Collective excitations of3He clusters

Serra, Ll.; Garcías, F.; Barranco, M.; Navarro, J.; Giai, Nguyen Van

doi:10.1007/bf01543991

Cited by 9 publications

(6 citation statements)

References 9 publications

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“…The larger symmetry energies together with lower κ in figure 2 correlate with the lower GDR energies in figure 4. The GDR in 16 O, however, remains troublesome as it was for all previous SHF parameterizations [10,12,37]. The resonance energy stays far below the experimental values.…”

Section: Giant Resonancesmentioning

confidence: 84%

“…The reason is that most empirical information on nuclear structure is associated with densities near bulk equilibrium density ρ 0 ≈ 0.16 fm −3 . Systematic information in a wide range of densities has not yet been acquired, unlike, for example, the case of modeling liquid 3 He [17,18]. Nonetheless, the traditional form proportional to ρ 2+α is an arbitrary guess, it is rather rigid where extrapolation to the low-density region (=weak binding) is concerned, and, in particular, the nonanalytical behavior for noninteger α turns out to be a great hindrance for particle-number projection [12,19].…”

Section: Introductionmentioning

confidence: 99%

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Exploration of a modified density dependence in the Skyrme functional

2010

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A variant of the basic Skyrme-Hartree-Fock (SHF) functional is considered dealing with a new form of density dependence. It employs only integer powers and thus will allow a more sound basis for projection schemes (particle number, angular momentum). We optimize the new functional with exactly the same adjustment strategy as used in an earlier study with a standard Skyrme functional. This allows direct comparisons of the performance of the new functional relative to the standard one. We discuss various observables: bulk properties of finite nuclei, nuclear matter, giant resonances, super-heavy elements, and energy systematics. The new functional performs at least as well as the standard one, but offers a wider range of applicability (e.g. for projection) and more flexibility in the regime of high densities

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Section: Giant Resonancesmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Exploration of a modified density dependence in the Skyrme functional

2010

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“…A full quantum treatment for both, all electrons and ions, is extremely demanding and has not yet been applied to clusters. However, a QM treatment of He atoms has been widely used for He clusters (Serra et al, 1991;Weisgerber and Reinhard, 1992) and for He material in contact with metal clusters (Ancilotto and Togio, 1995;Nakatsukasa et al, 2002).…”

Section: Theoretical Tools For Cluster Dynamicsmentioning

confidence: 99%

Laser-driven nonlinear cluster dynamics

et al. 2010

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Laser excitation of nanometer-sized atomic and molecular clusters offers various opportunities to explore and control ultrafast many-particle dynamics. Whereas weak laser fields allow the analysis of photoionization, excited-state relaxation, and structural modifications on these finite quantum systems, large-amplitude collective electron motion and Coulomb explosion can be induced with intense laser pulses. This review provides an overview of key phenomena arising from laser-cluster interactions with focus on nonlinear optical excitations and discusses the underlying processes according to the current understanding. A brief general survey covers basic cluster properties and excitation mechanisms relevant for laser-driven cluster dynamics. Then, after an excursion in theoretical and experimental methods, results for single- and multiphoton excitations are reviewed with emphasis on signatures from time- and angular resolved photoemission. A key issue of this review is the broad spectrum of phenomena arising from clusters exposed to strong fields, where the interaction with the laser pulse creates short-lived and dense nanoplasmas. The implications for technical developments include the controlled generation of ion, electron, and radiation pulses, as will be addressed along with corresponding examples. Finally, future prospects of laser-cluster research as well as experimental and theoretical challenges are discussed.Comment: text and figures revise

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“…14,15 More information is available from extensive theoretical studies of the structure and energetics of 3 He droplets. [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] The most recent calculations predict that whereas 4 He clusters from the dimer upwards are all stable, 3 He clusters with less than 29 atoms are all unstable. 26 This is attributed to the large zero-point energy of the 3 He atoms resulting from their smaller mass and because of their Fermion nature.…”

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical study of the radial density distributions of large3Hedroplets

Harms¹,

Toennies²,

Barranco

et al. 2001

Phys. Rev. B

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The integral cross sections of large 3 He droplets and the number of atoms in the corresponding droplets (N ϭ2ϫ10 3 -2ϫ10 4 atoms) have been measured in molecular-beam scattering experiments. The experimental results are in very good agreement with integral cross sections calculated from the radial density distributions predicted from density-functional theory calculations. The experimentally confirmed theoretical 10-90% surface thicknesses vary between 8.0 Å (N ϭ10 3 ) and 7.6 Å (N ϭ4ϫ10 4 ) and are about 30% larger than calculated for 4 He droplets of similar sizes.

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Collective excitations of3He clusters

Cited by 9 publications

References 9 publications

Exploration of a modified density dependence in the Skyrme functional

Exploration of a modified density dependence in the Skyrme functional

Laser-driven nonlinear cluster dynamics

Experimental and theoretical study of the radial density distributions of large3Hedroplets

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