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  • 1
    Electronic Resource
    Electronic Resource
    Caged H atom and H2 molecule in relation to Monte Carlo study of molecular dissociation at constant volume (1996)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 18 (1996), S. 1061-1067 
    Details
    ISSN: 0392-6737
    Keywords: Thermodynamic properties ; equations of state
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Analytic results for electronic kinetic energy are first presented for a hydrogen atom in a spherical cage for two radii near to the corresponding densities employed in the path-integral Monte Carlo study of isochoric molecular dissociation in dense hydrogen by Magroet al. (Magro W. R., Ceperley D. M., Pierleoni C. andBernu B.,Phys. Rev. Lett.,76 (1996) 1240). The relevance of the «cage» results to the behaviour of dense atomic hydrogen is pointed out. Attention is then shifted to the molecular regime, and the variation with density of electronic kinetic energy for a H2 molecule in a rigid spheroidal cage is compared and contrasted with the Monte Carlo findings. The rigid-cage model mimics this, as well as bond length contraction, under compression.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457672
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  • 2
    Electronic Resource
    Electronic Resource
    Decay of correlations and related sum rules in a layered classical plasma (1995)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 155-167 
    Details
    ISSN: 0392-6737
    Keywords: Statistical theories of liquid structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary The asymptotic behaviours of particle correlation functions and the related sum rules are discussed for a layered classical plasma withe 2/r interactions in the fluid state, in dependence on the number of layers. These properties derive from consistency conditions imposed by screening on the hierarchical equations, as already treated by A. Alastuey and P. A. Martin (J. Stat. Phys.,39, 405 (1985)) for various Coulomb fluids. The main results concern i) the type of clustering of correlations needed for the validity of multipolar sum rules at various orders, ii) the proof that the pair correlation function in a finite multilayer may carry an electric dipole moment and the calculation of its partioning among the layers, and iii) the dimensionality crossover in an infinitely extended or periodically repeated multiplayer with varying interlayer spacing and wave vector.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02451594
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Accurate results on Bose-Einstein condensation in axially symmetric harmonic traps (1996)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 18 (1996), S. 1357-1362 
    Details
    ISSN: 0392-6737
    Keywords: Boson systems ; General studies of phase transitions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Accurate analytic results are obtained for the condensate fraction and the internal energy of mesoscopic systems of non-interacting Bose particles confined in an axially symmetric harmonic trap. Earlier results for a spherical trap are recovered and numerical illustrations for an experimentally relevant case are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02453269
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Electron localization and the non-metal-metal transition in alkali-alkali-halide solutions (1996)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 18 (1996), S. 613-620 
    Details
    ISSN: 0392-6737
    Keywords: Metal-insulator transitions ; Molten salts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We evaluate and extend an earlier proposal for a microscopic theory of the non-metal-to-metal (NM-M) transition which occurs on dissolving an alkali metal in it molten halide. The transition is viewed as involving a balance between the free-energy gain from the binding of valence electrons into localization centres and the excess free energy of the ionic assembly screened by the electrons. Using parameters estimated for solutions of potassium in potassium chloride and assuming that the elementary process of electronic trapping is the formation ofF-centre-like clusters, Thomas-Fermi screening by metallic electrons is shown to lead to a very sharp NM-M transition at a concentration in the range of 25–30% added metal. Thermally activated hopping of the localized electrons and the evolution of the localization centres with composition are next crudely taken into account by allowing for an additional contribution to the inverse screening length, which is estimated from the electronic localization length. This is shown to lead to a progressive break-up of the localization clusters, accelerating into a NM-M transition in the same concentration range. This simplified theoretical scenario is consistent with the available experimental evidence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02453252
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Coordinate space form of interacting reference response function ofd-dimensional jellium (1995)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 1165-1179 
    Details
    ISSN: 0392-6737
    Keywords: Collective effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary The interacting reference response functionX I [3](k) of three-dimensional jellium ink space was defined by Niklasson in terms of the momentum distribution of the interacting electron assembly. Here the Fourier transformF I [d](r) ofX I [d] (k) is studied for the jellium model withe 2/r interactions in dimensionalityd=1,2 and 3, in an extension of recent work by Holas, March and Tosi for the cased=3. The small-r and large-r forms ofF I [d] (r) are explicitly evaluated from the analytic behaviour of the momentum distributionn d(p). In the appendix, a model ofn d (p) is constructed which interpolates between these limits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02454131
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    Paper (German National Licenses)
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