Advanced Organic Chemistry: Mass spectrum of methanol
The mass spectrum of methanol
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 methanol
Interpreting the fragmentation pattern of the mass spectrum of methanol
[M]+ is the molecular ion peak (M) with an m/z of 32 corresponding to [CH4O]+, the original methanol molecule minus an electron, [CH3OH]+.
The small M+1 peak at m/z 33, corresponds to an ionised methanol molecule with a 13C atom in it i.e. an ionised methanol molecule of formula [13CH3OH]+
The most abundant ion of the molecule under mass spectrometry investigation (methanol) 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 methanol.
Formation of m/z 30 ion:
Formation of m/z 29 ion:
Formation of m/z 15 ion:
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