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  • 1
    Electronic Resource
    Electronic Resource
    X-Ray Absorption Study of Highly Oriented Poly(tetrafluoroethylene) Thin Films (1994)
    s.l. : American Chemical Society
    Langmuir 10 (1994), S. 4399-4402 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00024a001
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Electronic transitions in α-oligothiophene thin films. Comparison of ultraviolet/visible absorption spectroscopy and high resolution electron energy loss spectroscopy investigations (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 6344-6352 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Vapor deposited thin films of a series of α-oligothiophenes are investigated comparatively with polarized ultraviolet/visible absorption spectroscopy (UV/VIS) and by high resolution electron energy loss spectroscopy (HREELS) in specular reflection geometry. The complementary selection rules of these methods allow an assignment of the observed absorption and loss bands according to a Hückel molecular orbital model. By plotting the transition energies of corresponding bands of different members of the homologous series vs the reciprocal of the number of rings, the development of the one-dimensional "π-band-structure'' with an increasing number of rings could be followed. The extrapolation to infinite chain length leads to the electronic properties of an ideal (defect free) polythiophene. Furthermore, characteristic differences were observed in the results obtained from the two methods. The orientation of the molecules in thin films is only detectable with UV/VIS spectroscopy. It is most pronounced for α-quinquethiophene. On the other hand, HREELS gives information about the position of optical parity forbidden electronic transitions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468458
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Thickness shear mode resonators (“mass-sensitive devices”) in bioanalysis (2000)
    Springer
    Fresenius' journal of analytical chemistry 366 (2000), S. 602-610 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A short overview of function and experimental set-ups of acoustic wave devices is given which, in contrast to other bioanalysis techniques, are based on a mechanical transduction mechanism. The most frequently used device is the thickness shear mode resonator (TSMR), which in the last few years was intensively employed in biosensor applications. TSMR biosensor studies in the field of nucleic acid interaction, adsorption of proteins to surfaces and immunosensing are reviewed. A main point concerns the interpretation of the sensor response not only in terms of mass loading, which underestimates the capabilities of these devices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160051555
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Bf-Immunfixation auf Cellogel-Folien (1981)
    Springer
    Annals of hematology 42 (1981), S. 23-26 
    Details
    ISSN: 1432-0584
    Keywords: Bf-Immunfixation ; Cellogel-Folien ; Bf-Genfrequenzen ; Bf-immunofixation ; Cellogel membranes ; Bf gene frequencies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary A method for the determination of Bf phenotypes by means of immunofixation after electrophoresis on cellogel membranes is reported. In comparison to immunofixation after agarose gel thinlayer electrophoresis, this method shows an equal separation quality, but requires only about 1/5 of the monospecific anti-Bf serum, and results can be obtained after only 5 h. The gene frequencies calculated from our material (Bfs 0.7994, BfF 0.1850, BPs0,7 0.0085, BfF1 0.0071) are in good accordance with investigations about other European populations.
    Notes: Zusammenfassung Es wird eine Methode zur Darstellung der Bf-Phänotypen mit Hilfe der Immunfixation nach Elektrophorese auf Cellogel-Folien mitgeteilt. Dabei wird bei gleicher Trennqualität wie bei der Immunfixation nach Agarosegel-Dünnschichtelektrophorese nur etwa 1/5 des monospezifischen Antiserums benötigt und die Zeit bis zum Vorliegen der Ergebnisse beträgt nur etwa 5 h. Die Genfrequenzen aus unserem Untersuchungsmaterial (Bfs 0,7994, BfF 0,1850, Bfs0,7 0,0085, BfF1 0,0071) stimmen mit denen aus Mitteilungen für andere europäische Populationen gut überein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01080260
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  • 5
    Electronic Resource
    Electronic Resource
    Photoemission study of the Ba core levels in YBa2Cu3O7-x (1990)
    Springer
    The European physical journal 81 (1990), S. 349-353 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Angle dependent X-ray photoemission spectra of epitaxial thin YBa2Cu3O7-x films show characteristic differences after various heat and oxygen pretreatments. The component with the lowest binding energy in Ba 3d 5/2 and 4d 5/2 peaks results from bulk Ba in YBa2Cu3O7-x . A component with 2 eV higher binding energy results from Ba in the surface unit cell with different bonding if compared with the bulk superconductor. This surface structure is observed for all YBa2Cu3O7-x surfaces which have been exposed to oxygen. It is not observed for UHV prepared surfaces after mechanical scraping or fracturing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01390814
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  • 6
    Electronic Resource
    Electronic Resource
    Non-superconducting and rendered superconducting YBa2Cu3O7−x . An in-situ photoemission study (1990)
    Springer
    The European physical journal 79 (1990), S. 169-172 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present X-ray photoemission spectroscopy (XPS) results obtained on polycrystalline YBa2Cu3O7−x in the non-metallic (x〉0.6) and metallic state (x〈0.6) by an in-situ oxygen deloading/loading procedure, thus avoiding uncontrolled surface contaminations. The transition to the metallic (superconducting) state is characterized by corresponding changes in the O1s and Cu2p photoelectron lineshapes being in accordance with charge transfer from CuO2 planes to CuO chains. In particular, a peak at 531.1 eV binding energy is related to the presence of oxygen hole states (O−).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01406579
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    Paper (German National Licenses)
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