Ionisation Technique | Abbreviation | Mass Range* | Polarity | Instrument(s) | Typical Resolution | Typical Mass Accuracy |
Electron Ionisation | EI | 100-850 Da | +ve | Autospec | 3,500 | < 5 ppm |
Chemical Ionisation | CI | 100-850 Da | +ve | Autospec | 3,500 | < 5ppm |
Electrospray Ionisation | ESI | m/z 100-6000 | +ve/-ve | Esquire
6000 micrOTOF FTICR |
<1,000 15,000 80,000 |
no
acc-mass < 1ppm internal, < 3ppm external < 2ppm |
Nanospray Ionisation | m/z 100-3000 | +ve/-ve | Synapt | <20,000 | < 2ppm | |
Matrix-assisted
Laser Desorption/Ionsation |
MALDI | 100-500,000 | +ve/-ve | ABI4700 UltrafleXtreme |
5,000 25,000 |
no
acc-mass < 5ppm |