We studied three-dimensional angular distributions and longitudinal momentum spectra of electrons ejected in transfer plus ionization (TI), i.e., the ejection of one and the capture of a second target electron, for ion-helium collisions. We observe a pronounced structure strongly focused opposite to the projectile beam direction, which we associate with a new correlated TI mechanism proposed recently. This process contributes significantly to the total cross sections over a broad range of perturbations η, even at η as large as 0.5, where uncorrelated TI mechanisms were thought to be dominant.
M. Schulz and X. Wang and M. Gundmundsson and K. R. Schneider and A. H. Kelkar and A. B. Voitkiv and B. Najjari and M. S. Schoffler and L. P. Schmidt and R. Dorner and J. H. Ullrich and R. Moshammer and D. Fischer, "Strongly Enhanced Backward Emission of Electrons in Transfer and Ionization," Physical Review Letters, vol. 108, no. 4, pp. 043202-1-043202-5, American Physical Society (APS), Jan 2012.
The definitive version is available at https://doi.org/10.1103/PhysRevLett.108.043202
Keywords and Phrases
Emission Of Electron; Longitudinal Momentum; Projectile Beam; Target Electrons; Total Cross Section; Angular Distribution; Helium; Ionization
International Standard Serial Number (ISSN)
Article - Journal
© 2012 American Physical Society (APS), All rights reserved.