Il Nuovo Cimento D (Nuovo Cimento Soc Ital Fisica )

Publisher: Società italiana di fisica, Springer Verlag


Discontinued in 1998.

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    Nuovo Cimento della Società Italiana di Fisica - D: Condensed Matter, Atomic, Molecular and Chemical Physics, Biophysics website
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    Nuovo Cimento della Società italiana di fisica, [Sezione] D, Nuovo cimento della Società italiana di fisica., Condensed matter, atomic, molecular and chemical physics, biophysics, Condensed matter, atomic, molecular, and chemical physics, fluids, plasmas, biophysics
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Springer Verlag

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Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: A volume-preserving symplectic map is proposed to describe the magnetic field lines when the Taylor equilibriumis perturbed in a generic way. The standard scenario is observed by varying the perturbation strength, but the statistical properties in the chaotic regions are not simple due to the presence of boundaries and remnants of invariant structures. Simpler models of volume-preserving maps are proposed. The slowly modulated standard map captures the basic topological and statistical features. The diffusion is analytically described for large perturbations (above the break-up of the last KAM torus) in terms of correlation functions and for small perturbations using the adiabatic theory, provided that the modulation is sufficiently slow.
    Il Nuovo Cimento D 12/1998; 20(12):1795-1818.
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    ABSTRACT: The diffraction of a spherical acoustic wave from the juncture of pressure release (soft) and locally reacting (absorbing) half-planes in a fluid moving at subsonic velocity is examined. This consideration is important because the point sources are regarded as better substitutes for real sources than line sources/plane waves. The integral representation of the field is obtained using integral transforms and the Wiener-Hopf technique. The factorization of the kernel function in the Wiener-Hopf functional equation is accomplished. The analytic solution of the integrals is obtained by employing asymptotic methods and the far field is presented. The effect of the Mach number is shown explicitly on the diffracted field.
    Il Nuovo Cimento D 12/1998; 20(12):1819-1833.
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    ABSTRACT: This work reports the electronic structure of GaInAsSb quaternary alloy by recursion method. A five-orbital sp3s* per atom model was used in the tight-binding representation of the Hamiltonian. The local density of states (LDOS), integrated density of states (IDOS) and structural energy (ST.E) were calculated for Ga, In, As and Sb sites in Ga0.5 In0.5 As0.5 Sb0.5 and GaInAsSb lattice matched to GaAs and the same alloy lattice matched to GaSb. There are 216 atoms in our cluster arranged in a zincblend structure. The results are in good agreement with available information about the alloy.
    Il Nuovo Cimento D 12/1998; 20(12).
  • Il Nuovo Cimento D 10/1998; 20:1659.
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    ABSTRACT: A theoretical investigation has been made of obliquely propagating dustacoustic solitary waves in a magnetized dusty plasma which consists of a negatively charged cold dust fluid, Boltzmann-distributed electrons, and nonthermally distributed ions. The reductive perturbation method has been employed to derive the Kortewegde Vries (K-dV) equation which admits a solitary wave solution for small but finite amplitude limit. The solitary wave may change from compressive to rarefactive depending on the value of α (a parameter determining the number of nonthermal ions present in this plasma model). It is seen that for no background free electron there exist compressive (rarefactive) solitary waves when α ≤ (>)0.155 and that, as the number of the background free electrons increases, we need a higher value of α in order for rarefactve solitary waves to exist. The effects of obliqueness and external magnetic field on the nature of these compressive and rarefactive solitary waves are also discussed.
    Il Nuovo Cimento D 09/1998; 20(9).
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    ABSTRACT: We show how to compute the depth-dependent susceptibility in the region of excitonic resonances. From its shape the depth of the exciton-free layer (“dead layer” ) can be established as a function of the excitonic energy. Numerical examples appropriate to GaAs/Ga1-xAlxAs superlattices are given. We show that the dead-layer depth increases when the energy of the incoming photon approaches the excitonic resonances. Near the resonances an excitonic enhancement of the susceptibility is also found in the “dead layer” itself. PACS 71.35Excitons and related phenomena. PACS 78.66Optical properties of specific thin films-surfaces-and low-dimensional structures: superlattices-quantum well structures-multilayers-and microparticles.
