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  • 1
    Electronic Resource
    Electronic Resource
    The bending vibrational levels in C2D2 (X˜ 1Σ+g) (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 3407-3414 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Improved sets of data have been recorded and analyzed in order to study the bending rovibrational energy levels of C2D2, in the regions of the ν5–ν4 difference band (FIR) and of the ν5 fundamental band (IR). A matrix model is setup to deal with a Darling–Dennison coupling between sets of bending levels as well as with the usual l-type resonances. A simultaneous fit of the new data together with earlier microwave measurements produces an extended set of very accurate parameters, including for the first time in C2D2 s45 and qkt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459763
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  • 2
    Electronic Resource
    Electronic Resource
    Location and molecular motion of hexamethylbenzene in zeolite NaY (1993)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 97 (1993), S. 1629-1633 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100110a026
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  • 3
    Electronic Resource
    Electronic Resource
    Distribution and motion of organic guest molecules in zeolites (1993)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 97 (1993), S. 1622-1628 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100110a025
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  • 4
    Electronic Resource
    Electronic Resource
    Band offset determination in analog graded parabolic and triangular quantum wells of GaAs/AlGaAs and GaInAs/AlInAs (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 5004-5011 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The band offset parameter Qc = ΔEc/ΔEg for both GaAs/AlGaAs (lattice matched to GaAs), and GaInAs/AlInAs (lattice matched to InP) was extracted from the optical interband transition energies obtained from both triangular and parabolic quantum well shapes of various widths. The wells were grown using continuous analog compositional grading as opposed to the discrete, superlattice (digital) grading used by previous researchers. Electron beam electroreflectance (EBER) was the primary technique used to measure the interband transition energies. By combining the theoretical energies from quantum mechanical potential well calculations with EBER measured energies, it was possible to extract band offset values in a self-consistent manner. Qc values obtained were 0.658±0.009 and 0.650±0.001 for GaAs/AlGaAs and GaInAs/AlInAs, respectively. Measurements also revealed that Qc was both temperature and concentration independent within the range of composition studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350600
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  • 5
    Electronic Resource
    Electronic Resource
    Heterointerfaces in quantum wells and epitaxial growth processes: Evaluation by luminescence techniques (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 1 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This paper presents a review devoted to the problem of how optical and structural properties of quantum-well heterostructures (QWH) can be correlated in detail, and how these properties may be connected with the parameters of the epitaxial growth process. It demonstrates how luminescence techniques, mainly photoluminescence (PL) and cathodoluminescence imaging (CLI), may be used for evaluation of the structural disorder on the atomic scale, which occurs at the growth surfaces creating the interfaces of the QWH. The physics of the excitonic luminescence in QWH (theory and experiment) is presented in detail in the first part of the review. This is followed by a comprehensive discussion of experimental aspects (hardware and software) of the luminescence techniques, as applied for studying QWH grown by molecular-beam epitaxy (MBE) and metalorganic vapor phase epitaxy (MOVPE). The specific features of both the epitaxial growth techniques, when used for growing QWH are presented in the next part of this review. Finally, the possibilities of application of PL and CLI to studies on growth of QWH by MBE and MOVPE are demonstrated on a couple of selected examples. The review concludes with a short discussion on possible interpretation mistakes which may occur when one applies the CLI to studies of interfaces in QWH without taking into account the basic parameters of the excitonic luminescence lines creating the CL images of the relevant interfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349613
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  • 6
    Electronic Resource
    Electronic Resource
    Evaluation of growth temperature, refractive index, and layer thickness of thin ZnTe, MnTe, and CdTe films by in situ visible laser interferometry (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 998-1000 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The experimental procedure and the results of in situ determination of growth temperatures, refractive indices at growth temperatures, and thicknesses of ZnTe, cubic MnTe, and CdTe thin films grown by molecular beam epitaxy (MBE) are reported. Visible laser interferometry with He-Ne laser 0.6328-μm light has been applied in the performed experiments. A 290-μm-thick plane-parallel GaP wafer polished to an optical finish on both sides has been used as a growth temperature calibration standard. The exemplary substrate temperature calibration curves, as well as the data gained at dynamic thermal conditions are presented and discussed. The following numerical values concerning refractive indices n at elevated temperatures have been evaluated from experimental data for the MBE grown films: n (286 °C)ZnTe=2.51, n (175 °C)ZnTe=2.49, n(286 °C)cubic MnTe=3.26, and the extinction coefficient k (286 °C)CdTe=0.23.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112174
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  • 7
    Electronic Resource
    Electronic Resource
    Dynamics by Semiclassical Methods (1994)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Physical Chemistry 45 (1994), S. 83-111 
    Details
    ISSN: 0066-426X
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.pc.45.100194.000503
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  • 8
    Electronic Resource
    Electronic Resource
    Structure of dinitrato(2-thia-5,8-diazaoctane)copper(II) (1991)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 47 (1991), S. 1202-1204 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270190013919
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  • 9
    Electronic Resource
    Electronic Resource
    Variability of laminin immunoreactivity in human autopsy brain (1992)
    Springer
    Histochemistry and cell biology 97 (1992), S. 237-241 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Laminin immunoreactivity is thought to be masked in formalin-fixed sections since proteolytic treatment is required to unmask it. We analyzed this masking with frozen and formalin-fixed human autopsy brains obtained at various postmortem periods. In unfixed, frozen sections, intense immunoreactivity was invariably detected in vascular walls of entire sections. When such sections were postfixed in formalin, immunoreactivity was not diminished even after prolonged fixation. In vibratome sections of brain fixed in formalin in situ, immunoreactivity varied with postmortem delay: in most cases, immunoreactivity was weak and restricted to superficial cortical layers. However, the extent of immunoreactivity increased with postmortem delay. Two cases fixed after prolonged postmortem periods revealed moderate immunoreactivity throughout the sections. We also investigated rat brains processed without postmortem delay. In unfixed frozen sections, immunoreactivity again was observed throughout the sections, independent of the length of any postfixation. In vibratome sections of fixed rat brain, immunoreactivity was restricted to the cutting margins of the brain blocks and around a trauma-induced cortical lesion, regardless of how long the blocks had been kept in fixative. Our data suggest that postmortem proteolysis accomplishes similar unmasking of laminin antigen as digestion on paraffin sections and that such unmasking can also be effected by proteolysis induced by damaging tissue during cryostat sectioning of fresh tissue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00267633
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  • 10
    Electronic Resource
    Electronic Resource
    Copolymerization of a polyhydrocarbon macromonomer with methyl acrylate and acrylonitrile in the presence of a lewis acid (1994)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 45 (1994), S. 413-418 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The free radical copolymerization of a vinyl-terminated hydrocarbon macromonomer, namely poly-l-butene with molecular weight 1,000, with methyl acrylate (MA) led to copolymers with broad molecular weight distributions, and even bimodal character. In the presence of alkylaluminum chloride Lewis acids, higher incorporation of MA was obtained. The polymer MW and mole% MA in the copolymer increase with their decreasing Lewis acid strength. The best result was obtained in the presence of 25 mole% Et2AlCl versus MA at 60°C which led to 82% of the polyhydrocarbon chains being derivatized and unimodal MW distribution. For the copolymerization of the polyhydrocarbon macromonomer and AN, the best results were obtained without Lewis acid in toluene using a free radical initiator at 125°C. The model compound 2,2,4-trimethyl-1-pentene copolymerizes with both MA and AN in standard free radical conditions and the copolymerization parameters were determined.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1994.010450602
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