# Why does the anomalous Zeeman effect not show up on some atoms?

1. Apr 12, 2014

### carllacan

Why does the "anomalous" Zeeman effect not show up on some atoms?

I guess that that's a quote from HyperPhysics. I must say that I don't get it either: the normal Zeeman effect is seen in states with $S=0$ (such as in helium), which is not the case for hydrogen ($S=1/2$).