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...

In mass spectrometry, the quadrupole mass analyzer (or quadrupole mass filter) is a type of mass analyzer originally conceived by Nobel laureate Wolfgang...

A triple quadrupole mass spectrometer (TQMS), is a tandem mass spectrometer consisting of two quadrupole mass analyzers in series, with a (non-mass-resolving)...

Quadrupole magnets, abbreviated as Q-magnets, consist of groups of four magnets laid out so that in the planar multipole expansion of the field, the dipole...

Nuclear quadrupole resonance spectroscopy or NQR is a chemical analysis technique related to nuclear magnetic resonance (NMR). Unlike NMR, NQR transitions...

In experimental physics, a quadrupole ion trap or paul trap is a type of ion trap that uses dynamic electric fields to trap charged particles. They are...

A quadrupole mass analyzer acts as a mass-selective filter and is closely related to the quadrupole ion trap, particularly the linear quadrupole ion...

quadrupole formula describes the rate at which gravitational waves are emitted from a system of masses based on the change of the (mass) quadrupole moment...

instrumentation setups include triple quadrupole mass spectrometer (QqQ), multi-sector mass spectrometer, ion trap, quadrupole–time of flight (Q-TOF), Fourier...

Quadrupole splitting is an example of a hyperfine interaction found in gamma-ray spectroscopy, in the circumstance where nuclei with a non-radially-symmetric...

described. A triple quadrupole mass spectrometer with the final quadrupole replaced by a time-of-flight device is known as a quadrupole time-of-flight instrument...

quadrupole (RFQ) is a linear accelerator component generally used at low beam energies, roughly 2keV to 3MeV. It is similar in layout to a quadrupole...

electron densities (also called the chemical shift in older literature), quadrupole splitting due to atomic-scale electric field gradients; and magnetic splitting...

molecules together are van der Waals forces, dipole–dipole interactions, quadrupole interactions, π–π interactions, hydrogen bonding, halogen bonding, London...

A Helmholtz coil is a device for producing a region of nearly uniform magnetic field, named after the German physicist Hermann von Helmholtz. It consists...

or rectangular tubes in series along an axis. The quadrupole lens consists of two single quadrupoles turned 90° with respect to each other. Let z be the...

is an example of noncovalent bonding between a monopole (cation) and a quadrupole (π system). Bonding energies are significant, with solution-phase values...

vertical) can be obtained by varying the field strength of a quadrupole (or quadrupoles) upstream of a monitor (i.e., a wire or a screen). The properties...

opposing charges brought close together and a quadrupole to two dipoles brought together. A quadrupole field is shown in the lower figure on the right...

quadrupole trap system to enhance ion-molecule reactions, thus it can be used to study spectroscopy of stored ions. The LIT uses a set of quadrupole rods...

fragmentation in peptides. In a triple quadrupole mass spectrometer there are three quadrupoles. The first quadrupole termed "Q1" can act as a mass filter...

zero quadrupole moment) will not radiate, in agreement with Birkhoff's theorem. More technically, the second time derivative of the quadrupole moment...

field generated by the electrons and the energy of the nuclear electric quadrupole moment in the electric field gradient due to the distribution of charge...

QTof 2016 Quadrupole Time-of-Flight Ion-mobility Spectrometry Xevo G2-XS QTof 2016 Quadrupole Time-of-Flight Xevo TQ-XS 2016 Triple quadrupole Xevo TQ-S...

objects of NQR nuclear quadrupole resonance and NMR nuclear magnetic resonance studies. Interactions between the nuclear quadrupole moments Q and the electric...

dipole resonance (GDR) in photonuclear reactions, and in 1972 the giant quadrupole resonance (GQR) was discovered, and in 1977 the giant monopole resonance...

distribution and thus resonance broadening as a result of a nonzero nuclear quadrupole moment and resultant quadrupolar relaxation. The other chlorine isotopes...

{Q(n)} } E Electric quadrupole ( x , t ) = Z 0 ( H Electric quadrupole × n ) {\displaystyle \mathbf {E} _{\text{Electric quadrupole}}(\mathbf {x} ,t)=Z_{0}(\mathbf...

matrix background. The first quadrupole (Q1) is connected with a collision cell (Q2) and another quadrupole (Q3). Both quadrupoles can be used in scanning...

The quantum cylindrical quadrupole is a solution to the Schrödinger equation, i ℏ ∂ ∂ t ψ ( x , t ) = − ℏ 2 2 m ∂ 2 ∂ x 2 ψ ( x , t ) + V ( x ) ψ ( x ...