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2. Terminology and units
2.1 Stingray designation
Diagram lines can be designated by the arrival and departure levels of the corresponding electronic transitions, separated by a hyphen. This is the terminology recommended by IUPAC
However, it's convenient to continue using traditional symbols, which are much less cumbersome. These symbols were introduced by early experimenters, who were often led to attribute a recognition sign to an observed line whose origin was uncertain. On the whole, they are logical, and such terminology, codified...
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