Fragmentation at and above surfaces in SIMS: Effects of biomolecular yield enhancing surface modifications
作者： Stefan L. Luxembourg , Ron M.A. Heeren
DOI: 10.1016/J.IJMS.2005.12.048
关键词:
摘要: Abstract Matrix-enhanced SIMS and metal-assisted are successfully employed to increase the organic ion yield in SIMS. In this study we compare kinetic energy distributions obtained for SIMS, ME-SIMS MetA-SIMS sputtering of molecular ions. comparison distributions, those display larger deficits, indicative entrainment analyte ions by matrix molecules or collisions taking place above sample surface. case high broadening is observed, resulting from stopping power gold used. A selection substituted benzylpyridinium salts used investigate effect internal reduction ME-SIMS. Kinetic were separate daughter formed region unimolecular decay on nanosecond timescales, first tens micrometers The longer-timescale was monitored changing acceptance window mass spectrometer From rate constants energies precursor decaying timescales determined using RRKM theory. Within framework model results indicate an extension collision cascade over a wider area than
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