Phys. Rev. Lett. 100, 063201 (2008) [4 pages]Out-of-Plane (e, 2e) Experiments on Helium L=0, 1, 2 Autoionizing LevelsReceived 11 September 2007; published 11 February 2008 Out-of-plane (e, 2e) measurements are reported for the helium autoionizing levels (2s2)1S, (2p2)1D, (2s2p)1P, and for direct ionization. While the recoil peak almost vanishes in the angular distribution for direct ionization, it remains significant for the autoionizing levels and exhibits a characteristic shape for each orbital angular momentum L=0, 1, 2. A second-order model in the projectile-target interaction correctly reproduces the observed magnitudes of the recoil peaks, but is a factor of 2 too large in the central out-of-plane region. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.063201
DOI:
10.1103/PhysRevLett.100.063201
PACS:
34.80.Dp
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