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Application of tandem analyser to SIMS studies of hydrocarbon polymers
Author(s) -
Leggett G. J.,
Briggs D.,
Vickerman J. C.
Publication year - 1991
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.740171008
Subject(s) - fragmentation (computing) , chemistry , ion , low density polyethylene , analyser , static secondary ion mass spectrometry , analytical chemistry (journal) , mass spectrometry , secondary ion mass spectrometry , ethylene , collision induced dissociation , polymer , tandem mass spectrometry , atomic physics , organic chemistry , chromatography , physics , computer science , operating system , catalysis
The fragmentation of ions sputtered from the surface of low‐density poly(ethylene) (LDPE) has been investigated by studying their collisionally activated dissociation (CAD) when incident upon a variety of target gases in the collision cell of a triple quadrupole SIMS instrument. It was found that heavier targets resulted in more extensive CAD than was observed with lighter targets but that sulphur hexafluoride is inefficient target because of the amount opf energy that is transferred to its vibrational modes of motion (rather than being available to induce fragmentation in the parent ion.) The behaviour observed for an oxygen target was quite different to that observed for other targets (at higher pressures). In general oxygen induced markedly greater fragmentation for the small parent ions but xenon was the preferred target for the larger parent ions. Fragmentation patterns could readily be assembled for all of the parent ions observed in the SIMS spectrum of LDPE using the CAD data. There are good indications that the data obtained may assist in indentification of ion structures and in elucidation of general rules governing the fragmentation of organic materials during SIMS. For example, LDPE fragment ions were found to obey quite strictly the Even Electron Rule, a well‐known rule in mass spectrometry.