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  • 1990-1994  (8)
  • 1985-1989  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Electron-induced vibrational spectroscopy. A new and unique tool to unravel the molecular structure of polymer surfaces (1991)
    s.l. : American Chemical Society
    Langmuir 7 (1991), S. 2433-2437 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00059a006
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Structural origin of surface morphological modifications developed on poly(ethylene terephthalate) by excimer laser photoablation (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 365-370 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The ablation of poly(ethylene terephthalate) (PET) by Ar-F laser radiation has been studied at different fluences for amorphous and semicrystalline samples by scanning electron microscopy (SEM) and by etch-depth measurements. The surface structure created on PET has been interpreted as resulting mainly from a difference in the etch rate—and not the ablation threshold—between amorphous and semicrystalline PET. SEM pictures clearly show the melting of the PET surface at high fluence (≥80 to 100 mJ/cm2) and not below that value. UV laser etching is proposed as a quick and easy method for observing the crystalline subsurface structure of aromatic semicrystalline polymers, as long as low fluence and a low pulse repetition rate are used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341436
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Surface analysis of polyethylene and hexatriacontane by high resolution electron energy loss spectroscopy (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 6452-6457 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Surfaces of polyethylene and n-hexatriacontane were for the first time studied by high resolution electron energy loss spectroscopy (HREELS). The vibrational band energies and intensities were recorded and compared to transmission infrared data. The attribution of most of the bands to methyl, methylene, and C–C vibrations is straightforward; but some of the bands remain unassigned. The intensities of the methyl associated electron energy losses are greatly enhanced. This confirms the extreme surface sensitivity of the spectroscopy and is consistent with a C–C skeleton preferentially oriented perpendicular to the surface. Measured cross section data vs electron impact energy (E0) show that while a dipolar-type interaction mechanism is dominating some regions of the cross-section curve, other resonance scattering may contribute significantly for low and high E0. This cross-section curve shows also that the polymer surfaces are to be considered as a "condensed gas,'' with weak intermolecular interaction, instead of a real solid state material with collective (phonon) vibrational excitations. No evidence of radiation damage could be found in the vibrational spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450852
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The aluminum–polyimide interface: An electron-induced vibrational spectroscopy approach (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 3353-3362 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Clean polyimide films spin-coated onto gold substrate have been fully characterized by high resolution electron energy loss spectroscopy (HREELS): 19 electron-induced vibrational bands could be resolved and assigned by comparison with IR spectroscopy. The attribution of these peaks constitutes a firm and necessary basis for the detailed study of the incipient interface formation with aluminum at room temperature. The metal being evaporated at a low rate from a Knudsen effusion cell, its equivalent coverage on the polymer could be monitored very efficiently and allowed a clear distinction between three reaction steps: (i) at an Al coverage below 4×1014 Al atom/cm2, the aluminum atoms interact only with the C–O carbonyl in the polymer to form a C–O–metal complex; (ii) between 4 and 10×1014 atom/cm2, no further Al "reaction'' occurs, but the appearance of new CH and OH stretching bands is attributed to bond breaking in the polymer and diffusion of the residues towards the surface; (iii) after further metal evaporation, all the peaks reduce in intensity and the observation of a ν(Al–O) [or ν(Al–C) band] testifies the formation of an aluminum oxide (or carbide) at the surface. Although no dedicated theory can be invoked up to now for the interpretation of HREELS data collected with different electron impact energies and under different scattering geometries, the spectra measured from polyimide before and after aluminum condensation are consistent with a modification of the geometry of the polymer monomeric unit after bonding with the metallic atoms. The metallized polymer surface appears with an equal statistical spatial distribution of all the chemical groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453930
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    High resolution electron energy loss spectroscopy investigation of molecular conformation at the surface of poly(amino acid)s films (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 781-787 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Electron-induced vibrational spectra of four poly(amino acid)s—poly-alanine, poly-leucine, poly-methionine, and poly(benzyl-aspartate)—have been recorded. After discussing the surface sensitivity of the technique and the excitation mechanisms of the molecular vibrations, it is concluded that high resolution electron energy loss spectroscopy (HREELS) spectra are dominated by vibrational bands fingerprinting the polymer sidechains. From these observations, suggestions are made on the molecular conformation at the surface of these poly(amino acid)s films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468133
