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  • 1
    Electronic Resource
    Electronic Resource
    Simultaneous angle-resolved measurement of the band structure of single-crystal graphite by an improved two-dimensional display analyzer (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 2857-2862 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have embodied a new version of two-dimensional display-type spherical mirror analyzer [H. Daimon and S. Ino, Rev. Sci. Instrum. 61, 57(1990)]. A couple of concentric hemispherical small grids and 12 pairs of obstacle rings have been attached to the original type of analyzer in order to operate with a constant pass-energy mode and improve the uniformity of the energy resolution of the analyzer all over the detection area, respectively. We performed a test on the resolution of the analyzer, and applied it to the simultaneous angle-resolved photoelectron spectroscopy on the band structures of single-crystal graphite (Kish graphite) within the acceptance cone of ±50°. The observed band structure is in good agreement with those reported by other investigators. We observed a ring-like pattern which enlarged as the binding energy approached the Fermi level. This ring is ascribed to the cross section of the π band. Although the designed energy resolution is 1% of the pass energy, the minimum value realized reached in this study was 0.2 eV for the pass energy of 10 eV [H. Daimon, Rev. Sci. Instrum. 59, 545 (1988); 61, 205 (1990)].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144373
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  • 2
    Electronic Resource
    Electronic Resource
    Circularly polarized light-induced dichroism in photoelectron diffraction observed with display-type spherical mirror analyzer : Proceedings of the 5th international conference on synchrotron radiation instrumentation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 1510-1512 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Strong circular dichroism in two-dimensional photoelectron diffraction patterns was observed for the photoelectron from the Si 2p core on the Si(001) surface using a display-type spherical mirror analyzer, although this Si(001) surface has no chirality and magnetism. The forward focusing peaks in the pattern rotate clockwise or counterclockwise when the helicity of the incident circularly polarized light is reversed. This phenomenon offers a new possibility to measure the polarization of the circularly polarized light in situ because the asymmetry is large (about 25%) and clear. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145893
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  • 3
    Electronic Resource
    Electronic Resource
    Improvement of the spherical mirror analyzer (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 57-60 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: With the use of some obstacle rings and a set of retarding grids, the resolution of the prototype spherical mirror analyzer, which has been developed in a previous paper [H. Daimon, Rev. Sci. Instrum. 59, 545 (1988)], was improved. The uniformity of the resolution with respect to the emission angle was also achieved. Some examples of electron energy-loss spectra and XPS spectrum were presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141923
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  • 4
    Electronic Resource
    Electronic Resource
    New display-type analyzer for the energy and the angular distribution of charged particles (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 545-549 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new principle for analyzing the kinetic energy as well as the angular distribution of charged particles has been discovered. A new display type analyzer was constructed according to theory. It consists of an inner hemispherical grid and an outer hemispherical electrode which has a radius two times larger than that of the inner grid. Charged particles with the same kinetic energy radiate from one point to all directions inside the inner grid, are repelled by the electric field between the two spheres, and converge at the point which is symmetric to the center of the hemispheres. When an aperture is put at the point, the angular distribution of the charged particles can be observed using a two-dimensional detector which is positioned out of the aperture. The characteristics of the analyzer are (1) the acceptance cone is ultimately wide, for instance, 2π sr for the charged particles emitted from a flat surface, (2) the pattern obtained is not distorted, and (3) the two electrodes are very simple and easy to construct.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139884
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  • 5
    Electronic Resource
    Electronic Resource
