期刊
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
卷 240, 期 2, 页码 101-105出版社
ELSEVIER
DOI: 10.1016/j.ijms.2004.10.011
关键词
MALD; adducts; collisional cooling; ion-molecule reactions; clusters
Experiments were carried out to gain insight into the mechanism of matrix adduct formation in matrix-assisted laser desorption/ionization (MALDI) conducted at elevated pressures. Two theories of matrix adduct formation were considered: incomplete cluster evaporation and the so called 'poisoning' model. Both theories can qualitatively explain the influence of the ionization conditions, such as laser fluence, the buffer gas pressure and declustering voltage on the matrix adduct formation. The new set of experiments differentiates between the two models, and the results strongly support the 'poisoning' model. (C) 2004 Elsevier B.V. All rights reserved.
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