Abstract
Stoichiometric and non-stoichiometric negatively charged CO2 cluster ions have been produced in a crossed neutral cluster/electron beam ion source. The abundance and stability of these ions have been studied with a double focussing sector field mass spectrometer. The observed abundance anomalies (“magic numbers”) in the mass spectra of (CO2) − n and (CO2) n O− ions correlate with corresponding small and large metastable fractions of these ions (for loss of one CO2 unit). Variation of the measured metastable fractions as a function ofn are related to corresponding changes in the monomer binding energies. In addition, we have observed for the first time (CO2) n O −2 ions (i.e. at electron energies above 8 eV with an energy resonance at about 14 eV) and we discuss possible production mechanisms for these ions. Relative electron attachment cross sections have been determined in the energy regime O<E≦20 eV for (CO2) − n , (CO2) n O− and (CO2) n O −2 withn=1 to 20. The shape of the cross section function for (CO2) n O− is strongly dependent on the cluster sizen.
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References
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It is interesting to note in this conjunction that Messmer et al. [3] have recently presented theoretical evidence for “bent bonds” in the CO2 molecule based on ab initio correlated wavefunction results. These results strongly suggest that the carbon-oxygen double bonds in the CO2 molecule are better represented in terms of a pair of bent bonds than by a combination of a σ-bond and a π bond
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