|
Basic
Type
|
Name
and Acronym
|
Ionizing
Agent
|
| Gas Phase | Electron Impact (EI) | Energetic electrons |
|
_ |
Chemical Ionization (CI) | Reagent gaseous ions |
|
_ |
Field Ionization (FI) | High-potential electrode |
|
Desorption |
Field Desorption (FD) | High-potential electrode |
|
_ |
Electrospray ionization (ESI) | High electrical field |
|
_ |
Matrix-assisted Laser beam desorption/ionization (MALDI) | |
| _ | Plasma Desorption (PD) | Fission fragments from radioisotope |
| _ | Fast Atom Bombardment | Energetic atomic beam |
| _ | Secondary Ion Mass Energetic beams of ions | Spectrometry (SIMS) |
| _ | Thermospray Ionization | High temperature |
Field GC/MS instruments used for environmental analysis typically use gas phase ionization sources such as electron impact.