Adjective
quadrupolar (comparative more quadrupolar, superlative most quadrupolar)
Of or pertaining to a quadrupole
Deuterium NMR spectra are especially informative in the solid state because of its relatively small quadrupole moment in comparison with those of bigger quadrupolar nuclei such as chlorine-35, for example. Source: Internet
Ionic character in covalent bonds can be directly measured for atoms having quadrupolar nuclei ( 2 H, 14 N, 81,79 Br, 35,37 Cl or 127 I). Source: Internet