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An ion trap, used for precision measurements of radium ions, inside a vacuum chamber. View ports surrounding the chamber allow laser light to be directed into the trap. An ion trap is a combination of electric and/or magnetic fields used to capture charged particles — known as ions — often in a system isolated from an external environment.
The velocity of the charged particle after acceleration will not change since it moves in a field-free time-of-flight tube. The velocity of the particle can be determined in a time-of-flight tube since the length of the path (d) of the flight of the ion is known and the time of the flight of the ion (t) can be measured using a transient digitizer or time to digital converter.
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 also called radio frequency (RF) traps or Paul traps in honor of Wolfgang Paul , who invented the device [ 1 ] [ 2 ] and shared the Nobel Prize in Physics in 1989 for this work. [ 3 ]
A toroidal ion trap can be visualized as a linear quadrupole curved around and connected at the ends or as a cross-section of a 3D ion trap rotated on edge to form the toroid, donut-shaped trap. The trap can store large volumes of ions by distributing them throughout the ring-like trap structure. This toroidal shaped trap is a configuration ...
The RFQ trap is used convert the radioactive ion beam delivered by the ISOLDE facility into low-energy ion pulses, before it is injected into the MR-ToF mass spectrometer. [5] It does this by electrostatically decelerating the ions and then passing them through a buffer-gas -filled environment. [ 6 ]
This method of injection works well with pulsed sources such as MALDI but cannot be interfaced to continuous ion sources like electrospray. All commercial Orbitrap mass spectrometers utilize a curved linear trap for ion injection (C-trap). By rapidly ramping down trapping RF voltages and applying DC gradients across the C-trap, ions can be ...
The first (Q 1) and third (Q 3) quadrupoles act as mass filters, and the middle (q 2) quadrupole is employed as a collision cell. This collision cell is an RF-only quadrupole (non-mass filtering) using Ar, He, or N 2 gas (~10 −3 Torr, ~30 eV) for collision induced dissociation of selected parent ion(s) from Q 1.
Atmospheric pressure (AP) matrix-assisted laser desorption/ionization (MALDI) is an ionization technique (ion source) that in contrast to vacuum MALDI operates at normal atmospheric environment. [32] The main difference between vacuum MALDI and AP-MALDI is the pressure in which the ions are created.