Isotopes: Br and Cl

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Figure MS5. Mass spectrum of chlorobenzene.

Source: SDBSWeb : http://riodb01.ibase.aist.go.jp/sdbs/ (National Institute of Advanced Industrial Science and Technology of Japan, 22 August 2008)

Chlorinated compounds show an M+2 peak that is 1/3 as large as the M+ peak.

Note also that halogens are easily lost during mass spectrometry. If you subtract the mass of the halogen from the molecular ion mass, you will often find a peak that corresponds to the remainder of the structure.