- Conference date: 27–31 October 2008
- Location: Beijing (China)
This paper includes a discussion and classification of what is generally referred to as “‘Forbidden lines”’ in atomic physics. Historical and important examples are reviewed, in light of their challenge to computations and remaining disagreements between experiment and theory. We also review some recent results on what could be labeled the third generation of unexpected transitions, induced by hyperfine quenching.
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