In a previous article [Phys. Rev. Lett. 117, 213201 (2016)] we have determined the angular resolved and the total energy spectrum of a positron produced via nonlinear Breit-Wheeler pair production by a high-energy photon counterpropagating with respect to a tightly focused laser beam. Here, we first generalize the results in that article by including the possibility that the incoming photon is ...

Features of the electron density in MgB(2) reconstructed from room-temperature single-crystal X-ray diffraction intensities using a multipole model are considered. Topological analysis of the total electron density has been applied to characterize the atomic interactions in magnesium diboride. The shared-type B-B interaction in the B-atom layer reveals that both sigma and pi components of the b...

The effect of phenols containing different electron-withdrawing substituents on the potentiometric responses of several liquid PVC membranes containing the complex trioctylmethylammonium-nitrate, TOMA(+)NO(3)(-), is analyzed. The results make it possible to separate these phenols into two groups; those phenols containing electron-releasing groups, which produce almost Nernstian slopes, and thos...

DNA hairpins in which an electron donor and an electron acceptor are attached to the ends are excellent model systems for the study of charge transfer in weakly coupled pi-stacked systems. In this communication we report on a computational study of the effect of the base pair sequence in these DNA hairpins on the kinetics of charge transfer. We show that the rate of charge transfer strongly dep...

Theoretical C 1s near edge x-ray absorption fine structure (NEXAFS) spectra for the C(9)H(10) isomers trans-methylstyrene, alpha-methylstyrene, and allylbenzene in gas phase and adsorbed at Cu(111) surfaces have been obtained from density functional theory calculations where adsorbate geometries were determined by corresponding total energy optimizations. The three species show characteristic d...

M. Nofal, S. Hagmann, Th. Stöhlker ,D. Jakubassa-Amundsen, C. Kozhuharov, R. Moshammer, J. Ullrich, A. Gumberidze,U. Spillmann, R. Reuschl, S. Heß, S.Trotsenko, D. Banas, F. Bosch, D. Liesen,H. Rothard , R. Dörner, Max Planck Institut für Kernphysik, Heidelberg, GSI, Darmstadt, Inst. f. Kernphysik, Univ. Frankfurt, 4 Mathematisches Institut der LMU München , CIRIL-Ganil,Caen,France Swift heavy-...

introduction the use of cut-outs in electron applicators make changes on output, isodose, and percentage depth dose (pdd) curves. these changes and electron beam dose distribution in the form of three-dimensional (3d) can be measured by gel dosimeters. materials and methods dosimetry was performed with and without a square shield (6×6 cm2 field). the energies were 4, 9, and 16 mev and phantom w...

The attainable specimen resolution is determined by the instrumental resolution limit d(i) and by radiation damage. Solid objects such as metals are primarily damaged by atom displacement resulting from knock-on collisions of the incident electrons with the atomic nuclei. The instrumental resolution improves appreciably by means of aberration correction. To achieve atomic resolution at voltages...

Absolute grand total cross sections (TCSs) for electron–disilane (Si2H6) scattering have been measured over the energy range from 1 to 370 eV in a linear transmission experiment. The low-energy TCS is dominated by a broad resonant-like enhancement. In the region of the maximum the present grand TCS values appeared to be distinctly lower than previously reported integral elastic cross section da...