Fischer D, Moshammer R, Dorn A, Crespo López-Urrutia JR, Feuerstein B, Höhr C, Schröter CD, Hagmann S, Kollmus H, Mann R, Bapat B, Ullrich J. Projectile-charge sign dependence of four-particle dynamics in helium double ionization.
PHYSICAL REVIEW LETTERS 2003;
90:243201. [PMID:
12857190 DOI:
10.1103/physrevlett.90.243201]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2003] [Indexed: 05/24/2023]
Abstract
Double ionization of helium by 6 MeV proton impact has been explored in a kinematically complete experiment using a "reaction microscope." For the first time, fully differential cross sections for positively charged projectiles have been obtained and compared with data from 2 keV electron impact. The significant differences observed in the angular distribution of the ejected electrons are attributed to the charge sign of the projectile, resulting in different dynamics of the four-particle Coulomb system, which is not considered in the first Born approximation.
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