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  • 1
    Electronic Resource
    Electronic Resource
    Heterometal cuboidal clusters MFe4S6(PEt3)4Cl (M = vanadium, molybdenum): synthesis, structural analysis by crystallography and EXAFS, and relevance to the core structure of the iron-molybdenum cofactor of nitrogenase (1993)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 115 (1993), S. 5549-5558 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00066a024
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  • 2
    Electronic Resource
    Electronic Resource
    New statistics for mixing system of bosons and fermions
    Amsterdam : Elsevier
    Physics Letters A 170 (1992), S. 280-282 
    Details
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9601(92)90254-J
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  • 3
    Electronic Resource
    Electronic Resource
    Grey scale memory in an optically addressed spatial light modulator with a Lu(Pc)2 doped layer (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 765-767 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An optically addressed spatial light modulator with electrolyte bisphtalocyanine of lutetium incorporated in the alignment layer is shown to be capable of memorizing a grey scale image. The relationship between the memorized grey scale and the illumination is shown. The temperature, the concentration of Lu(Pc)2 and the spontaneous polarization of liquid crystals are found to have the effect on the memorization rate. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120887
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  • 4
    Electronic Resource
    Electronic Resource
    Fine structure of DX(Sn) centers in AlxGa1−xAs (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 2497-2500 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High resolution Laplace defect spectroscopy was used to study the fine structure of the electron emission process of DX(Sn) centers in AlxGa1−xAs (x=0.26,0.53). Two groups of peaks in the spectra of electron emission rates were found to correspond to two DX-like centers observed by deep level transient spectroscopy. The line splitting in both groups derives from the alloy disorder effect attributed to the different local configurations of Al and Ga atoms around two DX-like centers. Experimental evidence for the microscopic nature of two DX-like centers in Sn-doped AlGaAs is provided. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.368614
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  • 5
    Electronic Resource
    Electronic Resource
    Structural determination of titanium-oxide nanoparticles by x-ray absorption spectroscopy (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 80 (2002), S. 2973-2975 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: To understand and improve the applications of titanium-oxide nanoparticles, it is extremely important to perform a detailed investigation of the surface and the interior structural properties of nanocrystalline materials, such as rutile and anatase with diameter of few nanometers. Here, x-ray absorption spectroscopy has been used to identify the local Ti environment and characterize the related electronic structure. We combine experimental results at the Ti K edge in both bulk and nanocrystal samples to determine the lattice distortion via the characteristic pre-edge features and the variation in the multiple-scattering region of the x-ray absorption near-edge structure spectra. The correlation between peak intensities and surface-to-volume ratio of nanoparticles is also discussed. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1470699
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  • 6
    Electronic Resource
    Electronic Resource
    NEXAFS multiple scattering calculations of KO2 (2001)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 8 (2001), S. 719-721 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Since many years the oxidation of alkali metals has being attracted much interest due to the catalytic properties of metal promoters and the simple electronic structure of alkali atoms. The alkali-oxides phase diagram indicates that the interaction of oxygen with alkali metals can lead to the formation of different atomic O2- ions and molecular O2- and O22- ions. Potassium superoxide has been prepared in situ and high resolution O k-edge absorption NEXAFS spectra have been measured at the VUV beam-line at ELETTRA facility. The experimental data have been analyzed by multiple scattering approach deriving many geometrical and electronic details. In particular, we have found that the growth material structure is of the KO2 type with an O-O distance of about 1.35Å and that the transition involving single π molecular empty state of the superoxide O2- anion has a fine structure. Multiple Scattering self consistent calculation indicates that the bond between oxygen anion and K atom is totally ionic and that the fine structure is essentially due to solid state effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0909049501000206
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  • 7
    Electronic Resource
    Electronic Resource
    The local structure of Ca-Na pyroxenes. II. XANES studies at the Mg and Al K edges (1999)
    Springer
    Physics and chemistry of minerals 27 (1999), S. 20-33 
    Details
    ISSN: 1432-2021
