Differential electron-Cu5+elastic scattering cross sections extracted from electron emission in ion-atom collisions

Abstract

We present a method of deriving energy and angle-dependent electron-ion elastic scattering cross sections from doubly differential cross sections for electron emission in ion-atom collisions. By analyzing the laboratory frame binary encounter electron production cross sections in energetic ion-atom collisions, we derive projectile frame differential cross sections for electrons elastically scattered from highly charged projectile ions in the range between 60°and 180°. The elastic scattering cross sections are observed to deviate strongly from the Rutherford cross sections for electron scattering from bare nuclei. They exhibit strong Ramsauer-Townsend electron diffraction in the angular distribution of elastically scattered electrons, providing evidence for the strong role of screening played in the collision. Experimental data are compared with partial-wave calculations using the Hartree-Fock model.

Elastic resonant and nonresonant differential scattering of quasifree electrons fromB4+(1s)andBenis1, Zouros2, Gorczyca3 et al. 2004Phys. Rev. ASelf Cite3232011View full textAdd to dashboardCite

“…Good agreement with more recent R-matrix calculations have caught the attention of the electron-ion scattering community [1,10] and include measurements of resonant and nonresonant elastic [49,58] and inelastic [42,57] electron scattering from H-like ions, as well as superelastic scattering from metastable He-like ions [59,60]. Recent reviews of quasifree electron scattering can be found in Refs.…”

“…These processes have been exten-sively studied in the literature and numerous articles can be found both for BEe (see, for example, [40,[43][44][45][46][47][48][49]) and RTEA (see, for example, [23,38,[50][51][52][53][54][55][56]). The realization that both RTEA and BEe could be treated within the ESM on the same footing as quasifree elastic resonant (for RTEA) and nonresonant (for BEe) electron scattering from HCI led to the use of the powerful electron scattering R-matrix technique to describe both processes.…”

“…The realization that both RTEA and BEe could be treated within the ESM on the same footing as quasifree elastic resonant (for RTEA) and nonresonant (for BEe) electron scattering from HCI led to the use of the powerful electron scattering R-matrix technique to describe both processes. An evolution in nomenclature reflecting this deeper understanding [41,42,49,[57][58][59][60] has followed, and thus the term RES, which includes not only the resonant part but also interferences between the resonant and nonresonant part, is used here instead of the older RTEA, while the intermediate resonant state population mechanism will be referred to as RE. RTEA singly differential cross sections (SDCS) measured prior to 1996 have always been found to be smaller than the existing theory, while RTEX (RTE measurements of the emitted x-ray [22] rather than Auger electrons) SDCS have always been in good agreement with theory [23].…”

“…Quasifree electron-ion scattering investigations have been refined over the past decade [21,41,49,57,61,62], substantially reducing undesirable nucleus-ion contributions (e.g., e-n interactions) by choosing favorable collision conditions and low-Z targets [21,46]. Good agreement with more recent R-matrix calculations have caught the attention of the electron-ion scattering community [1,10] and include measurements of resonant and nonresonant elastic [49,58] and inelastic [42,57] electron scattering from H-like ions, as well as superelastic scattering from metastable He-like ions [59,60].…”

Electron-capture-to-continuum cusp inU88++N2collisions

“…Theoretical treatments of the binary encounter process (iii) have exhibited unexpected but very rich features of diffraction in quasielastic electron-ion scattering [6][7][8], However, the process (ii) is theoretically the most challenging, particularly for high atomic numbers of projectile and target, atomic numbers, Zp and Zf, and relativistic collision velocities. Its description requires one to deal with a two-center problem of an electron being transferred from an initially bound state of the target atom to a final low-energy continuum state of the projectile ion, and a fully relativistic theory for this process is not yet available.…”