Template:ASMS analyzers
From Mass Spec Terms
Analyzers section from ASMS 1982
- Electrostatic analyzer
- A velocity focusing device composed of means for producing an electrostatic field perpendicular to the direction of ion travel. Effect is to bring to a common focus all ions of a given kinetic energy. Usually used in combination with a magnetic analyzer for mass analysis.
- Magnetic analyzer
- A direction focusing device composed of means for producing a magnetic field perpendicular to the direction of ion travel. Effect is to bring to a common focus all ions of a given momentum with the same mass to charge ratio.
- Quadrupole analyzer
- A mass filter consisting of means of creating a quadrupole fiel of a constant component and a varying component in such a manner as to allow transmission of only a selected mass-charge ratio,
- Time of flight analyzer
- A device consisting of a means to measure the flight time of particles with an equivalent kinetic energy over a fixed distance.
- Wien analyzer
- A velocity filter composed of means for creating crossed homogeneous electric and magnetic fields such that only ions of a fixed velocity are transmitted.
- Mass resonant analyzer
- A mass analyzer composed of means for mass dependent resonant energy transfer and measurement of the resonance frequency, power or ion current of the resonant ions. (The following are standard instrumental configurations utilizing one or more of the above techniques.)
- Double focusing analyzer
- The combination of a magnetic analyzer and electrostatic analyzer in either sequence to effect direction and velocity focusing.
- Ion cyclotron resonance analyzer
- A device to determine the mass of an ion by measuring its resonant frequency.
- Ion trap analyzer
- A mass resonance analyzer co'mposed of means for creating a three dimensional rotationally symmetric quadrupole field capable of storing ions at selected masses,
- Mass spectrometer configurations
- Multianalyzer instruments should be named or the analyzers in the sequence in which they are traversed by the ion beam, where B is for a magnetic analyzer, E for an electrostatic analyzer, Q for a quadrupole analyzer, TOF for time of flight analyzer, and ICR for an ion cyclotron resonance analyzer. For example, we have a BE mass spectrometer ("reversed" geometry double focusing instrument), BQ mass spectrometer (hybrid sector and quadrupole instrument), EB Q (high resolution followed by a quadrupole). Note that a triple quadrupole which has il'.!2, mass analyzers is a QQ mass spectrometer. Problem: Time of flight, simultaneously or sequentially with other mass analyzers.
