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  • 1995-1999  (17)
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  • 1
    ISSN: 1432-0630
    Keywords: PACS: 73.50.-h; 07.79.-v
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 351 (1995), S. 391-396 
    ISSN: 1434-601X
    Keywords: 21.60.Jz ; 21.60.Ev ; 03.65.Sq
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Two microscope theories for multiple resonances in nuclei are compared, n-particle-hole RPA and quantized Time-Dependent Hartree-Fock (TDHF). The Lipkin-Meshkov-Glick model is used as test case. We find that quantized TDHF is superior in many respects, except for very small systems.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1434-601X
    Keywords: PACS:21.30.Fe Forces in hadronic systems and effective interactions – 21.60.Jz Hartree-Fock and random-phase approximations – 24.10.Jv Relativistic models – 27.90.+b 220 ≤ A
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The ground–state properties of superheavy nuclei are investigated within various parametrisations of relativistic and nonrelativistic nuclear mean–field models. The heaviest known even–even nuclei starting with Z = 98 are used as a benchmark to estimate the predictive power of the models and forces. From that starting point, deformed doubly magic nuclei are searched in the region 100 ≤ Z ≤ 130 and 142 ≤ N ≤ 190.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 6 (1999), S. 157-165 
    ISSN: 1434-601X
    Keywords: PACS: 21.60.Jz Hartree-Fock and random-phase approximations – 21.60.-n Nuclear-structure models and methods
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Neutron–rich nuclei with a closed neutron shell represent chains of waiting–point nuclei in the astrophysical r–process. Details of their nuclear structure like separation energies, shell structure and β−–decay half–lives have a dramatic influence on element abundances calculated from r–process simulations. Actual supernova scenarios take place at finite temperature. To investigate the influence of finite temperature on binding energies and shell gaps, i.e. the second derivative of the binding energy, we calculate the shell gaps in the range of interest and slightly beyond, i.e. 0 ≤k B T≤ 0.8 MeV. Basis of the description is the self–consistent Skyrme–Hartree–Fock model and an extension of BCS pairing to finite temperature using a natural orbital representation.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1434-6079
    Keywords: PACS. 36.20.Kd Electronic structure and spectra - 36.40.Gk Plasma and collective effects in clusters - 36.40.Vz Optical properties of clusters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We investigate spin modes in the ground state and the polarized first isomer of the Na12 cluster describing the valence electrons in time-dependent local-spin-density approximation (TDLSDA) and the detailed ionic background using local pseudopotentials. The spin modes show a collective redshift compared to the unperturbed particle-hole excitations. They are strongly fragmented and the average energy of the modes along the principal axes are related to the underlying geometry (triaxial or axially symmetric). For the polarized isomer, we find significant cross talk between the spin modes and the dipole plasmon, which hints at a possible spectroscopic identification.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Ordered structures in beams survive the bending in dipole magnets of a storage ring, provided that the ring is smooth: the dispersion must be nearly constant around the ring, so that the transversal velocity profile of the particles in the beam remains undisturbed. Conventional laser cooling affects the ions in the beam independently of their transversal position, so that the velocity profile is disturbed and the order is destroyed. We show with the help of molecular dynamics computer simulations that order can be preserved if the cooling force depends on the transversal position of the particles in such a manner that the dispersion and the transversal velocity profile remain constant (graded cooling).
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 3 (1998), S. 175-178 
    ISSN: 1434-6079
    Keywords: PACS. 36.40.Cg Electronic and magnetic properties of clusters - 36.40.Gk Plasma and collective effects in clusters - 36.40.Wa Charged clusters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We study the amplification of an incoming fs laser pulse through the resonant plasmon response in a metal cluster taking Na clusters as test case and using density-functional theory for the description of the electronic dynamics. We find large amplification factors for moderate laser intensities. The effect shrinks for higher intensities because the binding forces of the electron cloud set a limit for the effective fields. The response shows resonant behaviour much similar to an harmonic oscillator. It is found to be independent of cluster size.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1434-6079
    Keywords: PACS. 36.40.Cg Electronic and magnetic properties of clusters - 36.40.Wa Charged clusters - 42.50.Hz Strong-field excitation of optical transitions in quantum systems; multi-photon processes; dynamic Stark shift
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We study the excitation of metal clusters irradiated by intense laser beams, within the framework of a time dependent density functional approach at fully quantal or semiclassical levels. We focus on ionization processes and energy deposition. It is shown that intense lasers are as efficient as energetic ions to create highly charged clusters, and with comparable deposited excitation energy. We also discuss coupling of electronic to ionic degrees of freedom. We finally consider the importance of accounting for dynamical two-body correlations in the semiclassical approximation and discuss second harmonic generation.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1434-6079
    Keywords: PACS: 36.40.-c Atomic and molecular clusters – 36.40.Gk Plasma and collective effects in clusters – 71.24.+q Electronic structure of clusters and nanoparticles – 72.20.Ht High field and nonlinear effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Laser excitation of metal clusters depends on various parameters such as frequency, intensity, and pulse time. We give here an overview of relevant time scales and forces for the example of Na clusters. Variation of laser intensity is studied in connection with second harmonic generation. We see a rather sudden transition from a perturbative regime at low intensities to a field-dominated regime for larger intensities. We use the non-linearized time-dependent local density approximation (TDLDA), together with a local pseudopotential for the interaction of the valence electrons with the ions. Explicit ionic motion is taken into account in one test case where we demonstrate the importance of ionic effects for the detailed time evolution at times larger than 100 fs.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1434-6079
    Keywords: PACS: 36.40.-c Atomic and molecular clusters – 31.15.-p Calculations and mathematical techniques in atomic and molecular physics – 71.15.-m Methods of electronic structure calculations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We present the ionic geometries of Na9 + and Na55 + clusters obtained in the “cylindrically averaged pseudopotential scheme”. Our structures are tested by calculating photoabsorption spectra and comparing them to the experimentally measured ones. We employ a local pseudopotential that has been constructed to reproduce atomic and bulk properties of sodium. Comparing the results using different pseudopotentials, we find that the position of the dipole resonance is greatly influenced by details of the pseudopotentials, showing that these must be used consistently both in the geometry optimization and the calculation of the optic response.
    Type of Medium: Electronic Resource
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