    Wholly aromatic polyamides containing bridged biphenylylene groups, 1. Poly(3,8-phenanthridinonediyl terephthalamide) (1982)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 183 (1982), S. 417-432 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: As a part of studies on wholly aromatic polyamides containing bridged biphenylylene groups, poly(3,8-phenanthridinonediyl terephthalamide) (DAP-T) was prepared from 3,8-diaminophenanthridinone and terephthaloyl chloride. The solutions of DAP-T samples in high concentration sulfuric acid exhibited optically different phases, depending on temperature and concentration, like those of poly(1,4-phenylene terephthalamide) (PPD-T). The phase diagram of the DAP-T-99,0% H2SO4 system was established and compared with that of the PPD-T-99,0% H2SO4 system. Both were essentially similar. The flow of high concentration dopes of DAP-T and PPD-T through spinneret holes showed non-Newtonian characteristics. The liquid-crystalline solutions of DAP-T in 99,0% sulfuric acid were spun into fibers using water as a coagulant. The tensile strength and initial modulus increased with increasing degree of stretching between spinneret and collection roller. The annealing of fibers caused an increase in tenacity and modulus, and a tensile strength of 25 g/den and an initial modulus of 1 000 g/den could be reached. Both spun fibers and annealed fibers showed x-ray diffraction patterns displaying distinct layer line streaks, from which the fiber period was estimated to be 17,2 Å. This agreed with the repeat distance in the direction of molecular axis calculated on the basis of extended chains with trans-conformation.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1982.021830213
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  • 6
    Electronic Resource
    Electronic Resource
    Wholly aromatic polyamides containing bridged biphenylylene groups, 2Part 1: cf.1. Copolyamides (1982)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 183 (1982), S. 433-457 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A number of wholly aromatic copolyamides containing bridged biphenylylene groups were synthesized from a mixture of aromatic diamines and terephthaloyl chloride, on one hand, and from a mixture of aromatic diacid dichlorides and 1,4-phenylenediamine, on the other hand. Each mixture of diamines and of diacid dichlorides was constituted of a phenylene derivative and a bridged biphenylylene derivative. The copolyamides synthesized were dissolved in high concentration sulfuric acid and spun into fibers. The fibers spun showed fairly high tensile strengths and high initial moduli, but annealing caused further increase in strength and modulus. All the copolyamides studied had very high thermal resistances.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1982.021830214
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  • 7
    Electronic Resource
    Electronic Resource
    Solvent effects on radical polymerization of cyclododecyl acrylate, 2Part 1. cf. 10.. Copolymerization (1975)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 176 (1975), S. 2375-2391 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die radikalische Copolymerisation von Cyclododecylacrylat (CDA) mit Styrol (St) und mit Acrylnitril (AN) wurde bei 60°C untersucht und zwar sowohl für die Mischung der reinen Monomeren als auch für ihre Lösungen in Benzol, Tetrahydrofuran und Dioxan. Analoge Copolymerisationsversuche wurden zum Vergleich mit Cyclohexylacrylat (CHA) ausgeführt.Bei der Copolymerisation mit Styrol verhalten sich beide Acrylate sehr ähnlich dem Methylmethacrylat. Dabei wird die Reaktivität beider Acrylate durch die Effekte der verschiedenen Estergruppen und der Lösungsmittel in gleicher Weise beeinflußt wie bei ihrer Homopolymerisation.Dagegen wurden bei der Copolymerisation von CDA mit AN gegenüber dem CHA Besonderheiten gefunden. In benzolischer Lösung sind beide Copolymerisationsparameter r1 und r2 größer als 1 (M1 = AN, M2 = CDA; r1 = 1,7, r2 = 2,0) und durch charakteristische Assoziationserscheinungen beider Monomerer in Lösung gedeutet.
    Notes: The radical copolymerization of cyclododecyl acrylate (CDA) with styrene (St) or acrylonitrile (AN) was studied in bulk, benzene, tetrahydrofuran, or dioxane at 60°C, and was compared with that of cyclohexyl acrylate (CHA).In the copolymerization with St, the change in the ester groups or the used solvents influenced the reactivity of both acrylates in the same manner as their homopolymerization rates. Approximately, CDA and CHA behaved like methyl methacrylate in the copolymerization with St.Contrary, in the cases of copolymerization of CDA with AN, peculiar results were obtained and interpreted in terms of characteristic association states of the monomers in the solutions. In benzene solution both the monomer reactivity ratios, r1 and r2, are larger than unity (M1 = AN, M2 = CDA; r1 = 1,7, r2 = 2,0).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1975.021760815
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  • 8
    Electronic Resource
    Electronic Resource
    Solvent effects on radical polymerization of cyclododecyl acrylate, 1. Homopolymerization (1975)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 176 (1975), S. 2359-2373 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die radikalische Homopolymerisation von Cyclododecylacrylat in Benzol, Tetrahydrofuran und Dioxan als Lösungsmittel wurde bei 60°C untersucht und mit der Polymerisation des Cyclohexylacrylates verglichen. Die beobachteten Differenzen der Polymerisationsgeschwindigkeiten beider Acrylate sind nicht mit den polaren und sterischen Substituentenkonstanten der Estergruppen in der Taft-Gleichung zu erklären. Darüber hinaus wurden auch bemerkenswerte Lösungsmitteleffekte bezüglich der Polymerisationsgeschwindigkeit gefunden und dem unterschiedlichen polaren Charakter der Lösungsmittel zugeschrieben.
