magnetic dipole

[Relena]

How can the magnetic dipole of a molecule (Oxygen for example) affect radiation absorption?

[Creator]

How can the magnetic dipole of a molecule (Oxygen for example) affect radiation absorption?

In general I believe fine structure is possible involving rotational spectra (microwave range) even without a permeanent dipole moment in rotating molecules. Molecular rotation corresponds to a magnetic dipole moment which can interact with the spin mag. moment of electrons.

ex. see:http://en.wikipedia.org/wiki/Rotational_spectroscopy

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[Relena]

In general I believe fine structure is possible involving rotational spectra (microwave range) even without a permeanent dipole moment in rotating molecules. Molecular rotation corresponds to a magnetic dipole moment which can interact with the spin mag. moment of electrons.

Well I started to figure out the main idea

But can energy excitations using , for example, electron spin resonance induce or increase magnetic dipole moment ? thus shift (increase) the frequency of the absorbed spectrum ?