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Advanced Organic Chemistry: Mass spectrum of ethene (ethylene)
Interpreting the mass spectrum of ethene (ethylene)
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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 ethene
See also
comparing the infrared, mass, 1H NMR and 13C NMR spectra of ethane and
ethene
Ethene
C2H4
![]() ![]() Interpreting the fragmentation pattern of the mass spectrum of ethene [M]+ is the molecular ion peak (M) with an m/z of 28 corresponding to [C2H6]+, the original ethene molecule minus an electron, [CH2=CH2]+. The small M+1 peak at m/z 29, corresponds to an ionised ethene molecule with one 13C atom in it i.e. an ionised ethene molecule of formula [13C12CH4]+
The most abundant ion of the molecule under mass spectrometry investigation (ethene) is usually given an arbitrary abundance 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 ethene. Unless otherwise indicated, assume the carbon atoms in ethene are the 12C isotope. Some of the possible positive ions, [molecular fragment]+, formed in the mass spectrometry of ethene.
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