Magnetic sector mass spectrometers electrostatic analyzer

ESA Electrostatic analyzer (part of magnetic sector mass spectrometer)... 

By combining a magnetic-sector mass analyzer with an electrostatic analyzer (often termed a double-sector or double-focusing mass spectrometer), a significant improvement in resolution is realized. Such a double-focusing instrument can achieve a resolution of the order of 100,OOO.The double-focusing magnetic mass analyzer utilizes two independent sectors. In addition to the... 

Mass spectrometer configuration. Multianalyzer instruments should be named for the analyzers in the sequence in which they are traversed by the ion beam, where B is a magnetic analyzer, E is an electrostatic analyzer, Q is a quadrupole analyzer, TOP is a time-of-flight analyzer, and ICR is an ion cyclotron resonance analyzer. For example BE mass spectrometer (reversed-geometry double-focusing instrument), BQ mass spectrometer (hybrid sector and quadrupole instrument), EBQ (double-focusing instrument followed by a quadrupole). 

BE double-focusing mass spectrometer using a magnetic sector analyzer linked to an electrostatic... 

EB double-focusing mass spectrometer using an electrostatic analyzer linked to a magnetic sector... 

Instruments using as analyzer a B,E arrangement are consequently called double-focusing mass spectrometers (see Fig. 2.5). Under these conditions, what are called first-order aberrations are overcome however, further aberrations of the ion optics are still present, due to the fringing fields present either at the magnetic or electrostatic sector levels. To reduce these undesired effects, usually electrostatic lens are placed in the field-free region of the instrument. 

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