## Wikipedia - Resonanzfluoreszenz (de) resonance fluorescence

https://doi.org/10.1351/goldbook.R05335
@[email protected] from the primary excited atomic or molecular species at the @[email protected] of the exciting radiation (no @[email protected] within the excited manifold). This term is also used to designate the radiation emitted by an atom of the same @[email protected] as the longest one capable of exciting its @[email protected], e.g. $$122.6\ \text{nm}$$ in the case of the hydrogen atom, and $$253.7\ \text{nm}$$ in the case of the mercury atom.