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  • 1990-1994  (5)
  • 1965-1969
  • 1940-1944
  • 1994  (3)
  • 1993  (2)
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  • 1990-1994  (5)
  • 1965-1969
  • 1940-1944
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Photoluminescence and Raman studies of porous silicon in polymethyl methacrylate (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 613-615 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the observation of strong luminescence from porous Si grains containing Si nanocrystallites embedded in polymethyl methacrylate disks. In concentrated samples, forward and backscattered photoluminescence spectra were just as strong as in porous Si on Si wafers. This new result indicates that porous Si grains could be embedded in nonconducting polymers and would retain all its inherent characteristics as in porous Si layers on Si wafers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111066
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Light-emitting porous silicon diode with an increased electroluminescence quantum efficiency (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 2700-2702 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The fabrication technology and the properties of a light-emitting device including a porous pn junction are presented. We employ the selective formation of different kinds of porous silicon substructures caused by the doping level and the illumination during anodization. The device has a nanoporous light-emitting n layer between a mesoporous p+-doped capping layer and the macroporous n substrate. The pn junction formed in this way has strong rectifying characteristics. It shows bright red-orange light emission under forward bias. Compared to simple metal-porous silicon devices, the structure has an increased quantum efficiency (factor 10–100).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109236
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Skeletal metastases from a pineoblastoma (1994)
    Springer
    European radiology 4 (1994), S. 584-586 
    Details
    ISSN: 1432-1084
    Keywords: Pineal body, neoplasms ; Bone neoplasms, secondary
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A case of histologically proven skeletal metastases from pineoblastoma is presented. The primary tumor was initial1y treated by surgery and radiotherapy. To the best of our knowledge this is the third reported case of skeletal metastases arising from such primary tumor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226836
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The electronic structure of KMnO4 investigated by photoemission and electron-energy-loss spectroscopy (1994)
    Springer
    The European physical journal 94 (1994), S. 431-438 
    Details
    ISSN: 1434-6036
    Keywords: 79.60 ; 71.20 ; 71.28
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract From photoemission and electron-energy-loss data the following picture of KMnO4, with MnVII (with a formal charge state Mn7+ (3d 0)) tetrahedrally surrounded by four O2−-ions, is deduced: strong covalent bonding between MnVII and O2− leads to a considerable occupation of the Mn-3 d shell. The ground state of the (MnO4)−1 molecule is an orbital and spin singlet as seen by the absence of any multiplet splitting in the Mn core levels. The valence band shows a four peak structure extending form 4 eV to 8 eV below the Fermi energy. The first peak at 4.2 eV has mainly O-2p character. The remaining peaks are of strongly mixed Mn-3d/O-2p character due to the covalent bonding. This mixing decreases with increasing binding energy. The electron energy loss data show a variety of structures between 2 eV and 10 eV independent of the primary electron energy which defines them as dipole allowed charge-transfer transitions. An additional excitation at 1.8 eV decreases quickly in intensity with increasing electron energy which classifies it as a dipole or spin forbidden transition in the compound. This energy is close to the value of 1.6 eV reported for the activation energy observed in electrical transport data. The results are compared to quantum chemical molecular orbital calculations of the (MnO4)−1 molecule.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01317405
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    133. Poröses Silicium - ein Material der Mikrosystemtechnik (1993)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 65 (1993), S. 1132-1133 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.3306509135
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    Paper (German National Licenses)
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