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The mass spectrum of bromomethane (methyl bromide)
Doc Brown's Chemistry Advanced Level Pre-University Chemistry Revision Study Notes for UK IB KS5 A/AS GCE advanced A level organic chemistry students US K12 grade 11 grade 12 organic chemistry courses involving molecular spectroscopy analysing mass spectra of bromomethane
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Bromomethane, CH3Br (methyl bromide)
Interpreting the fragmentation pattern of the mass spectrum of bromomethane
[M]+ is the molecular ion peak (M) with an m/z of 94 and 96 corresponding to [CH3Br]+, the original bromomethane molecule minus an electron.
The tiny M+1 peak at m/z 97, corresponds to an ionised bromomethane molecule with a 13C atom in it i.e. an ionised bromomethane molecule of formula [13CH381Br]+
The most abundant ion of the molecule under mass spectrometry investigation (bromomethane) is usually given an arbitrary value of 100, called the base ion peak, and all other abundances ('intensities') are measured against it.
Identifying the species giving the most prominent peaks (apart from M) in the fragmentation pattern of bromomethane.
Unless otherwise indicated, assume the carbon atoms in bromomethane are the 12C isotope.
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