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Black canyons for ions stored in an ion‐trap mass spectrometer
Author(s) -
Eades Donald M.,
Yost Richard A.,
Cooks R. G.
Publication year - 1992
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.1290060908
Subject(s) - chemistry , ion , quadrupole ion trap , ion trap , mass spectrometry , mass spectrum , dissociation (chemistry) , triple quadrupole mass spectrometer , quadrupole mass analyzer , ionization , analytical chemistry (journal) , atomic physics , reagent , tandem mass spectrometry , selected reaction monitoring , physics , organic chemistry , chromatography
Abstract Effects from higher order non‐linear resonances, ‘black canyons’, have been observed for ions stored within the quadrupole ion‐trap mass spectrometer. At specific q z values, higher‐order field effects were observed to cause decreased intensity of chemical ionization (CI) reagent ions, due to ineffcient storage, as well as collision‐induced dissociation. Efects have been observed, whether or not the CI reagent ions are mass‐selected, and exibit increased severity with longer storage times. Previous reports have shown ‘black holes’ due to inefficient storage of product ions in tandem (MS/MS) spectra, but have reported no such effects in normal mass spectra. Without employing resonant excitation, higher‐order field effects were investigated and found to occur continuously along iso‐β z lines for β z = 1/3, 1/2, and 2/3. Described in this paper are the directs from higher‐order fields on ions stored at specific a z values, and indirec effects by those ions. Also described in this paper is new evidence for ‘black canyons’ occurring at β z = 1/3 at negative a z values.