Letter: Characteristics of photoelectrons emitted in matrix-assisted laser desorption/ionization Fourier transform ion cyclotron resonance experiments

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Eur. J. Mass Spectrom. 8, 67 - 69 (2002)

Letter: Characteristics of photoelectrons emitted in matrix-assisted laser desorption/ionization Fourier transform ion cyclotron resonance experiments

Michael V. Gorshkov
Institute of Energy Problems of Chemical Physics, Russian Academy of Sciences, Moscow 117829, Russia
Vladimir E. Frankevich and Renato Zenobi^*
Department of Chemistry, Swiss Federal Institute of Technology, ETH Hönggerberg, CH-8093 Zurich, Switzerland

ABSTRACT:

We show a simple method to study the characteristics of electrons emitted from the metal target in matrix-assisted laser desorption/ionization (MALDI) experiments. The method is based on measurements of SF₆ ion appearance curves by introducing SF₆ as a buffer gas into the vacuum chamber during laser desorption. We obtained the energy distribution of emitted electrons, as well as information on their origin and on ion formation mechanisms in MALDI experiments.

Keywords: matrix-assisted laser desorption ionization (MALDI), Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry, electron energy distribution

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