112 research outputs found
Radiative activity of magnetic white dwarf undergoing Lorentz-force-driven torsional vibrations
We study radiative activity of magnetic white dwarf undergoing torsional
vibrations about axis of its own dipole magnetic moment under the action of
Lorentz restoring force. It is shown that pulsating white dwarf can convert its
vibration energy into the energy of magneto-dipole emission, oscillating with
the frequency equal to the frequency of Alfv\'en torsional vibrations, provided
that internal magnetic field is decayed. The most conspicuous feature of the
vibration energy powered radiation in question is the lengthening of periods of
oscillating emission; the rate of period elongation is determined by the rate
magnetic field decay.Comment: Mod. Phys. Lett. A 26 (2011) 359-36
Orbital and spin scissors modes in superfluid nuclei
Nuclear scissors modes are considered in the frame of Wigner function moments
method generalized to take into account spin degrees of freedom and pair
correlations simultaneously. A new source of nuclear magnetism, connected with
counter-rotation of spins up and down around the symmetry axis (hidden angular
momenta), is discovered. Its inclusion into the theory allows one to improve
substantially the agreement with experimental data in the description of
energies and transition probabilities of scissors modes in rare earth nuclei.Comment: arXiv admin note: text overlap with arXiv:1301.251
A new type of nuclear collective motion - the spin scissors mode
The coupled dynamics of low lying modes and various giant resonances are
studied with the help of the Wigner Function Moments method on the basis of
Time Dependent Hartree-Fock equations in the harmonic oscillator model
including spin-orbit potential plus quadrupole-quadrupole and spin-spin
residual interactions. New low lying spin dependent modes are analyzed. Special
attention is paid to the spin scissors mode.Comment: 21 page
Electric state below nuclear scissors
The solution of time dependent Hartree-Fock-Bogoliubov equations by the
Wigner function moments method predicts four low-lying states. Three of
them are known as various scissors modes. Fourth state is disposed below all
scissors modes and has the electrical nature. It is found that it represents
one of three branches of state which can exist in spherical nuclei and
which is split %due to a deformation. in deformed nuclei. It is discovered,
that the antiferromagnetic properties of nuclei lead to the splitting of
states already at the zero deformation.Comment: 20 pages, 6 figures, 2 table
Hexakis(dimethylformamide)bis(hexaphenylcyclohexasiloxanehexaolato)hexacopper(II) Dimethylformamide Solvate
The sandwich-like title complex, hexakis(dimethylformamide)-1O,2O,3O,4O,5O,6O-bis[2,4,6,8,10,12-hexaphenylsiloxane-2,4,6,8,10,12-hexaolato(6-)-1:22O1,2:32O2,3:42O3,- 4:52O4,5:62O5,1:62O6]hexacopper(II) tetrakis(dimethylformamide) solvate, [Cu6(C3H7NO)6{(C6H5)6O12Si6}2].4C3H7NO, is comprised of two regular crown-shaped macrocyclic hexadentate organosiloxanolate ligands chelating a flat Cu6 hexagon, as in the ethanol-solvated analogue investigated previously. The title complex has a more distorted shape than the trigonal ethanol-solvated analogue, being slightly side-oblated, but still contains a large empty inner channel accessible by small molecules (the diameter of the free cross-section being about 2.5 Ă…). Each CuII ion has square-pyramidal coordination with four basal siloxanolate O atoms and an apical dimethylformamide (DMFA) molecule (coordinated through its carbonyl group). The average bond lengths are: Cu-O(Si) 1.964 (11) Ă… and Cu-O(DMFA) 2.215 (10) Ă…. The structure contains four additional DMFA molecules per complex unit, linked by weak C-HO hydrogen bonds. Unexpectedly, the C=O bond length is longer [1.248 (10) and 1.255 (9) Ă…] in the uncoordinated DMFA molecules than in the coordinated [1.214-1.227 (7) Ă…]
Surface response of spherical core-shell structured nanoparticle by optically induced elastic oscillations of soft shell against hard core
The optically induced oscillatory response of a spherical two-component,
shell-core structured, nanoparticle by nodeless elastic vibrations of soft
peripheral shell against hard and dynamically immobile inner core is
considered. The eigenfrequencies of the even-parity, spheroidal and odd-parity
torsional vibrational modes trapped in the finite-depth shell are obtained
which are of practical interest for modal specification of individual
resonances in spectra of resonant scattering of long wavelength electromagnetic
waves by ultrafine particles.Comment: Surface Review and Letters (World Scientific) Year: 2009 Vol: 16
Issue: 1 (February 2009) Page: 5 - 1
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