    Keywords: Key words Ca-Na pyroxenes ; XANES ; Mg and Al K-edges ; Synchrotron Radiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract X-ray absorption spectra at the Mg and Al K edges have been recorded using synchrotron radiation on synthetic end member diopside (Di) and jadeite (Jd) and on a series of natural Fe-poor Ca-Na clinopyroxenes compositionally straddling the Jd-Di join. The spectra of C2/c end members and intermediate members of the solid solution series (C-omphacites) are different from those of the intermediate members having P2/n symmetry (P-omphacites). Differences can be interpreted and explained by comparing the experimental spectra with theoretical spectra calculated via the full multiple-scattering formalism, starting from the atomic positional parameters determined by single-crystal X-ray diffraction structure refinement on the same samples. Atomic clusters with at least 89 atoms, extending to more than 0.60 nm away from the Mg or Al absorbers, are needed to reproduce the experimental spectra. This shows that in the clinopyroxene systems XANES detects medium- rather than short-range order-disorder relationships. Theoretical spectra match the experimental ones well for all features in the regions from 16 to 60 eV above threshold. Experimental near-edge features in the first 16 eV are also reproduced, albeit less accurately. Certain near-edge features of C-omphacites reflect the octahedral arrangement of the back-scattering six O atoms nearest neighbours of the probed atom (Mg or Al) located at site M1 of the crystal structure, thus being indicators of short-range order. Others arise again from medium-range order. P-omphacites show more complicated spectra than C-omphacites. Their additional features reflect the increased complexity of the structure and the greater local disorder around the probed atom induced by the two alternative M1, M11 configurations of the six O atoms forming the first coordination shells. Mg and Al are confirmed to be preferentially partitioned in the M1 and M11 site of the P-omphacite crystal structure, however with a certain degree of local disorder. The relative heights of certain prominent features are directly related to sample composition in terms of Di:Jd ratio in the Al K-edge spectra, whereas they show abrupt variations in the Mg K-edge spectra. They demonstrate that XANES is directly related to composition and may be used to distinguish C- from P-omphacites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002690050236
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  • 8
    Electronic Resource
    Electronic Resource
    Hydrogenated amorphous silicon p-doping with diborane, trimethylboron and trimethylgallium (1992)
    Springer
    Applied physics 55 (1992), S. 573-581 
    Details
    ISSN: 1432-0630
    Keywords: 68.35.Fx ; 68.55.Ln ; 72.80.Ng
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The uses of diborane, trimethylboron and trimethylgallium gases have been systematically compared in order to obtain p-type hydrogenated amorphous silicon grown in silane rf glow discharges. The doping properties and the contamination effects due to the thermal CVD have been investigated by an in situ Kelvin probe. This study, which has been completed by electrical (dark conductivity, activation energy and fill factor of standard p-i-n devices), and optical (a combination of transmission and photothermal deflection spectroscopy) measurements, indicates that trimethylboron doped layers have semiconducting properties similar to those of diborane doped layers. When trimethylboron is used, the contamination is shown to be reduced by at least a factor 50. In contrast, trimethylgallium, despite its acceptable doping efficiency, produces a contamination intermediate between the diborane and the trimethylboron ones. The effects of C incorporation in the doped layers have also been studied, in particular by optical absorption measurements in the band-edge region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00331676
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  • 9
    Electronic Resource
    Electronic Resource
    State estimation of linear dynamical systems under bounded control (1992)
    Springer
    Journal of optimization theory and applications 72 (1992), S. 299-318 
    Details
    ISSN: 1573-2878
    Keywords: Reachable sets ; linear dynamical systems ; bounded controls ; n-dimensional systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract The problem of estimation of all possible states that a linear system under bounded control may take (namely, the reachable or attainable set) is addressed. A number of previously developed Lyapunov techniques for estimating the reachable set of ann-dimensional linear system are extended and compared. The techniques produce over-estimates in the form ofn-dimensional ellipsoids. Illustrative examples are solved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00940520
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  • 10
    Electronic Resource
    Electronic Resource
    Antihormonal agents. Part 2: HPLC of ZK 98734 and its metabolites and ZK 98299 (1987)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 10 (1987), S. 557-559 
    Details
    ISSN: 0935-6304
    Keywords: Liquid chromatography ; Analytical HPLC ; Anti-progestins ; ZK 98734 ; ZK 98299 ; 11-(4-Aminophenyl) steroids ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Procedures are described for the reverse phase HPLC analysis of the antihormonal steroid ZK 98734 and two of its metabolites. Conditions are developed for the HPLC of the pure drug substance and for following its pharmacokinetics and metabolism. Analysis conditions are also reported for the antiprogestin ZK 98299.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240101006
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