Laser desorption in a quadrupole ion trap: mixture analysis using positive and negative ions

We demonstrate the generation of both negative and positive ions by laser desorption directly within a quadrupole ion trap and the application of this method to analyze complex samples containing compounds such as explosive residues, metal complexes, and polynuclear aromatic hydrocarbons. In some ca...

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Bibliographic Details
Published in:Analytical chemistry (Washington) 1993-06, Vol.65 (11), p.1609-1614
Main Authors: Alexander, M. L, Hemberger, P. H, Cisper, M. E, Nogar, N. S
Format: Article
Language:English
Subjects:
400102 - Chemical & Spectral Procedures
400201 - Chemical & Physicochemical Properties
400500 - Photochemistry
AMMONIUM COMPOUNDS
Analytical chemistry
AROMATICS
Chemistry
COMPLEXES
DESORPTION
DISPERSIONS
Exact sciences and technology
EXPLOSIVES
HYDROCARBONS
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
LASERS
MASS SPECTROSCOPY
MIXTURES
ORGANIC COMPOUNDS
ORGANOMETALLIC COMPOUNDS
POLYCYCLIC AROMATIC HYDROCARBONS
SORPTION
Spectrometric and optical methods
SPECTROSCOPY
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Summary:We demonstrate the generation of both negative and positive ions by laser desorption directly within a quadrupole ion trap and the application of this method to analyze complex samples containing compounds such as explosive residues, metal complexes, and polynuclear aromatic hydrocarbons. In some cases the ability to rapidly switch between positive and negative ion modes provides sufficient specificity to distinguish different compounds of a mixture with a single stage of mass spectrometry. In other experiments, we combine intensity variation studies with tandem mass spectrometry experiments and positive and negative ion detection to further enhance specificity. 55 refs., 8 figs., 1 tab.
ISSN:0003-2700
1520-6882
DOI:10.1021/ac00059a021