Editing Analytical chemistry (section)

=== Mass spectrometry ===
{{further|Mass spectrometry}}
[[File:1 MV accelerator mass spectrometer.jpg|thumb|An [[Accelerator mass spectrometry|accelerator mass spectrometer]] used for [[radiocarbon dating]] and other analysis]]
Mass spectrometry measures [[mass-to-charge ratio]] of molecules using [[Electric field|electric]] and [[magnetic field]]s. In a mass spectrometer, a small amount of sample is ionized and converted to gaseous ions, where they are separated and analyzed according to their [[mass-to-charge ratio]]s.<ref name=":0" /> There are several ionization methods: [[electron ionization]], [[chemical ionization]], [[electrospray ionization]], fast atom bombardment, [[matrix-assisted laser desorption/ionization]], and others. Also, mass spectrometry is categorized by approaches of mass analyzers: [[magnetic-sector]], [[quadrupole mass analyzer]], [[quadrupole ion trap]], [[time-of-flight mass spectrometry|time-of-flight]], [[Fourier transform ion cyclotron resonance]], and so on.