Yb
Dark Green - Rare Earth
https://www.americanelements.com/yb.html
X-ray Excitation Triggers Ytterbium Anomalous Emission in CaF2:Yb but Not in SrF2:Yb.
10.1021/acs.jpclett.7b00262
High-power 1018 nm ytterbium-doped fiber laser with output of 805 W.
10.1364/OL.42.001193
Crystal structures of two ytterbium(III) complexes comprising alkynylamidinate ligands.
10.1107/S2056989016012135