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  • 1
    Electronic Resource
    Electronic Resource
    Structure and stability of Langmuir-Blodgett films investigated by scanning force microscopy (1992)
    s.l. : American Chemical Society
    Langmuir 8 (1992), S. 2255-2261 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00045a030
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  • 2
    Electronic Resource
    Electronic Resource
    First integrals for the equations of motion for test particles with internal structure (1991)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 32 (1991), S. 2473-2477 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: In the framework of a general Lagrangian approach to the equations of motion for test particles with internal structure symmetry conditions and the corresponding conserved quantities are derived. As simple examples, first integrals of the equations of geodesic deviation, the Mathisson–Papapetrou and the Wong equations are rediscovered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.529176
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  • 3
    Electronic Resource
    Electronic Resource
    Quality of AlAs-like and InSb-like interfaces in InAs/AlSb superlattices: An optical study (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 2274-2276 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Two short-period InAs/AlSb superlattices, grown with an AlAs-like interface and an InSb-like interface, respectively, were studied with Raman spectroscopy, x-ray diffraction, and ellipsometry. Our measurements show that the InSb-like interface grows perfectly pseudomorphically, whereas the sample with the AlAs-like interface shows indications of relaxation and As interdiffusion. This different interface quality seems to be a fundamental problem, rather than the result of the growth technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109393
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  • 4
    Electronic Resource
    Electronic Resource
    Nanometer-size surface modifications with preserved atomic order generated by voltage pulsing (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 1039-1041 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on the generation of atomically resolved nanometer-size surface modifications by applying voltage pulses at predefined locations on the surface of the layered semiconductor tungsten diselenide (WSe2). Time-stable structures with diameters between 8 nm and less than 1 nm have been reproducibly written both in air and under vacuum. For small diameters, the resulting structures have the shape of mounds, whereas for diameters in excess of about 4 nm, a ring-like appearance is observed. In both cases, the atomic order of the formerly undisturbed surface is preserved and no defects in the lateral atomic order of the surface layer are found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104416
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  • 5
    Electronic Resource
    Electronic Resource
    P185erbB-2 im Serum von Ovarialakrzinompatientinnen (1993)
    Springer
    Archives of gynecology and obstetrics 254 (1993), S. 955-957 
    Details
    ISSN: 1432-0711
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Schlußfolgerung - Erhöhte Serumspiegel des p185erbB-2 Onkoproteins können mit einem EIA bei einzelnen Ovarialkarzinompatientinnen gemessen werden. - Wegen des seltenen Vorkommens versprechen p185erbB-2 Serumkonzentrationen keinen klinischen Nutzen bei der Identifikation oder Verlaufskontrolle von high-risk Patientinnen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02266254
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  • 6
    Electronic Resource
    Electronic Resource
    Dynamics and thermalization in violent collisions between40Ar and Ag at 27 MeV/nucleon (1991)
    Springer
    The European physical journal 340 (1991), S. 63-77 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.Gh ; 25.70.Jj ; 25.70.Lm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract For the violent collisions of 27 MeV/nucleon40Ar with Ag, coincidence measurements have been made between heavy residues and intermediate mass fragments (3≦Z≦14) or light charged particles. From the analysis of the correlation between heavy residues (mass and velocity) and intermediate mass fragments, the main characteristics of the dominant mechanisms, fusion and partially damped collisions preceded or accompanied by a preequilibrium emission, are presented. Balances concerning mean values of parallel linear momentum, mass and atomic number, are established and confirm that a complete description of violent collisions was obtained. Then thermalization is discussed, first in terms of excitation energies derived from kinematics between heavy residues and intermediate mass fragments, and secondly in terms of initial temperature estimates derived from light charged particle spectra. Very hot nuclei (T⋍5.7–6.6 MeV) are produced over a large impact parameter range from very central collisions to medium peripheral ones. Various experimental results are compared to predictions obtained with semi-classical calculations (Landau-Vlasov equation). From their good agreement one may conclude that, depending on the impact parameter, thermal equilibrium is achieved within 4–10×10−22 s.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01284482
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  • 7
    Electronic Resource
    Electronic Resource
    Molecular resolution of Langmuir-Blodgett monolayers on tungsten diselenide by scanning tunneling microscopy (1990)
    Springer
    The European physical journal 80 (1990), S. 389-392 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Langmuir-Blodgett (LB) monolayers of 22-tricosenoic acid deposited on layered tungsten diselenide (WSe2) have been investigated by Scanning Tunneling Microscopy (STM) in air. Reproducible molecular scale imaging of extended areas (16×16 nm) of the films was possible over more than two months after preparation. This indicates a high stability of the films on this type of polar substrates. The two-dimensional lattice of the organic film is incommensurate to the lattice of the WSe2 substrates. The STM experiments also indicate that the tip partially penetrates the organic film without destroying the film structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01323521
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  • 8
    Electronic Resource
    Electronic Resource
    Characterization of poly(1-butene) surfaces by scanning tunneling microscopy (1991)
    Springer
    Polymer bulletin 26 (1991), S. 95-100 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Poly(1-butene) (PB-1) films drawn from the melt have been deposited on highly oriented pyrolytic graphite (HOPG) substrates for investigation with the scanning tunneling microscope (STM). The STM investigations showed images of PB-1 flakes extending over some hundred nanometers. Their thickness was determined to be much larger than the normal tunneling distance established between the tip and a good conducting (metallic) sample surface. Close to monomolecular film steps, our STM measurements simultaneously revealed both the atomic resolution of the HOPG substrate and a superlattice showing an ordered structure pseudomorphic to the helical nature of the PB-1 macromolecule.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00299353
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  • 9
    Electronic Resource
    Electronic Resource
    High-resolution STM-imaging of highly oriented ultra thin poly(ethylene) films (1991)
    Springer
    Polymer bulletin 27 (1991), S. 101-107 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Poly(ethylene) (PE) ultra thin films drawn from the melt have been deposited on highly oriented pyrolytic graphite (HOPG) substrates for an investigation with the scanning tunneling microscope (STM). Similar to earlier examinations of poly (1-butene) (PB-1) ultra thin films (1), the STM investigations exhibited images of PE flakes extending over some hundered nanometers. Their thickness was determined to be much larger than the normal established tunneling distance between the tip and a good conducting (metallic) sample surface. It is supposed that the STM-tip penetrates the film and reduces its thickness by scanning over the film. Thus, a destruction of the film is likely leaving only a monomolecular layer of PE macromolecules on the graphite surface. At higher resolutions an ordered structure pseudomorphic to the simple chain nature of the PE macromolecule is revealed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00296332
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  • 10
    Electronic Resource
    Electronic Resource
    Projectile break-up with two outgoing intermediate-mass fragments in 26 AMeV32S+197Au (1993)
    Springer
    The European physical journal 345 (1993), S. 29-35 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.Lm ; Mn
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Correlations between two intermediate-mass fragments resulting from 840 MeV32S projectiles interacting with197Au were measured. The angular correlations and absolute two-fragment cross sections agree with predictions of a semi-microscopic model for direct dynamic projectile break-up. This suggests a predominantly direct mechanism for the production of intermediate-mass fragment pairs. It is argued that the intensity of such a channel which, compared to decays yieldingα particles, is much larger than observed for the sequential decay of corresponding primary excited nuclei, supports the direct-break-up interpretation. The model mechanism yields also strongly damped projectile fragments of intermediate mass.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290336
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