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Ion mobility spectrometry-mass spectrometry (IMS/MS or IMMS) is a technique where ions are first separated by drift time through some neutral gas under an applied electrical potential gradient before being introduced into a mass spectrometer. [43] Drift time is a measure of the collisional cross section relative to the charge of the ion.
Example of a GC–MS instrument. Gas chromatography–mass spectrometry (GC–MS) is an analytical method that combines the features of gas-chromatography and mass spectrometry to identify different substances within a test sample. [1]
For example, a sector instrument can be combined with a collision quadrupole and quadrupole mass analyzer to form a hybrid instrument. [7] A mass-selecting quadrupole and collision quadrupole with time-of-flight device as the second mass selection stage is a hybrid known as a quadrupole time-of-flight mass spectrometer (QTOF MS).
Ion trajectories in an Orbitrap mass spectrometer. In mass spectrometry, Orbitrap is an ion trap mass analyzer consisting of an outer barrel-like electrode and a coaxial inner spindle-like electrode that traps ions in an orbital motion around the spindle.
Sector instruments tend to surpass the TQMS in mass resolution and mass range. [3] However, the triple quadrupole has the advantage of being cheaper, easy to operate and highly efficient. [ 3 ] Also, when operated in the selected reaction monitoring mode, the TQMS has superior detection sensitivity as well as quantification. [ 3 ]
The sector instrument geometry consists of a 127.30° () electric sector without an initial drift length followed by a 60° magnetic sector with the same direction of curvature. Sometimes called a "Bainbridge mass spectrometer," this configuration is often used to determine isotopic masses.
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