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  • 1
    Digitale Medien
    Digitale Medien
    Thermally induced optical bistability in ZnSe epilayers grown by molecular-beam epitaxy (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 2532-2534 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: For the first time, ZnSe epitaxial layers grown by molecular-beam epitaxy are shown to exhibit large contrast, low power, and extremely long-term stable thermally induced absorptive optical bistability. It is observed over a wide temperature range between 169 K and RT, with a strongly variable loop width and a switch-back adjustable to be less than 50% of the respective switch-down value. Critical slowing down as well as switch-down times are studied in dependence of the excess over the switch-down intensity values.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.346475
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  • 2
    Digitale Medien
    Digitale Medien
    Comparative optical investigations of ZnSe/GaAs epilayers grown by molecular beam and hot-wall epitaxy (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 5630-5635 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Comparative photoluminescence and excitation spectra of ZnSe/GaAs epilayers grown by molecular beam epitaxy (MBE) and hot-wall epitaxy (HWE) show likewise features in the exciton energy regime. Two strain-split components of the free exciton are observed, as well as characteristic sets of transitions from or into ground and excited states of acceptor- and donor-bound excitons. However, all respective lines are shifted to lower energies in the HWE samples, due to the increased thermally induced strain as a consequence of the substrate temperatures being enhanced compared to the MBE growth. Whereas the dominant donors are of the same nature in both kinds of samples, specific acceptor centers are incorporated in the HWE films. Although the MBE-grown layers are of superior quality, it is shown that HWE under optimized growth conditions is a cheap and useful alternative to obtain ZnSe epilayers of reliable properties.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.346975
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  • 3
    Digitale Medien
    Digitale Medien
    Ultraviolet and blue holographic lithography of ZnSe epilayers and heterostructures with feature size to 100 nm and below (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 2641-2643 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We have employed short-wavelength holographic laser lithography and reactive ion etching to define wire and dot-like patterns in ZnSe thin epitaxial films and heterostructures with spatial feature size to better than 100 nm. Photoluminescence measurements suggest that surface damage from etching may be much less severe than in III-V semiconductors.〈hedend〉
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.103810
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  • 4
    Digitale Medien
    Digitale Medien
    Zinc-blende MnTe: Epilayers and quantum well structures (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 2087-2089 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Epilayers of the previously hypothetical zinc-blende MnTe have been grown by molecular beam epitaxy. Epitaxial layers (0.5 μm thick) of MnTe were characterized using x-ray diffraction and transmission electron microscopy; optical reflectance measurements indicate a band gap of ∼3.2 eV. A series of strained single quantum well structures was fabricated with zinc-blende MnTe forming the barrier to CdTe quantum well regions; photoluminescence spectra indicate optical transitions corresponding to strong electron and hole confinement.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.102091
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  • 5
    Digitale Medien
    Digitale Medien
    Pseudomorphic ZnTe/AlSb/GaSb heterostructures by molecular beam epitaxy (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 268-270 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A series of pseudomorphic ZnTe/AlSb/GaSb epilayer/epilayer heterostructures, aimed at the realization of novel wide band-gap light-emitting devices, was grown by molecular beam epitaxy. The structures were evaluated by several techniques including transmission electron microscopy (TEM), x-ray rocking curves, photoluminescence (PL), and Raman spectroscopy. Reflection high-energy electron diffraction intensity oscillations were observed during nucleation of ZnTe. The presence of dislocation-free pseudomorphic structures was confirmed by TEM. The PL spectra of ZnTe epilayers showed dominant near-band-edge features composed of free and shallow impurity bound excitons.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.101925
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  • 6
    Digitale Medien
    Digitale Medien
    PROTEIN CRYSTALLIZATION (1996)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Physical Chemistry 47 (1996), S. 171-204 
    Details
    ISSN: 0066-426X
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Chemie und Pharmazie , Physik
