A quadrupole or quadrapole is one of a sequence of configurations of things like electric charge or current, or gravitational mass that can exist in ideal form, but it is usually just part of a multipole expansion of a more complex structure reflecting various orders of complexity.

The quadrupole moment is a measure of the deviation of an object's charge distribution from spherical symmetry. It is a higher-order multipole moment that describes the degree to which an object's charge distribution departs from a perfect sphere or point charge.

2024年5月13日 · 𝑄 Ü Ý is called the “quadrupole moment,” also the “quadrupole moment tensor.” It is a collection of nine numbers (𝑖 and 𝑗 each can be 𝑥, 𝑦, 𝑧) which can be written as a 3×3 matrix, just like 𝐩 can be written as a 3-element vector.

The system possesses what is known as a quadrupole moment. While a single charge is a scalar quantity, and a dipole moment is a vector quantity, the quadrupole moment is a second order symmetric tensor.

While a single charge is a scalar quantity, and a dipole moment is a vector quantity, the quadrupole moment is a second order symmetric tensor. It has no net charge and no net dipole moment. Unlike a dipole, it will experience neither a net force nor a net torque in any uniform field.

2024年3月21日 · In electromagnetism, the quadrupole moment describes the deviation of a system’s charge distribution from perfect sphericity, affecting the field it generates. Gravitational quadrupole moments relate to a mass distribution’s deviation from spherical symmetry and influence the gravitational field.

2024年5月29日 · A quadrupole moment is a measure of the second order (quadratic) distribution of a physical quantity (like charge or mass) away from its center. To understand this, imagine breaking down the arrangement of charge or mass within …

A general distribution of electric charge may be characterized by its net charge, by its dipole moment, its quadrupole moment and higher order moments. An elementary quadrupole can be represented as two dipoles oriented antiparallel.

Operated with U = 0, quadrupole becomes a broad filter Such “RF-only” quads are an important tool for transferring ions between regions of mass spectrometers.

…of focusing magnet is a quadrupole, a magnet built with four poles (two norths and two souths) arranged opposite each other. This arrangement pushes particles toward the centre in one direction but allows them to spread in the perpendicular direction.