https://doi.org/10.1351/goldbook.R05339
Lamp emitting resonance radiation of atoms and their ions. Depending on the requirements, the lamp is filled either with pure vapour of the element or with a mixture of it and other gases.
Note: Examples are: $\ce{Hg}$ (253.7 and 184.9 \(\rm{nm}\)), $\ce{Cd}$ (228.8 and 643.8 \(\rm{nm}\)), $\ce{Na}$ (589.0 \(\rm{nm}\)), $\ce{Zn}$ (213.8, 330.3, 334.5, and 636.2 \(\rm{nm}\)), $\ce{Kr}$ (116.5 and 123.6 \(\rm{nm}\)), $\ce{Xe}$ (129.6 and 147.0 \(\rm{nm}\)).