quadrupole moment


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Related to quadrupole moment: Nuclear Quadrupole Moment

quadrupole moment

[′kwä·drə‚pōl ‚mō·mənt]
(electromagnetism)
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.
References in periodicals archive ?
"The edges of a QTI are not conductive like you would see in a typical TI," Bahl said, "Instead only the corners are active, that is, the edges of the edges, and are analogous to the four localized point charges that would form what is known as a quadrupole moment. Exactly as Taylor and Wladimir predicted."
was first applied to extract the intrinsic quadrupole moment [Q.sub.0].
By substituting the calculated bandhead moment of inertia [J.sub.0] in Grodzins formula equation (23), we adjusted the proportional constant c(Z) for each yrast SD band and extracted the deformation parameter [[beta].sub.2] and then calculated the transition quadrupole moment Q which is related to the ratio X of the major to minor axis.
Thus, the quadrupole moment vanishes when the gap closes up, [alpha] [right arrow] 0, as expected.
The quadrupole moment contributed by the magnetic dipole formed by the gap is [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII].
The interaction of the atomic quadrupole moment with external electric-field gradients, for example those generated by the electrodes of an ion trap, is analogous to the interaction of a nuclear quadrupole moment with the electric field gradients due to the atomic electrons.
The quadrupole moment [theta]([gamma], J) of an atomic level \[gamma]J[greater than] is defined by the diagonal matrix element in the state with maximum [M.sub.j]:
(1) [Mathematical Expression Omitted] [T.sub.1] = spin-lattice relaxation time; [T.sub.2] = spin-spin relaxation time; [[tau].sub.c] reorientational correlation time; eQ = electrical quadrupole moment; eq = gradient of the electrical field at the nucleus; K is a constant factor; and h = Planck's constant.
The calculated [equations 12, 13] electric quadrupole moment [Q.sub.0] and deformation parameter [[beta].sub.2] are given in Table 4.