In which orbital does the splitting occur?

The Zeeman effect is the splitting of a spectral line into multiple components when a static magnetic field is present. It's named after Dutch physicist Pieter Zeeman, who discovered it in 1896 and won a Nobel prize for his discovery. The Zeeman effect is a physical phenomenon that underlies EPR spectroscopy. It involves the interaction between the magnetic moment of an unpaired electron and an external magnetic field. This interaction produces the splitting of the energy levels of the unpaired electron.  The Zeeman effect can be observed when radiation, such as light, originates in a... Show more

The Zeeman effect is the splitting of a spectral line into multiple components when a static magnetic field is present. It's named after Dutch physicist Pieter Zeeman, who discovered it in 1896 and won a Nobel prize for his discovery.
The Zeeman effect is a physical phenomenon that underlies EPR spectroscopy. It involves the interaction between the magnetic moment of an unpaired electron and an external magnetic field. This interaction produces the splitting of the energy levels of the unpaired electron. 
The Zeeman effect can be observed when radiation, such as light, originates in a magnetic field. The effect occurs when several electron orbitals in the same shell, which normally have the same energy level, have different energies. 
The basic unit of splitting is the Bohr Magneton, which contains the charge to mass ratio of the electron.

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