Journalartikel

Jahr der Veröffentlichung: 1995

Seiten: 81-93

Zeitschrift: European Journal of Mass Spectrometry

Bandnummer: 1

Heftnummer: 1

ISSN: 1356-1049

DOI Link: https://doi.org/10.1255/ejms.163

Verlag: SAGE Publications

Abstract: 
Molecular ejection and ionization processes in matrix assisted laser desorption/ionization (MALDI) mass spectrometry are described. Angular resolved initial velocity distributions of matrix and analyte ions, obtained both from MALDI samples prepared normally and from peptide-doped single crystals of dihydroxybenzoic acid, are presented as ion density plots, The ejection distributions have been found to be bimodal, consisting of a slow, less forward peaked fraction and a fast fraction, which is directed more towards the surface normal, The ion plots show a significant quenching of matrix ions in areas of high peptide ion density, This effect is interpreted as the result of ion-molecule reactions in the gas phase leading to proton transfer from matrix ions to analyte molecules and is described by a simple kinetic overlap model, Additional effects of solid phase absorption, electronic excitation life times and fluorescence yield are discussed.

Harvard-Zitierstil: Bökelmann, V., Spengler, B. and Kaufmann, R. (1995) Dynamical Parameters of Ion Ejection and Ion Formation in Matrix-Assisted Laser Desorption/Ionization, European Journal of Mass Spectrometry, 1(1), pp. 81-93. https://doi.org/10.1255/ejms.163

APA-Zitierstil: Bökelmann, V., Spengler, B., & Kaufmann, R. (1995). Dynamical Parameters of Ion Ejection and Ion Formation in Matrix-Assisted Laser Desorption/Ionization. European Journal of Mass Spectrometry. 1(1), 81-93. https://doi.org/10.1255/ejms.163