Advanced Organic Chemistry: Mass spectrum of bromoethane
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The mass spectrum of bromoethane
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 bromoethane
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Interpreting the fragmentation pattern of the mass spectrum of bromoethane
[M]+ is the molecular ion peak (M) with an m/z of 108 and 110 corresponding to [C2H579Br]+ and [C2H579Br]+ the original bromoethane molecule minus an electron, [CH3CH2Br]+.
The small M+1 and M+2 peaks at m/z 109 and 111, corresponds to an ionised bromoethane molecule with one 13C atom in it i.e. an ionised bromoethane molecule of formula [13C12CH579Br]+ and [13C12CH581Br]+.
The most abundant ion of the molecule under mass spectrometry investigation (bromoethane) 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 bromoethane.
Unless otherwise indicated, assume the carbon atoms in the bromoethane molecule are the 12C isotope.
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