Let the strength of the nth multipole term of electromagnetic radiation be denoted 
and 
respectively. Let the radiated power of the nth multipole be denoted 
or 
Then
The strength of multipole radiation most commonly decreases in the following order: (1) electric dipole, (2) electric quadrupole, magnetic dipole, (3) electric octupole, magnetic quadrupole, etc. An exception is rotational transitions of the O2 molecule, which has stronger magnetic dipole radiation (due to its unpaired electrons) than electric dipole (since it is a symmetric, homonuclear molecule).
and respectively. Let the radiated power of the nth multipole be denoted or Then (1)
(2)
(3)
The strength of multipole radiation most commonly decreases in the following order: (1) electric dipole, (2) electric quadrupole, magnetic dipole, (3) electric octupole, magnetic quadrupole, etc. An exception is rotational transitions of the O2 molecule, which has stronger magnetic dipole radiation (due to its unpaired electrons) than electric dipole (since it is a symmetric, homonuclear molecule).
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