We present a detailed investigation of static dipole polarizability of lithium clusters containing up to 22 atoms. We first build a database of lithium clusters by optimizing several candidate structures for the ground state geometry for each size. The full polarizability tensor is determined for about 5-6 isomers of each cluster size using the finite-field method. All calculations are performe...

We generalize the sum rules for the nucleon electric plus magnetic polarizability Σ = α + β and for the nucleon spin-polarizability γ, to virtual photons with Q2 > 0. The dominant low energy cross sections are represented in our calculation by one-pionloop graphs of relativistic baryon chiral perturbation theory and the ∆(1232)-resonance excitation. For the proton we find good agreement of the ...

Motivated by recent discussions concerning the manner in which damping appears in the electric polarizability, we show that a there is a dependence of the nonresonant contribution on the damping and that b the damping enters according to the ‘‘opposite sign prescription.’’ We also discuss the related question of how the damping rates in the polarizability are related to energy-level decay rates.

This paper considers the low-frequency scattering by a circular dielectric cylinder and modifies the exact polarizability tensor to extend the valid region of the known low-frequency solution. When compared to the traditional formulation, the proposed solution is shown to be valid for cylinders with a higher dielectric constant and larger radius. key words: low frequency scattering, polarizabil...

A practical method to evaluate the contributions of the nonlinear polarizability and anharmonicity of potentials from the experimental and simulation data by using double Fourier transformation is presented. In a Lennard-Jones potential system, an approximated expression of the fifth-order response function using the ratio between nonlinear polarizability and anharmonicity exhibits a good agree...

The background field method for measuring the electric polarizability of the neutron is adapted to the dynamical quark case, resulting in the calculation of (certain space-time integrals over) threeand four-point functions. Particular care is taken to disentangle polarizability effects from the effects of subjecting the neutron to a constant background gauge field; such a field is not a pure ga...

We study the dynamic electronic polarizability of a single nano-scale spherical metallic grain using a quantum mechanical approach. We introduce the model for interacting electrons bound in the grain allowing us numerically to calculate the frequency dependence of the polarizability of grains of different sizes. We show that within this model the main resonance peak corresponding to the surface...

Searches for CP-violating effects in atoms and molecules provide important constrains on competing extensions to the standard model of elementary particles. In particular, CP violation in an atom leads to the CP-odd T,P-odd polarizability CP: a magnetic moment CP is induced by an electric field E0 applied to an atom, CP= E0. We estimate the CP-violating polarizability for rare-gas diamagnetic a...