The correlated Kinematical Transfer Ionization channel cKTI in fast
4-body (p + He -> H0 + He2+ + e) processes has been used to probe the
highly correlated contributions to the asymptotic part of the He ground
state wave function. In this reaction one electron with controlled
initial momentum (2.5 to 7.5 a.u.) in the He ground state is
kinematically captured by the proton at large impact parameters. The
measured 3-particle final-state momentum distributions show features of
a well-structured three-particle momentum wave function. We conclude
that cKTI must almost exclusively proceed via the highly correlated and,
virtually excited, non-s2 contributions in the He ground state.
Most of the electrons are emitted in the
H0 scattering plane and in the backward direction. The final state
momentum distributions show discrete structures very different from
those expected for uncorrelated capture and ionization:
(a,b) recoil ion and (c-f) electron momentum distributions
projected onto the H0 projectile scattering plane
for different H0 scattering angles. kz is the
direction of the incoming projectile momentum, kx
the direction of the scattered H0 transverse momentum, ky
the transverse momentum perpendicular to
the scattering plane.
We are currently setting up a new COLTRIMS system to investigate this
process with high resolution by measuring the electrons.
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