Abstract
The phenomenon of the excitation of multiply-excited states in beam-foil spectroscopy is reviewed:
1. Introduction, early B.F.S. work.
2. (a) Earlier non-beam-foil observations of multiply-excited states;
(b) Theoretical development of multiply-excited systems;
(c) Experiments and theory since 1961.
3. B.F.S. photon measurements:
(a) He I isoelectronic sequence.
(b) Li I isoelectronic sequence.
(c) Be I and heavier isoelectronic sequences.
(d) Transition probabilities, comparison of theory and experiment.
4. B.F.S. electron measurements.
5. The beam-foil interaction process.
6. Present problems and future aspects.
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