| Numéro |
J. Phys. Colloques
Volume 50, Numéro C8, Novembre 1989
36th International Field Emission Symposium
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|---|---|---|
| Page(s) | C8-159 - C8-162 | |
| DOI | https://doi.org/10.1051/jphyscol:1989828 | |
36th International Field Emission Symposium
J. Phys. Colloques 50 (1989) C8-159-C8-162
DOI: 10.1051/jphyscol:1989828
Institut für Physikalische Chemie, Universität Bonn, Wegelerstrasse 12, D-5300 Bonn 1, F.R.G.
J. Phys. Colloques 50 (1989) C8-159-C8-162
DOI: 10.1051/jphyscol:1989828
ENHANCED FORMATION OF MULTIPLY CHARGED IONS IN NEGATIVE ION FIELD DESORPTION MASS SPECTROMETRY OF ORGANIC COMPOUNDS
E. BRAMER-WEGER, S. THIEBES et F.W. RÖLLGENInstitut für Physikalische Chemie, Universität Bonn, Wegelerstrasse 12, D-5300 Bonn 1, F.R.G.
Abstract
Enhanced formation of doubly and triply charged negative ions has been obtained in negative ion field desorption mass spectrometry (NFD MS) of acids and salts by applying a matrix mixture of polyvinyl pyrrolidone (PVP) and polyethylene glycol (PEG). Abundant doubly charged ions of disaccharides could be obtained from a mixture with a quaternary ammonium salt and sodium chloride. The matrix properties leading to the formation of multiply charged ions are discussed.