Metastable fragment-ion analysis in a reflectron instrument with a gridless ion mirror

Eur. J. Mass Spectrom. 2, 23–32 (1996)
DOI: 10.1255/ejms.76

Metastable fragment-ion analysis in a reflectron instrument with a gridless ion mirror

Jianru Stahl-Zeng and Franz Hillenkamp
Institute for Medical Physics and Biophysics, Robert-Koch-Straße 31, D-48149 Münster, Unversity of Münster, Germany.
Michael Karas
Instrumentelle Analyt. Chemie, Theodor-Stern-Kai 7, D-60590 Frankfurt/M, University of Frankfurt/M, Germany.

ABSTRACT:

Using post source decay technique, matrix-assisted laser desorption ionization mass spectrometry (MALDI-MS) is not only a method to determine the molecular weight but also a useful tool to get structural information of biomacromolecular compounds. The way to optimize a gridless reflectron for post source decay analysis is demonstrated. A window-independent mass calibration function for fragment ions is described. Delayed ion extraction to improve the resolution of precursor ion selection is also be presented.

Keywords: post source decay analysis, reflectron, calibration,resolution

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