# 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 don't see why the electron spin affected the number of lines to go up in some atoms and not in others. The electron(s) on the H atom also have spin.

Thank you.

2. Apr 14, 2014

### Staff: Mentor

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 ($S=1/2$).