    Il Nuovo Cimento D 09/1998; 20(9):1355-1365.
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    ABSTRACT: A theoretical investigation has been made of the parametric excitation of electrostatic waves at the beat frequency of two high-power, collinear, uniform laser beams in a highly collisional, magneto-active, compensated semiconductor plasma. The gyro-kinetic approach has been employed to find the linear and nonlinear response of electrons and holes in this semiconductor plasma. It is found that for typical plasma parameters in compensated Ge, two collinear laser beams of equal power density, 2.37 MW cm-2, can excite beat waves of power density 1 kW cm-2. The effects of electron-phonon collision frequency (v), transversely applied external magnetic field (B0), plasma density (n0), and variation of the effective mass of electrons and holes on this parametric excitation process in a semiconductor plasma are discussed. PACS 52.35.MwNonlinear waves and nonlinear wave-propagation (including parametric effects, mode coupling, ponderomotive effects, etc.)
    Il Nuovo Cimento D 09/1998; 20(9):1327-1336.
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    ABSTRACT: Visible-light scattering on glass spheres in resin is considered as qualitatively representative of the actual situations of visible effects due to coatings or plastic sheets with non-absorbing pigments like mica pigments. Diffuse reflection and transmission are simulated by the Monte Carlo technique. The model consists of glass spheres in acrylic resin with section between 7.5 and 30 µm such that geometrical optics can be applied. Phenomena like shot and iridescent effects are described. PACS 42.66.QgScales for light and color detection
    Il Nuovo Cimento D 09/1998; 20(9):1295-1306.
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    ABSTRACT: Thin films of transparent conductingn-type cadmium oxide have been deposited on glass substrates by a modified reactive thermal evaporation technique. X-ray diffraction (XRD) and X-ray fluorescence analysis confirm that the films are cadmium oxide. XRD also reveals that the 250 °C annealed films are polycrystalline with a preferred orientation along the (111) diffraction plane. The lattice parameter was found to be 4.961 Å. The films show a high optical transmittance (70–92%) in the visible and near-infrared regions of the electromagnetic spectrum. A direct bandgap value of 2.45 ± 0.05 eV has been obtained for the CdO film. The room temperature resistivity, carrier concentration and mobility were determined as 1.45 × 10-3 Ω cm, 7.35 × 1019 cm-3 and 59.77 cm2/V s, respectively. PACS 81.15Methods of deposition of films and coatings-film growth and epitaxy PACS 81.15.EgVacuum deposition PACS 68.55.JkStructure and morphology-thickness PACS 73.50.DnLow-field transport and mobility-piezoresistance
    Il Nuovo Cimento D 09/1998; 20(9):1421-1430.
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    ABSTRACT: A classical model of the hydrogen atom in a static electric field is studied, basing upon the work [ Hooker A. et al, {\it Phys. Rev. A}, 55 (1997) 4609 ]. In that work the electrons are supposed to move along Kepler orbits around the nucleus, while interacting with the external field. That classical model reproduces very well the true energy shift of the linear Stark effect. The agreement with the second order effect is poor. It is shown here that the results for the quadratic Stark effect may be considerably improved if the electrons are still allowed to move along classical trajectories, but whose initial conditions are statistically sampled from a distribution resembling the quantum mechanical one.
    Il Nuovo Cimento D 08/1998;
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    ABSTRACT: LiF crystals colored with ionizing radiation have been used in recent times as active materials for pulsed laser emissions in the visible and near infrared region of the electro-magnetic spectrum. Among the various color centers which possess high emission efficiencies, the F3 + center displays a peculiar optical cycle whose properties depend on temperature and pumping intensity. However a few effects discovered recently seem to imply the existence of interactions among the centers, which is a topic of paramount importance for applied and basic research. Preliminary results on samples containing high concentration of color centers have shown new dynamical effects, which in part can be explained in the frame of nonlinear optical processes and in part require a different approach in describing the optical cycle and its parameters. PACS 78.66.NkInsulators PACS 78.55.FvSolid alkali halides PACS 42.50.MdOptical transient phenomena-quantum beats, photon echo, free-induction decay, dephasings and revivals, optical nutation, and self-induced transparency PACS 01.30.EeMonographs and collections
    Il Nuovo Cimento D 07/1998; 20(7):845-852.
