All Mie coefficients depend on the frequency and have maximums when the denominator is close to zero (exact equality to zero is achieved for complex frequencies). In this case, it is possible, that the contribution of one specific harmonic dominates in scattering. Then at large distances from the particle, the radiation pattern of the scattered field will be similar to the corresponding radiation pattern of the angular part of vector spherical harmonics. The harmonics formula_67 correspond to electric dipoles (if the contribution of this harmonic dominates in the expansion of the electric field, then the field is similar to the electric dipole field), formula_68 correspond to the electric field of the magnetic dipole, formula_69 and formula_70 - electric and magnetic quadrupoles, formula_71 and formula_72 - octupoles, and so on. The maxima of the scattering coefficients (as well as the change of their phase to formula_73) are called multipole resonances.