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A systematic study of instrumental parameters affecting electron capture negative ion mass spectra
Author(s) -
Stemmler Elizabeth A.,
Hites Ronald A.
Publication year - 1988
Publication title -
biomedical and environmental mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0887-6134
DOI - 10.1002/bms.1200151204
Subject(s) - ion , mass spectrometry , ion source , mass spectrum , chemistry , spectral line , electron ionization , abundance (ecology) , analytical chemistry (journal) , atomic physics , ionization , physics , chromatography , organic chemistry , astronomy , fishery , biology
The problem of reproducing electron capture negative ion mass spectra has been addressed by studying parameters that affect negative ion abundance on a Hewlett Packard 5985B mass spectrometer. Parameters affecting negative ion formation in the ion source, such as ion source temperature, pressure, sample concentration and electron energy, were studied in conjunction with the effect of lenses used to extract and transmit ions to the quadruples. From these experiments, it was found that, in addition to ion source temperature, the ion focus potential has the most dramatic effect on the abundance of molecular ions relative to fragment ions like Cl − . With proper control, it was found that the relative abundance of ions from decafluorotriphenylphosphine could be reproduced over a period of one year.