Tracing Multiple Scattering Patterns in Absolute (e, 2e) Cross Sections for H₂ and He over a 4π Solid Angle
Absolutely normalized (e,2e) measurements for H2 and He covering the full solid angle of one ejected electron are presented for 16 eV sum energy of both final state continuum electrons. For both targets rich cross-section structures in addition to the binary and recoil lobes are identified and studied as a function of the fixed electron's emission angle and the energy sharing among both electrons. For H2 their behavior is consistent with multiple scattering of the projectile as discussed before. For He the binary and recoil lobes are significantly larger than for H2 and partly cover the multiple scattering structures. To highlight these patterns we propose a alternative representation of the triply differential cross section. Nonperturbative calculations are in good agreement with the He results and show discrepancies for H2 in the recoil peak region. For H2 a perturbative approach reasonably reproduces the cross-section shape but deviates in absolute magnitude.
X. Ren and A. Senftleben and T. Pflüger and A. Dorn and J. Colgan and M. S. Pindzola and O. A. Al-Hagan and D. H. Madison and I. Bray and D. V. Fursa and J. H. Ullrich, "Tracing Multiple Scattering Patterns in Absolute (e, 2e) Cross Sections for H₂ and He over a 4π Solid Angle," Physical Review A - Atomic, Molecular, and Optical Physics, vol. 82, no. 3, American Physical Society (APS), Sep 2010.
The definitive version is available at https://doi.org/10.1103/PhysRevA.82.032712
Keywords and Phrases
Continuum electrons; Cross section; Differential cross section; Ejected electrons; Emission angle; Energy sharings; Final state; Non-perturbative calculations; Perturbative approach; Recoil peak; Scattering structures; Solid angle; Atomic physics; Multiple scattering; Electrons
International Standard Serial Number (ISSN)
Article - Journal
© 2010 American Physical Society (APS), All rights reserved.
01 Sep 2010