Schematics of the laser desorption/ionization TOF setup used for production. A laser was applied for the first set of measurements and was replaced in the second experiment by a Nd:YAG laser. Only the linear mode of the MALDI-TOF system was used. The total length of the system is about 2 m and the operating pressure during the experiments was below .
TOF spectrum for negative ions in the mass range 180–260 u. The target was pure osmium powder. The inset shows the mass region were ions are observed. The energy of the laser pulse for this measurement was .
TOF spectra of and ions for different energies of the laser pulse.
Intensity of negative osmium ions per shot as a function of the energy of the laser pulse. The saturation observed at high energies of the laser pulse comes mainly from saturation in the MCP detector.
Percentage of negative osmium and osmium oxide ions for different energies of the Nd:YAG laser. The numbers correspond to energies of the laser pulse for which no saturation was observed. The sum is the total number of negative osmium and osmium oxides ions detected (100%).
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