Materials Literature
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We have developed an efficient numerical method for calculating the differential cross sections (DCSs) of an electron scattering by two nuclei fixed in the space based on the R -matrix propagation technique in the prolate spheroidal coordinates. The DCSs of H + 2 and HeH 2+ are demonstrated.
We study interference effects in Compton scattering of a photon from positronium. Interference effects, which are due to the binding of an electron and a positron, are important at lower energies up to several keV. In our study we use full nonrelativistic electron/positron-photon interaction.
International audience
The autoionization cross section of rubidium atoms excited by electrons in the energy range from the 4p 6 lowest autoionization threshold to 30 eV was investigated for the first time. The data were obtained by summarizing the normalized intensities of lines in ejected-electron spectra measured at 54.7° observation ang…
Alkali-halide molecular clusters were formed from the vaporized molecules in collisions with an intense beam of argon clusters. Photoionization of the alkali-halide clusters as the result of interaction with x-ray radiation has been utilized in a photoelectron spectroscopy study of cluster bonding mechanisms. The chan…
A newly designed experimental setup for the study of induced damage from different radiations is presented. A narrow electron beam collides with a gold surface, generating secondary electrons. In order to cover a wide range of energies, several detectors are placed surrounding the sample, providing also angular resolu…
A short overwiev of recent results on x-ray emission obtained by JSI high resolution spectrometer is given. The report is about photoexcitation of atomic and molecular targets and deals with topics such as isolation of multiple excitation channels, the resonant Raman effect in radiative Auger decay, the interference o…
We have calculated the electron impact elastic scattering differential cross section for electron-xenon scattering using a distorted wave method and compared it with available experimental and theoretical results.
Graphene, an allotrope of carbon is a two-dimensional sheet of covalently bonded carbon atoms that has been attracting great attention in the field of electronics. In a recent review graphene is defined as a flat monolayer of carbon atoms tightly packed into a 2-D honeycomb lattice. A survey has been made of the produ…
A new method is described that allows super-elastic (SE) electron scattering studies to be extended to a wider range of targets. The technique employs an in-vacuum resonant optical enhancement cavity to amplify the intensity of the radiation interacting with the target atom. Initial SE results for Ca in a cavity are p…
The relativistic convergent close-coupling (RCCC) method has been used to resolve the discrepancy between theory and experiment for the polarization of the Lyman-α 1 x-ray line emitted by hydrogen-like Ti 21+ , Ar 17+ and Fe 25+ ions excited by electron impact. We find that account of Breit relativistic corrections is…
Broadening of transmitted electron angular profiles through a single cylindrically-shaped glass capillary was studied. The broadening effects were almost two times smaller than under similar conditions for HCIs, and transmitted electrons were found to lose energy due to poor charge deposition at the capillary exit.
We use both quantum mechanical and semiclassical dielectric formulations to study how an external charged particle, moving in the vicinity or traversing a solid surface, couples with the bulk and surface excitations. We pay special attention to the differences and similarities between incoming and outgoing trajectorie…
This paper is intended to give a brief tutorial understanding of on-die power grid effects. Board, package and on-die power grids deliver power to a die having both global (full-die) as well as local (intra-die) transient effects. With a simple excitation model and a detailed die/package/board model, one can come to u…
We present a detailed study of the partial and total cross section for photon induced electron emission from H + 2 . Employing approximate continuum and bounded wavefunctions for one and two center function basis we can deduce the origin and position of the Cooper like minima in the partial cross section and the relat…
The pre-retardation effects on a newly developed high-sensitivity angle and energy dispersive multichannel electron momentum spectrometer with almost 2π azimuthal angle range has been tested. Experiment on argon 3p shows significant improvement of coincident energy resolution when decelerating analyzed electrons.
We report absolute differential cross sections (DCSs) and integral cross sections (ICSs) for elastic electron scattering with CCl 4 molecules in the energy range of 1.5-100eV. In addition, the experimental DCSs are compared with the results from theoretical calculations based on the Schwinger multichannel method with…
In an fs-IR/EUV pump-probe core-level photoemission experiment the Insulator to Metal Phase Transition has been identified as being electronically driven.
The electron energy-loss spectrum of rubidium at 40 eV and scattering angle 8? has been recorded. The noticeable features are analysed. Differential cross sections for the resonance excitation are determined.
This presentation is intended to illustrate various types of collisional processes relevant for free clusters probed by x-ray photoelectron spectroscopy using our own examples ranging from free-electron-metal clusters, through half-metal and semiconductor clusters to dielectrics, the latter from van-der-Waals to ionic…