    Notizen: Abstract Crystallization is necessary to obtain the three-dimensional structure of proteins and nucleic acids; it often represents the bottleneck in structure determination. Our understanding of crystallization mechanisms is still incomplete. In this review, we emphasize fundamental aspects of the crystallization process. Protein-protein contacts in crystals are complex, involving a delicate balance of specific and nonspecific interactions. Depending on solution conditions, these interactions can lead to nucleation of crystals or to amorphous aggregation; this stage of crystallization has been successfully studied by light scattering. Post nucleation crystal growth may proceed by mechanisms involving crystal defects or two-dimensional nucleation, as observed by atomic force and interference microscopy. Cessation of growth has been observed but remains incompletely understood. Impurities may play important roles during all stages of crystallization. Phase diagrams can guide optimization of conditions for nucleation and subsequent crystal growth; a theoretical understanding relating these to the intermolecular interactions is beginning to develop.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.physchem.47.1.171
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  • 7
    Digitale Medien
    Digitale Medien
    Occurrence of the 15-hydroxy derivative of dihomogammalinolenic acid in human platelets and its biological effect
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Lipids and Lipid Metabolism 962 (1988), S. 149-154 
    Details
    ISSN: 0005-2760
    Schlagwort(e): (Human) ; Cyclooxygenase ; Lipoxygenase ; Platelet aggregation
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie , Chemie und Pharmazie , Medizin , Physik
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2760(88)90106-3
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  • 8
    Digitale Medien
    Digitale Medien
    Grazing-incidence Bragg–Laue X-ray diffraction (1989)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 45 (1989), S. 132-141 
    Details
    ISSN: 1600-5724
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: Internal waves excited by the dynamical diffraction of X-rays from a single set of crystal planes perpendicular to the incidence surface can produce both Bragg diffracted and reflected beams and Laue diffracted and transmitted beams for crystal slabs of finite thickness. The excitation of Bragg and Laue beams for grazing-incidence diffraction geometries is investigated experimentally and theoretically. The traditional dispersion surface picture for describing allowed internal and external wave vectors is developed to illustrate how the Bragg and Laue beams arise. Experiments performed on a thin silicon wafer demonstrate the evolution of the Laue beams from the back surface into Bragg beams at the front surface of the crystal. The results are in good agreement with calculated curves obtained from the 'n-beam' diffraction theory of Colella [Acta Cryst. (1974), A30, 413- 423]. This theory is shown to be very useful for grazing-incidence excitations because of its completely general treatment of Bragg and Laue beams, and the exact numerical nature eliminates the need for approximations. Experiments also reveal how the presence of a 40 Å AuPd layer on the incidence surface suppresses the Bragg-diffracted beam but not the specular and Laue beams.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0108767388010657
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  • 9
    Digitale Medien
    Digitale Medien
    Darwin spherical-wave theory of kinematic surface diffraction (1995)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 51 (1995), S. 258-268 
    Details
    ISSN: 1600-5724
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: In 1912, von Laue first described X-ray diffraction by approximating as plane waves the spherical waves radiated by atoms in a crystal. Darwin recognized that this approximation is valid only in the limit of very small crystals, and published in 1914 the more general spherical-wave theory based on the reflectivity of individual atomic planes. The Darwin theory is extended here to surface Bragg diffraction from a single-crystalline monolayer, including the rederivation of a `surface' Bragg's law and the reflected intensity versus \varphi, the angle of incidence. This more general theory demonstrates how the intensity along a reciprocal-lattice rod associated with diffraction from a semi-infinite crystal is modified by the \varphi dependence of the length over which atoms in a plane emit spherical waves that constructively interfere at the detector. The diffracted amplitude is not proportional to the Fourier transform of the charge density. The plane- and spherical-wave models yield identical results for the integrated intensity across a finite detector area, even for incident angles far from a Bragg reflection.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0108767394010548
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  • 10
    Digitale Medien
    Digitale Medien
    Spectroscopy in CdTe/MnTe and ZnTe/MnTe single quantum wells; new binary wide gap II-VI heterostructures
    Amsterdam : Elsevier
    Journal of Crystal Growth 101 (1990), S. 628-631 
    Details
    ISSN: 0022-0248
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-0248(90)91050-Z
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