Linac-based X-ray-free-electron lasers (XFELs) require very short bunches of highbrightness electron beams with peak currents of the order of kilo-Amperes. These bunches cannot be produced directly in guns because space charge forces would destroy the brilliance within a short distance [1]. Increasing bunch peak currents with longitudinal compression at beam energies high enough to suppress spa...

The internal s-electron polarization in the ground state of a Friedel-Anderson and a Kondo impurity is calculated. The Wilson basis with exponentially fine energies close to the Fermi level is used and expressed in terms of free electron waves with linear energy-momentum dispersion. It is found that in the singlet state the magnetic moment of the d-electron is screened by an s-electron cloud. T...

We present a theoretical investigation of electron-hole and exciton energy spectra as well as oscillator strengths of optical transitions in colloidal CdS quantum dots ~QD’s! with spherical and tetrahedral shape. The Coulomb potential energy of the electron-hole system is treated taking into account the dielectric mismatch at the QD boundaries. Calculation of electron-hole energy spectrum and C...

We investigated the electron–phonon coupling (EPC), in the vicinity of the Fermi level, for the surface-weighted states of Mo(112) from high resolution angle-resolved photoemission data taken parallel to the surface corrugation (i.e. 〈1̄1̄1〉). The surface-weighted bandwidth may be discussed in terms of electron–electron interactions, electron impurity scattering and electron–phonon coupling and e...

the use of appropriate level of theories for studying weak van der waal interactions such as 8-8stacking interactions of aromatic molecules has been an important aspect, since the high levelmethods have limitations for application to large molecules. the differences in the stacking energiesof various aromatic molecular structures are found significant. it is also very important for identifyingt...

' 'N the accompanying letter by Germer and Haworth, ~ evidence is presented to show that a positive ion in a high field (~107 volts/cm) must be able to eject several electrons from a metal. On the other hand, present theories of ejection by positive ions in low fields require that the ion be neutralized as the first step in the ejection process and, hence, that an ion be unable to eject more th...

the present study is to study linear free energy relationships (lfers) for dechlorination ratesin cement/fe(ii) slurries of eight chlorinated hydrocarbons including carbon tetrachloride, chloroform produced from carbon tetrachloride, 1,1,1-trichloroethane, trichloroethylene produced from 1,1,2,2-tetrachloroethane, tetrachloroethylene, trichloroethylene, 1,1-dichloroethylene, and vinyl chloride,...

Articles you may be interested in Plasma broadening and shifting of analogous spectral lines along isoelectronic sequences AIP Conf. Abstract: Level populations and line intensities are calculated for a pure Ne-like argon plasma showing their dependence on plasma parameters (electron temperature, density, plasma colmnn diameter, electron energy distribution, etc.). It is shown that intensity ra...

Nanoparticle dopants that are invisible to conduction electrons and have sharp dips in their electron scattering rate versus electron energy close to the Fermi level. Replacement of such dopants with traditional impurities results in simultaneous enhancement of the Seebeck coefficient and the electron mobility and therefore a large enhancement in the thermoelectric power factor can be achieved.