Abstract
In Coulomb three-body problems, configurations of close proximity of the particles are classically unstable. In confined systems they might however exist as excited quantum states. By studying a maximally symmetric subspace of the three-body problem one obtains strong evidence for the existence of excited states for which the wavefunction is nonzero for triple collision configurations. Quantum control of such states by time-changing electromagnetic fields is discussed, with particular emphasis on the nature of the required controls.
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