Tranferionization in fast collisions:
a direct access to the
Helium ground state wave function.
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.
We are currently setting up a new COLTRIMS system to investigate this process with high resolution by measuring the electrons.
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