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:
Hg
(253.7 and 184.9
),
Cd (228.8 and 643.8
),
Na (589.0 
),Zn (213.8, 330.3, 334.5, and 636.2
),Kr (116.5 and 123.6 
),Xe (129.6 and 147.0 
).
),
Cd (228.8 and 643.8
),
Na (589.0 ),Zn (213.8, 330.3, 334.5, and 636.2
),Kr (116.5 and 123.6 ),Xe (129.6 and 147.0 ).Source:
PAC, 2007, 79, 293
(Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006))
on page 415