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resonance line
spectral line that is the result of direct transition from an excited energy level to the ground level, or vice versa, without going through intermediate levels
EXAMPLE For mercury, the resonance line is at
Note 1 to entry: This entry was numbered 845-04-35 in IEC 60050-845:1987.
Note 2 to entry: This entry was numbered 17-1092 in CIE S 017:2011.