Quadrupole mass spectrometers are perhaps the simplest of mass spec instruments. Functioning effectively like a radio, the quadrupole MS – so-named because of its four charged rods, which run parallel to the flight paths of the ions it measures – filter ions by mass-to-charge ratio (m/z) by altering the voltages in the rods. Quadrupole mass spectrometers are available in a variety of formats, including a single quadrupole mass spectrometer, a triple quadrupole MS (three quadrupoles arranged in tandem), and a Q-TOF (a triple quad variant in which the third quadrupole is replaced with a time-of-flight mass analyzer).
Quadrupole mass analyzers are often used for targeted, quantitative applications and can be used either to measure one or a few given ions in a mixture, or to scan across a range of m/z values. Depending on the configuration, they can facilitate both MS and MS/MS applications. For instance, in a triple-quadrupole mass spectrometer, you can select ions for analysis in the first quadrupole, fragment them by collision with a gas in the second quadrupole, and analyze the resulting fragmentation ions in the third quadrupole.
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Shimadzu
- EI, CI, NCI
- Metal quadrupole with pre-rod
- 20,000 u/sec
- 1.5 to 1090 m/z
Shimadzu
- ESI, APCI, Dual Ionization
- Single Quadrupole
- 15,000 u/sec
- m/z 10 to 2000
Shimadzu
- ESI, APCI, Dual Ionization
- Single Quadrupole
- 15,000 u/sec
- Inquire
Shimadzu
- ESI, APCI, Dual Ionization
- Q1 & Q3 are molybdenum hyperbolic mass filters with pre-rods; Q1 includes post-rods
- 30,000 u/sec
- 2 to 2000 m/z
Shimadzu
- ESI probe with focus electrodes
- Triple quadrupole
- Max. 30,000 u/sec (in all scan modes)
(0.1 u step: 300,000 data points/sec) - m/z 2 to 2,000
Shimadzu
- ESI, APCI, Dual Ionization
- Q1 & Q3 are molybdenum hyperbolic mass filters with pre-rods; Q1 includes post-rods
- 30,000 u/sec
- 2 to 2000 m/z
Shimadzu
- ESI, APCI, DUIS, Micro
- Quadrupole Time-of-Flight (Q-TOF)
- Up to 100 Hz
- m/z 10 to 40,000
Shimadzu
- ESI, APCI, DUIS, Micro
- Quadrupole Time-of-Flight (Q-TOF)
- Inquire
- Inquire
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