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Study of the mechanism of direct laser desorption/ionisation for some small organic molecules (M < 400 Daltons)
Author(s) -
Benazouz M.,
Hakim B.,
Debrun J. L.,
Strivay D.,
Weber G.
Publication year - 1999
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/(sici)1097-0231(19991215)13:23<2302::aid-rcm789>3.0.co;2-#
Subject(s) - chemistry , desorption , ionization , mechanism (biology) , laser , organic molecules , molecule , analytical chemistry (journal) , mass spectrometry , chromatography , organic chemistry , ion , optics , adsorption , physics , philosophy , epistemology
Aspects of direct laser desorption/ionisation have been studied for three molecules, aminotriazole (positive ion), dinoterb and ioxynil (negative ion). The samples are deposited on metallic substrates, and a nitrogen laser is used for desorption/ionisation; ion yields are measured with a time‐of‐flight mass spectrometer. Previous work had shown that ion yields can strongly vary from one substrate to another, and that this variation does not reflect the (calculated) metal surface temperatures. New results obtained in this work indicate that the desorption/ionisation mechanism is linked to the physical state of the substrate surface. Copyright © 1999 John Wiley & Sons, Ltd.