Abstract
Fragmentation mechanism of the molecular ion of isopropyl methacrylate has been investigated by using kinetic energy release measurement, deuterium labelling technique and mass analyzed ion kinetic energy spectrometry. The methyl radical is eliminated from the molecular ion with a "hidden" hydrogen migration, not a simple cleavage. Further, it is demonstrated that the two hydrogen atoms in double hydrogen migration originate from the individual methyl groups in isopropyl group in the ion source.
