# Zeman effect

1. Apr 27, 2009

### hagopbul

hello all

how we can study the zeeman effect on molecule what is the bases to do it

or it is the same for atoms.

2. Apr 29, 2009

### sokrates

Zeeman effect is the splitting of the energy levels in a system due to an applied (or effective - in the case of SO interaction) magnetic field.

Normally, all the energy levels are spin-degenerate in a molecule. And the up-spin and down-spin levels respond differently to a magnetic field.

This splitting is given by:

$$\Delta E = \mu_B \cdot \overline{B}$$

where mu_b is the Bohr magneton.

You may want to check Stern-Gerlach experiment and Dirac equation if you want to delve into the exact formulation. I guess that's where it's fundamentally derived.