    Notes: The radical homopolymerization of cyclododecyl acrylate at 60°C in benzene, tetrahydrofuran, or dioxane was studied and compared with that of cyclohexyl acrylate. The difference in the polymerization rates of the acrylates could not be interpreted in terms of the polar and steric substituent constants of ester groups in Taft's equation. Remarkable solvent effects on the polymerization rates for both acrylates were also found in the same manner and ascribed to the polar nature of the used solvents.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1975.021760814
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  • 9
    Electronic Resource
    Electronic Resource
    Polyesters containing ring units in main chains. I. Preparation and stereochemistry of monomers and polyesters (1980)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 18 (1980), S. 1665-1678 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Cycloalkanone (C5-C8, C12, and C15) or cycloalkane (C5 and C6) ring-containing monomeric diesters and the polyesters derived from them were prepared, and their configurations were studied by 13C-NMR spectroscopy. Absolute configurations were determined for ring sizes 5, 6, and 7. Configurational change during reduction of a ketonic group of monomeric diesters with ring sizes 5 and 6 was discussed in terms of the steric effect of ring substituents on the ketonic group. In the polycondensation reaction epimerization of the ring units was observed in 5-, 6-, and 7-membered cycloalkanones and not in others, which is explained by steric hindrance by the ring substituents against attack of tetrabutyl titanate catalyst on the ketonic group.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1980.170180602
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  • 10
    Electronic Resource
    Electronic Resource
    Über polystyrolderivate mit elementen der fünften hauptgruppeZugleich V. Mitt. über Umsetzungen an Poly-p-lithiumstyrol; IV. Mitt. s.2. (1963)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 62 (1963), S. 183-195 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Poly-p-vinyltriphenyl derivatives of the elements phosphorous, arsenic, antimony and bismuth can be prepared by treating poly-p-lithiumstyrene with the diphenylmonochloro compounds of these elements. The analogous N derivative is obtainable from poly-p-iodostyrene and diphenylamine.Monomer p-vinyltriphenyl compounds of phosphorous, arsenic, antimony and bismuth can be prepared from p-styrylmagnesium chloride and the mentioned diphenylmonochloro compounds. These styrene derivatives are polymerized radically; under comparable conditions the overall rate of polymerization is ten times larger than that of styrene. The investigation of the radical copolymerization with styrene shows that the reactivity ratios of the prepared monomers are nearly the same. Therefore the different elements of the fifth group have no different influence on the monomer reactivity of the prepared styrene derivatives.
    Notes: Durch Reaktion von Poly-p-lithiumstyrol mit den Diphenylmonochlorverbindungen von Phosphor, Arsen, Antimon und Wismut lassen sich Poly-p-vinyltriphenylderivate dieser Elemente erhalten. Aus Poly-p-jodstyrol und Diphenylamin ist die analoge Stickstoffverbindung zugänglich.Durch Umsetzung von p-Vinylphenylmagnesiumchlorid mit den genannten Diphenylmonochlorverbindungen können die monomeren p-Vinyltriphenylverbindungen von Phosphor, Arsen, Antimon und Wismut dargestellt werden. Diese Styrolderivate sind radikalisch polymerisierbar; ihre Polymerisationsgeschwindigkeit ist unter vergleichbaren Bedingungen etwa zehnmal größer als die von Styrol. Die Untersuchung der radikalischen Copolymerisation mit Styrol zeigt, daß die Copolymerisationsparameter der dargestellten Monomeren nahezu gleich sind; die verschiedenen Elemente der fünften Gruppe haben also fast keinen Einfluß auf die Polymerisationsreaktivität dieser Reihe von Styrolderivaten.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1963.020620119
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