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    C60 growth on Si(100), GaSe(0001) and GeS(001) (1993)
    Springer
    Applied physics 56 (1993), S. 175-183 
    Details
    ISSN: 1432-0630
    Keywords: 68.55.−a ; 73.60.−n ; 79.20.Kz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract C60 films have been grown in ultra high vacuum on various crystalline substrates and the structure of the films has been investigated by low energy electron diffraction (LEED) and high resolution electron energy loss spectroscopy (HREELS). The C60 films form randomly oriented nanocrystals on Si(100), mesoscopic polycrystals on GaSe(0001) and microscopic single crystals on GeS(001). The vibrational structure of the C60/substrate interfaces is analyzed in detail by HREELS carried out in the dipole and impact scattering regimes. It is shown that the epitaxy of C60 on GeS(001) is induced by the weak van der Waals bonding and the peculiar corrugation of the substrate surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00539471
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Electron spectroscopic techniques applied to the study of InSb formation on heated Sb(111) surfaces (1987)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 329 (1987), S. 370-373 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The interface formation between Sb(111) single crystals and evaporated indium has been studied with various spectroscopic techniques. It is shown from an Auger intensity analysis that a layer-growth of InSb is obtained at 550 K. LEED is used to determine the overlayer atomic geometry. The InSb layer is ordered and a lattice parameter close to the value for InSb(111) is obtained. The InSb formation is confirmed by the chemical shift of the Sb 4d and In 4d core lines with XPS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00469174
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Water interactions in Al/PET (1990)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 15 (1990), S. 609-613 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Two cases of water interaction with virgin PET and with metallized (Al) PET were studied using thermal desorption spectroscopy (TDS) and dynamic secondary ion mass spectrometry (SIMS), respectively. On the one hand, the TDS approach tends to show that the water is weakly bound to the polyester (∼ 10 kcal mol-1); on the other hand, the SIMS study performed on metallized PET shows an enhancement of the water concentration around the interface. These results are discussed in order to elucidate the presence of such moisture and its influence on the metal/polymer adhesion and corrosion.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740151007
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    The formation of the copper/polyphenylquinoxaline interface: An HREELS study (1994)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 22 (1994), S. 483-484 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The interaction of copper with the surface of polyphenylquinoxaline is investigated with high resolution electron energy loss spectroscopy. The metal deposition is found to affect several features, in particular the elastic peak and the CH vibrational modes associated with the aromatic groups. Diffusion of copper to the bulk is observed upon thermal treatment.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.7402201102
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  • 10
    Electronic Resource
    Electronic Resource
    Analysis of semiconductors and insulators by high-resolution electron energy loss spectroscopy - prospects for quantificationInvited paper presented at the Quantitative Surface Analysis (QSA-5) Conference, London, 15-18 November 1988. (1990)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 15 (1990), S. 189-205 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: High-resolution electron energy loss spectroscopy (HREELS) is now widely known and recognized for its very significant contributions to the characterization of molecules adsorbed on well-defined surfaces: many chemical surface reactions were understood successfully (adsorption sites, reaction scheme, time-resolved experiments) through the analysis of electron-induced vibrational spectra. Semiconductors and insulators form other classes of materials that contribute to vibrational spectra by intrinsic vibrations: compound semiconductors, and insulators present acoustic and optical phonons, i.e. collective lattice vibrations, whereas organic insulators (like polymers) offer numerous molecular groups to the vibrational excitation by the electron beam (extrinsic vibrations). Quantitative analysis of the surface of those materials rests on the understanding of the interaction mechanisms between monochromatized electrons and intrinsic or extrinsic vibrations.Three scattering processes have been recognized to contribute to HREEL spectra: dipole interaction, impact scattering and resonance scattering. They have been characterized theoretically and experimentally through their dependence versus variation of the electron beam energy and/or of the scattering angular geometry.Recent experiments have shown that the analysis of intrinsic phonons is very well understood for insulators. As a consequence, quantitative analysis of compound semiconductors is possible and brings additional information on the surface stoichiometry (of AlxGa1-xAs, for example) and on the doping level. For organic polymers, however, the excitation of molecular vibrations does not - up to now - appear to follow a simple scheme: all the scattering mechanisms (dipolar, impact and resonance) appear to play a significant role; a true quantification will be possible only through a systematic study of model compounds, and will require further theoretical treatments.
    Additional Material: 21 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740150302
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