An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 4 Search : quadrupole
quadrupole
  چهارقطبه   
cahârqotbé (#)

Fr.: quadrupôle   

A set of either two → electric dipoles or two → magnetic dipoles in close proximity to each other arranged with alternating polarities and acting as a single unit. Quadrupole interactions are much smaller than dipole interactions, but can allow transitions forbidden in dipole moment transitions.

From L. quadru-, variant of quadri- "four" + → pole, on the model of → dipole.

Cahâr, → four, + qotb, → pole + noun/nuance suffix .

quadrupole anisotropy
  نا-ایزوگردی ِ چهارقطبه   
nâ-izogardi-ye cahârqotbé

Fr.: anisotropie quadrupolaire   

The → anisotropy which is at the origin of the → cosmic microwave background polarization. The quadrupole anisotropy could arise from three types of perturbations: → scalar perturbation, → vector perturbation, and → tensor perturbation

quadrupole; → anisotropy.

quadrupole lens
  عدسی ِ چهارقطبه   
adasi-ye cahârqotbé

Fr.: lentille quadrupôle   

A device, consisting of four → electrodes or → magnetic poles arranged in alternating → polarity, that focuses a beam of → charged particles.

quadrupole; → lens.

quadrupole moment
  گشتاور ِ چهارقطبه   
gaštâvar-e cahârqotbé

Fr.: moment quadrupolaire   

A quantity characterizing an electric charge distribution, determined by the product of the charge density, the second power of the distance from the origin, and a spherical harmonic over the charge distribution.

quadrupole; → moment.