dipole moment

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Related to Dipole moments: Molecular dipole moment

Dipole moment

A mathematical quantity characteristic of a dipole unit equal to the product of one of its charges times the vector distance separating the charges. The dipole moment μ associated with a distribution of

electric charges qi is given by where r i is the vector to the charge qi. For systems with a net charge (for example, positive), the origin is taken at the mean position of the positive charges (and vice versa). Dipole moments have the dimensions coulomb-meters. Molecular dipole moments were previously expressed in debye units, where 1 debye = 3.336 × 10-30 C · m. See Dipole

McGraw-Hill Concise Encyclopedia of Physics. © 2002 by The McGraw-Hill Companies, Inc.

dipole moment

[′dī‚pōl ‚mō·mənt]
(physical chemistry)
The vector sum of the bond moments in a molecule, a measure of the polarity of the molecule.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The magnetic potential and magnetic field produced by a dipole normal to the interface is proportional to the excess magnetic dipole moment, regardless of how those dipole moments are split microscopically on either side of the interface.
Jens and Yoshi Kawashima, another frequent visitor to the NIST lab, also worked on the spectrum of conformers I and II of glycine to determine the dipole moments and resolve the 14N hyperfine structure.
"There are good theoretical reasons to think that it isn't too far away," says physicist Larry Hunter of Amherst College in Massachusetts, who has been hunting the electron's electric dipole moment since the 1980s.
The stability of 1,3-dibromonaphthalene was higher than that of the 1,4-dibomonaphthalene, the formation of 1,3-dibromonaphthalene was favorable and the dipole moment of 1,3-dibromonaphthalene,1,4-dibomonaphthalene as a result of the synthesis of 1,3-dibromonaphthalene properly.
Here, [gamma] is adsorbed on the surface concentration and [[mu].sub.normal] is the dipole moment component perpendicular to the direction Ti[O.sub.2] surface (where the [[mu].sub.normal] was the x-axis direction), [[epsilon].sub.0] is the gas permittivity, and [epsilon] is the dielectric constant of the organic monolayer.
Dipole moments of the functional groups [12] Functional group Group dipole moment [D] Alkyl (-[CH.sub.3]) 0.00 Hydroxyl (-OH) 1.70 Carbonyl (-CO-) 2.49 Aldehyde (-CHO) 2.49 Carboxyl (-COOH) 1.63 Table 2.
One difficulty for calculating dipole moments should the positions and magnitudes of partial charges used in the molecule [16].
DeMille et al., "Order of magnitude smaller limit on the electric dipole moment of the electron," Science, vol.
The value of the phase difference between the induced dipole moment m, and the field vector E controls the magnitude of the torque, reaching maximum when the phase difference is 9"", and zero when the phase is zero.
These basis functions belong to a level higher than that of the dipole moments used to model the geometry in the initial step of the DM approach.
The easier the escape is, the larger dipole moment directing to outside is formed, the lower work function is.
Differently from the calculated polarizabilities and second-order hyperpolarizabilities, both the magnitude (Table 1) and direction (Figure 1) of the [[beta].sub.[mu]] vector are noticeably affected by the structural features, almost following the behaviour found for the dipole moments. In fact, for the antigauche form, the [[beta].sub.[mu]] property which is aligned along the y-axis is predicted to be smaller than that for the syn-gauche rotamer (with [[beta].sub.[mu]] aligned along the z-axis) by ca.