incident-free cluster structure. Some Si-cluster geometries in the subnanometric size range are proposed and discussed on the basis of the experimental results and a tight binding scheme. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.474168
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  • 6
    Digitale Medien
    Digitale Medien
    H-bond and glassy state formation. A structural and dynamic study applied to aqueous solutions
    Amsterdam : Elsevier
    Journal of Molecular Structure 322 (1994), S. 141-149 
    Details
    ISSN: 0022-2860
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-2860(94)87028-4
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  • 7
    Digitale Medien
    Digitale Medien
    Collective dynamical aspect related to vitrification in connection with structural characterization
    Amsterdam : Elsevier
    Physica A: Statistical Mechanics and its Applications 201 (1993), S. 312-317 
    Details
    ISSN: 0378-4371
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0378-4371(93)90428-7
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  • 8
    Digitale Medien
    Digitale Medien
    Electronic and Atomic Structure of Large Covalent and Metal Clusters: Applications to Cluster Assembled Materials (1996)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 232 (Nov. 1996), p. 27-50 
    Details
    ISSN: 1662-9752
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/02/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.232.27.pdf
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  • 9
    Digitale Medien
    Digitale Medien
    AuSb2 alloy formation on HOPG by successive deposition of Sb clusters and Au atoms (1999)
    Springer
    The European physical journal 9 (1999), S. 513-516 
    Details
    ISSN: 1434-6079
    Schlagwort(e): PACS: 61.46.+w Clusters, nanoparticles, and nanocrystalline materials – 61.16.Bg Transmission, reflection and scanning electron microscopy (including EBIC) – 61.82.Bg Metals and alloys
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract. The behaviour of gold atoms that alloy into amorphous antimony (aSb) islands is studied by transmission electron microscopy (TEM), selected-area electron diffraction (SAED), and energy dispersive X-ray spectroscopy (EDS). In a first step, antimony thin films are produced by low-energy cluster beam deposition (LECBD). The antimony clusters (of diameter ≈5 nm, with 2300 atoms) are generated in a thermal source by the gas aggregation technique and deposited onto highly-oriented pyrolitic graphite (HOPG). For cluster submonolayer coverage (〈0.2 M.L.), the diffusion and interaction of clusters on substrate lead to the formation of amorphous ramified Sb islands, formed by the aggregation of spherical particles about 10 nm in diameter. In a second step, gold is vapour-deposited onto the aSb–HOPG substrate. The influence of gold atom deposition on the morphology of the islands is studied. Moreover, varying the gold thickness, we characterize the AuSb2 alloy formation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100530050490
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  • 10
    Digitale Medien
    Digitale Medien
    Plasmon-phonon coupling and resonant raman scattering of silver clusters (1999)
    Springer
    The European physical journal 9 (1999), S. 585-589 
    Details
    ISSN: 1434-6079
    Schlagwort(e): PACS: 36.40.-c Atomic and molecular clusters – 36.20.Ng Vibrational and rotational structure, infrared and Raman spectra – 63.20.Pw Localized modes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract. Absorption and low-frequency Raman scattering experiments have been performed on thin films consisting of small silver clusters embedded in a porous alumina matrix. When the Raman excitation wavelength is close to the maximum (≈420 nm) of the Mie band (dipolar surface plasmon resonance) the Raman spectra exhibit a strong band located around 10 cm-1, the maximum of which depends on the mean cluster diameter 〈D〉 in the sample according to the approximate law ωvib∝〈D〉-1. The Raman band corresponds to the excitation of the quadrupolar vibration mode of the clusters. Moreover, the maximum of the Raman band shifts towards lower frequencies when the excitation light is shifted to the red. This feature, as well as the rather large Mie-band width, is thought to reflect the ellipsoidal shape distribution of part of the embedded clusters.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100530050505
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