Abstract
It has been observed that even under normal operating conditions in gas-chromatography-mass-spectrometry (gc-ms), the chromatographic peak corresponding to isoprene monomer may display the mass spectral characteristics of a dimer. It is shown that this cannot be due to any dimerisation occurring on the chromatographic column, but must be due to a reaction occurring in the mass spectrometer source. The reaction cross-section for this process must be quite large, since excessive source pressures were not used. The occurrence of processes such as this has serious implications when characterising chromatographic peaks from mass spectral library fits in gc-ms or pyrolysis-gc-ms.
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