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  • 1990-1994  (19)
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  • 1
    Electronic Resource
    Electronic Resource
    Cyclopenta[cd] pyrene and monomethyl isomers (1991)
    s.l. : American Chemical Society
    The @journal of organic chemistry 56 (1991), S. 6717-6720 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00023a046
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Models for peroxidase compound I: generation and spectroscopic characterization of new oxoferryl porphyrin .pi. cation radical species (1992)
    s.l. : American Chemical Society
    Inorganic chemistry 31 (1992), S. 4404-4409 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00047a031
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    .beta.-Halogenated-pyrrole porphyrins. Molecular structures of 2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetramesitylporphyrin, nickel(II) 2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetramesitylporphyrin, and nickel(II) 2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetrakis(pentafluorophenyl)porphyrin (1992)
    s.l. : American Chemical Society
    Inorganic chemistry 31 (1992), S. 2044-2049 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00037a012
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Elementary excitations in multiple quantum wire structures (1992)
    Springer
    The European physical journal 89 (1992), S. 213-230 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We calculate the plasmon dispersion of electrons in multiple quantum wire structures. Wave function overlapping effects between different wires are neglected. The Coulomb interaction potential is calculated for a model with circular wire area. Analytical results for the excitation spectrum of electron multiple quantum wire structures are obtained within an one-subband model. Landau damping of intrasubband plasmons is discussed. Results for an electron superlattice within a two-subband model are presented and the coupling of intersubband plasmons with intrasubband plasmons is calculated. We compare the theoretical results with recent Raman measurements of intrasubband plasmons in Al x Ga1−x As/GaAs wire superlattices. The plasmon dispersion for boson multiple quantum wire structures also is calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01320939
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  • 5
    Electronic Resource
    Electronic Resource
    Correlation effects in the one-dimensional Bose gas (1993)
    Springer
    The European physical journal 91 (1993), S. 397-401 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We discuss interaction effects for the one-dimensional Bose gas with a repulsive delta-function interaction potential. We use the random-phase approximation and a finite local-field correction. Analytical results are given for the local-field correction, the pair-correlation function and the ground-state energy. The groundstate energy is found to be in much better agreement with the exact result than the ground-state energy calculated within the Bogoliubov approximation, where local-field corrections are neglected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01344069
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  • 6
    Electronic Resource
    Electronic Resource
    Bogoliubov model with disorder: localization of bosons (1993)
    Springer
    The European physical journal 91 (1993), S. 501-505 
    Details
    ISSN: 1434-6036
    Keywords: 05.30.Jp ; 74.65.+n ; 74.70.Jm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract For temperature zero the effects of disorder for interacting bosons are considered. The disorder induced superfluid-insulator transition in thed-dimensional disordered Bogoliubov model is discussed. Results for a short-range and a long-range random potential are given. For short-range disorder we argue that ford〈4 arbitrarily small disorder localizes the Bose condensate for vanishing interaction potential. Ford〉4 a certain strength of the disorder potential is necessary in order to localize the condensate. For the three-dimensional Bogoliubov model our results are in agreement with a recent calculation. We compare our theoretical predictions with numerical experiments for a disordered boson Hubbard model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01316830
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  • 7
    Electronic Resource
    Electronic Resource
    Instability of layered quantum liquids: 4. Intraplane and interplane correlations (1994)
    Springer
    The European physical journal 95 (1994), S. 341-355 
    Details
    ISSN: 1434-6036
    Keywords: 05.30.Fk ; 73.20.Mf ; 74.70.Jm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We calculate the local-field correctionsG(q, q z) f electron superlattices with interlayer distanced in order to describe many-body effects. A generalized Hubbard expression for the local-field correction is derived. The sum-rule version of the self-consistent approach for the local-field correction is developed and used to discuss the effects of exchange and correlation. The RPA-parameterr s and the ratiod/a * determine the many-body effects.a * is the effective Bohr radius. The stability region for the Fermi liquid behavior of the layered electron gas is discussed: (i) ford≫a * the critical RPA-parameterr sc≫1 is determined by exchange andintraplane correlation effects, (ii) ford≈a * withr sc≈1 correlation effects are small and the instability point is mainly determined by exchange effects, (iii) ford≪a * withr sc〈1 exchange andinterplane correlation effects are both important for the instability point. Our results are important for high-T c superconductors, organic superconductors and semiconductor superlattices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01343963
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  • 8
    Electronic Resource
    Electronic Resource
    Oxoferryl porphyrin cation radicals in model systems: Evidence for variable metal-radical spin coupling (1990)
    Springer
    Hyperfine interactions 58 (1990), S. 2343-2348 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Magnetic properties of frozen solutions of highly oxidized iron porphyrin complexes were investigated by EPR and Mössbauer spectroscopy. The Mössbauer spectra, recorded at low temperatures in various magnetic fields, were analyzed on the basis of spin Hamiltonian simulations. Spin coupling between ferryl iron (FeIV) and porphyrin cation radical was taken into account explicitly. Hyperfine and spin-coupling parameters are given for several complexes, together with zero-field parameters. One of the complexes exhibits weak spin coupling, it is the first model system exhibiting properties comparable to those of the oxoferryl cation radical enzyme Horse Radish Peroxidase I.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02398341
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  • 9
    Electronic Resource
    Electronic Resource
    Instability of layered quantum liquids: 1. Local-field correction in superlattices (1992)
    Springer
    The European physical journal 86 (1992), S. 193-206 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract For a superlattice with periodd the Singwi et al. (Phys. Rev.176, 589 (1968)) approach for the local-field correction and the static structure factor is formulated. With two approximations we reduce the resulting three-dimensional integral-equation into a one-dimensional integral-equation. For the local-field correction we present analytical results for small wave numbers and large wave numbers. An expression of Hubbard-typ is derived for the local-field correction. Explicit results for boson superlattices and electron superlattice are given. A charge-density-wave instability in a layered Bose condensate withr s〉rsc∝d3/4 is discovered.r s is the small parameter of the random-phase-approximation. The charge-density-wave instability is due to a many-body anomaly (short-range correlations) in layered structures and is a general property of layered quantum liquids. We find the charge-density-wave instability in a layered electron gas forr s〉rsc∝d. Double-quantum-well structures are also considered. The effects of a finite well width is calculated. The general implications of the charge-density-wave instability for microscopically layered quantum liquids are pointed out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01313826
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  • 10
    Electronic Resource
    Electronic Resource
    Superconductor-insulator transition in disordered boson-superlattices (1990)
    Springer
    The European physical journal 81 (1990), S. 155-164 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We calculate the transport properties of a disordered Bose condensate. A superlattice made from two-dimensional planes of bosons in the condensate phase is considered. The disorder is due to charged impurities. We consider a homogeneous distribution of impurities and also impurities randomly distributed in planes. The dispersion relation of the collective excitations (plasmons) for the clean boson superlattice is calculated. The disorder induced phase transiton from a superfluid phase to an insulator phase is discussed and the static conductivity (σ c ) at the transition point is expressed in terms of the microscopic parameters of the model. For strongly coupled planes we find thatσ c is of ordere 2/h. The relation of our theoretical results to experiments with high-temperature superconductors is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01309344
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