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    ABSTRACT: We present an overview of basic adsorption and dynamical processes at semiconductor surfaces, studied by first-principle simulations. We have considered prototypical semiconductor surfaces such as GaAs(110), which is the cleavage plane of GaAs, and Si(100), which is the most common orientation for silicon from epitaxial growth. We present an adsorption path and the stable configurations of a Cl2 molecule on GaAs(110), as well as the equilibrium state for complete and partial monolayer adsorption of H on the same surface. We also show the dynamical evolution of Si2 dimers on the Si(100) face: they alternate their buckling in a correlated way producing different reconstructions. PAC S 68.35.BsSurface structure and topography PACS 68.45.KgDynamics-vibrations PACS 71.15.PdMolecular dynamics calculations (Car-Parrinello) and other numerical simulations PACS 82.65.MYChemisorption PACS 01.30.EeMonographs and collections
    Il Nuovo Cimento D 07/1998; 20(7):967-974.
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    ABSTRACT: We review the predictions of the replica approach both for the statics and for the off-equilibrium dynamics. We stress the importance of the Cugliandolo-Kurchan off-equilibrium fluctuation-dissipation relation in providing a bridge between the statics and the dynamics. We present numerical evidence for the correctness of these relations. This approach allows an experimental determination of the basic parameters of the replica theory. PACS 61.20.LcTime-dependent properties-relaxation PACS 02.70.NsMolecular dynamics and particle methods PACS 64.70.PfGlass transitions PACS 01.30.EeMonographs and collections
    Il Nuovo Cimento D 07/1998; 20(7):1221-1228.
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    ABSTRACT: It is often considered that the linewidth, for a core level, or the edgewidth, for a band, is governed by the lifetime of the hole left upon excitation of the photoemitted electron. In most cases, the line profiles are actually driven by hardly controlled surface parameters. In the present paper, the particular case of semiconductors is considered: the presence of fixed-point charges, both along the surface and in the bulk, is shown to significantly contribute to linewidths (and edgewidths) in the photoemission process. A numerical treatment is presented in the specific case of η-type silicon. The effect of surface dipoles on photoemission peak profiles is discussed.
    Il Nuovo Cimento D 07/1998; 20(7-8).
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    ABSTRACT: We have utilized three experimental methods to study clean and adsorbed Si surfaces exploiting electron scattering in different kinetic energy regimes (ranging from 100 to 1000 eV) for determining a number of structural parameters associated with surface local environment. This has been obtained by the analysis of the anisotropies of the intensities of core levels, Auger electron or back-diffusion of the elastic peak. Photoelectron and Auger electron diffraction are based on physical principles analogous to those of LEED although there are many significant differences to compare to, due to the similar structural information which can be deduced. Finally we report a different approach to electron holography which benefits from important issues. PACS 61.14Electron diffraction and scattering PACS 61.14.QpX-ray photoelectron diffraction PACS 61.14.NmElectron holography-PACS 01.30.Ee-Monographs and collections
    Il Nuovo Cimento D 07/1998; 20(7):991-998.
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    ABSTRACT: Summary A brief account of the capabilities of the SuperESCA beamline at ELETTRA is given, in connection with chemical kinetics experiments on model catalytic reactions. Fast X-ray photoemission spectroscopyin situ measurements of reactant’s coverages are presented for “titration” experiments on the oxidation of carbon monoxide on a Rh(110) surface. It is shown that these data, in connection with the evolution rate of CO2, may give an insight into the elementary steps of the reaction not previously possible with other surface science techniques.
    Il Nuovo Cimento D 07/1998; 20(7):1103-1109.