Three-dimensional imaging of atomic four-body processes

@article{Schulz2003ThreedimensionalIO,
  title={Three-dimensional imaging of atomic four-body processes},
  author={M. Schulz and Robert Moshammer and D. Fischer and Holger Kollmus and Don H. Madison and S. L. Jones and Joachim Ullrich},
  journal={Nature},
  year={2003},
  volume={422},
  pages={48-50}
}
To understand the physical processes that occur in nature we need to obtain a solid concept about the ‘fundamental’ forces acting between pairs of elementary particles. It is also necessary to describe the temporal and spatial evolution of many mutually interacting particles under the influence of these forces. This latter step, known as the few-body problem, remains an important unsolved problem in physics. Experiments involving atomic collisions represent a useful testing ground for studying… 
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