Spontaneous Desorption time-of-flight Mass Spectrometry (SDMS): Time correlated emission of electrons and negative ions in a constant electric field |
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Authors: | Serge Della Negra Yvon Le Beyec Per Håkansson |
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Affiliation: | Institut de Physique Nucléaire, B.P. No. 1, 91406 Orsay, France;Tandem Accelerator Laboratory, Uppsala, Sweden |
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Abstract: | A very simple time of flight mass spectrometer has been used to measure mass spectra for the negative ions of organic compounds in the mass range up to 3000 u. Desorbed ions were obtained by applying a constant negative voltage to a flat metallic surface, coated with a few micrograms of organic material. We show that electrons and negative ions are emitted simultaneously from the same point on the surface. Mass spectra obtained by this technique are compared to mass spectra for the same compounds, obtained with 252Cf fission fragment ionization. |
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