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Related to quadrupole moment: Nuclear Quadrupole Moment
quadrupole moment[′kwä·drə‚pōl ‚mō·mənt]
A quantity characterizing a distribution of charge or magnetization; it is given by integrating the product of the charge density or divergence of magnetization density, the second power of the distance from the origin, and a spherical harmonic Y*2 m over the charge or magnetization distribution.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.