An antiferroquadrupole is another name for an antiferromagnetic quadrupole - in which a magnet with two identical poles attracts rather than repels.

After quadrupole comes sextupole, which has six poles (three north and three south). Sextupoles are used in particle accelerators to correct for nonlinear focusing effects that can occur in quadrupole magnets.

An electric quadrupole is a configuration of four equal and opposite charges that creates a more complex pattern of electric field lines compared to a dipole. The intensity of the electric field for an electric quadrupole decreases more rapidly with distance compared to a dipole due to the higher order nature of the quadrupole moment.

Quadrupole nuclei are atomic nuclei that have a non-zero nuclear quadrupole moment due to an uneven distribution of charge within the nucleus. This property can affect the nuclear magnetic resonance (NMR) spectra of these nuclei by causing broadening and splitting of the NMR peaks. Examples of quadrupole nuclei include ^2H, ^14N, ^35Cl, and ^79Br.

Granit Konstantinovich Semin has written:

'Nuclear quadrupole resonance in chemistry' -- subject(s): Nuclear quadrupole resonance spectroscopy