quadrupole mass filter


Also found in: Acronyms.

quadrupole mass filter

a four-pole magnet system used to separate charged mass fragments in a mass spectrometer.

quadrupole mass filter

A term of art used in mass spectrometry for a specific combination of direct current (DC) and radiofrequency (RF) voltages which, when applied to four parallel metal rods, creates a filtering device that limits the transmission of ions to a certain defined m/z value. Changing the ratio of the voltages changes the m/z value of ions that pass through to the detector. The quadrupole mass filter can also be operated in other modes, such as passing a mass range of ions to the detector. If only the RF portion of the voltage is applied to the rods, virtually all ions pass to the detector.
References in periodicals archive ?
In ordinary quadrupole mass filters, metastable ions cannot be studied because they are not distinguished from normal ions.
The CIS ionizer sits on top of the quadrupole mass filter and consists of a short, gas-tight tube with two small openings for the entrance of electrons and the exit of ions.
quadrupole mass filter vs magnetic /electric sector).
TOF systems' dynamic working range is typically six orders of magnitude, whereas quadrupole mass filter spectrometers typically go to eight orders of magnitude.
Nevertheless, several groups have reported that the QIT has full-scan detection limits similar to those of a quadrupole mass filter (QMF) operated in the selected-ion monitoring (SIM) mode for drug testing [4,5].
In 1996, the HP Model 5973 introduced the gold-plated hyperbolic quartz quadrupole mass filter, a breakthrough in instrument stability and performance.
Each instrument in the range features the MAX-HM quadrupole mass filter assembly, a precision-machined 9.
The prototypical RGA consists of an open ion source, a quadrupole mass filter, and a Faraday cup ion detector that may or may not be enhanced by an electron multiplier.
The HPLC system with high-resolution time-of and upstream quadrupole mass filter (Q-TOF) should be suitable for the analytical separation and detection of polar organic pollutants in extracts of water and solid samples in trace analysis area.
This unit is equipped with a quadrupole mass filter coupled with a high resolution mass spectrometer.
negative mode at atmospheric pressure, two quadrupole mass filters coupled to the collision whole and vacuum