Original quasineutrality of a plasma at rest is heavily perturbed when the electrons are induced to oscillate relativistically by a superintense laser beam. This represents one of the major difficulties when studying the propagation of intense linearly polarized electromagnetic waves in plasmas. Particular attention has to be dedicated to the effective relativistic increase of the critical dens...

Inelastic x-ray scattering at large momentum transfer is an ideal probe of the ground state of electrons in condensed matter. The experimental determination of the electron momentum density (EMD) is based on the Impulse Approximation (IA). In general, the EMD even in simple metals cannot be well represented by the mean-field Independent Particle Model (IPM). In other words, the many-electron wa...

We have developed an all-electron density-functional ~AE-DF! program using the Mexican hat wavelet. The AE-DF program is applied to the ab initio all-electron calculations of small molecules as prototype systems, and the construction scheme of multiresolution support spheres is used to optimize the computational efficiency. Convergences are systematically demonstrated as a function of the numbe...

Accurate electron densities and X-ray form factors of Li, Be, F and their ions have been calculated. Electron correlation, crystal fields and ionic charge transfer change the form factors by up to a few percent, mainly in the range of sin 0 /k < | Ä " 1 . Although electron correlation and crystal fields are small perturbations, their effects on the density and form factor are not additive. Dens...

We discuss an exactly solvable model Hamiltonian for describing the interacting electron gas in a quantum dot. Results for a spherical square-well confining potential are presented. The ground state is found to exhibit striking oscillations in spin polarization with dot radius at a fixed electron density. These oscillations are shown to induce characteristic signatures in the momentum density o...

Introduction: Total Skin Electron Therapy (TSET) and Total Body Irradiation (TBI) are kinds of treatment which use electron and photon beams to treat special types of cancers. The aim of these techniques are to deliver uniform dose to the entire skin while minimizing delivered dose to organs at risk. To check the homogeneity of dose delivery in TBI and TSET, using a humanoid ph...

In this paper, we investigated the corrected plasmon dispersion relation for graphene in presence of a constant magnetic field which it includes a quantum term arising from the collective electron density wave interference effects. By using quantum hydrodynamic plasma model which incorporates the important quantum statistical pressure and electron diffraction force, the longitudinal plasmons ar...

Spectroscop ic studies of laser -induced p lasm a from a high -temperature superconducting mater ial, v iz., YBa2Cu 3O7 (YBCO), have been carried out. Electron temperature and electron density measurements were made from spectral data. The Stark broadening of emission lin es was used to determ ine the electron density, an d the ratio of line in tensities was exploited for the determ ination of ...