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  • 1
    Electronic Resource
    Electronic Resource
    An X-ray photoelectron spectroscopy study on zeolites
    Amsterdam : Elsevier
    Chemical Physics Letters 33 (1975), S. 95-98 
    Details
    ISSN: 0009-2614
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0009-2614(75)85461-3
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Sum rule for the optical absorption of an interacting many-polaron gas (2001)
    Springer
    The European physical journal 20 (2001), S. 27-33 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 74.25.Gz Optical properties – 74.25.Kc Phonons – 74.72.Jt Other cuprates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: A sum rule for the first frequency moment of the optical absorption of a many-polaron system is derived, taking into account many-body effects in the system of constituent charge carriers of the many-polaron system. In our expression for the sum rule, the electron-phonon coupling and the many-body effects in the electron (or hole) system formally decouple, so that the many-body effects can be treated to the desired level of approximation by the choice of the dynamical structure factor of the electron (hole) gas. We calculate correction factors to take into account both low and high experimental cutoff frequencies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00011092
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  • 3
    Electronic Resource
    Electronic Resource
    Dynamical exchange effects in a two-dimensional many-polaron gas (2004)
    Springer
    The European physical journal 37 (2004), S. 447-452 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We calculate the influence of dynamical exchange effects on the response properties and the static properties of a two-dimensional many-polaron gas. These effects are not manifested in the random-phase approximation which is widely used in the analysis of the many-polaron system. Here they are taken into account by using a dielectric function derived in the time-dependent Hartree-Fock formalism. At weak electron-phonon coupling, we find that dynamical exchange effects lead to substantial corrections to the random-phase approximation results for the ground state energy, the effective mass, and the optical conductivity of the polaron system. Furthermore, we show that the reduction of the spectral weight of the optical absorption spectrum at frequencies above the longitudinal optical phonon frequency, due to many-body effects, is overestimated by the random-phase approximation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2004-00080-6
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  • 4
    Electronic Resource
    Electronic Resource
    Electron distribution of small Ni particles and Ce ions in X and Y zeolites related to their catalytic properties (1989)
    Springer
    The European physical journal 12 (1989), S. 425-429 
    Details
    ISSN: 1434-6079
    Keywords: 79.60 ; 36.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Catalytic behaviour of nickel particles smaller than 1.3 nm, encaged in X and Y zeolites, in the presence of Ce3+, is related to their electronic properties. In general the rates of reaction are lower than those of a standard catalyst made of 2.5 nm nickel particles on SiO2; this is attributed to the strong localization of the Ni 3d states due to the size effect. However a high rate, more than twice the standard, is found for Ni in X zeolite, in relation with a Ni 3d 10 configuration. On the other hand the fragmentation of butane is deeper with Ni in Y support than in X support and this corresponds to a high density of Nid states at the Fermi level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426988
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  • 5
    Electronic Resource
    Electronic Resource
    Wigner lattice of ripplopolarons in a multielectron bubble in helium (2003)
    Springer
    The European physical journal 32 (2003), S. 329-338 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 73.20.Qt Electron solids – 73.20.-r Electron states at surfaces and interfaces – 64.70.Dv Solid-liquid transitions – 68.35.Ja Surface and interface dynamics and vibrations – 47.55.Dz Drops and bubbles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The properties of ripplonic polarons in a multielectron bubble in liquid helium are investigated on the basis of a path-integral variational method. We find that the two-dimensional electron gas can form deep dimples in the helium surface, or ripplopolarons, to solidify as a Wigner crystal. We derive the experimental conditions of temperature, pressure and number of electrons in the bubble for this phase to be realized. This predicted state is distinct from the usual Wigner lattice of electrons: it melts by dissociation of the ripplopolarons when the electrons shed their localizing dimple as the pressure on the multielectron bubble drops below a critical value.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2003-00106-7
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