Abstract
An overview of our latest findings on the photoionization of metallocarbohedrene clusters (Met-Cars) is presented. The ionization potentials (IPs) of titanium and zirconium Met-Cars of the stoichiometry Ti8−x Zr x C12 (x=0–4, 8) were determined by studying their photoionization efficiency spectra near threshold. It was found that the IPs are about 4 eV and decrease smoothly as the Ti/Zr ratio decreases. Comparison of the determined IPs with those predicted by theoretical calculations by other groups suggests that the geometry of the Met-Cars is that of the tetrahedral cage structure with T d symmetry, assuming a high degree of accuracy in the IP calculations. In another experiment, we investigated the mechanism of the delayed ionization of both single- and binary-metal Met-Cars. Using a reflectron time-of-flight mass spectrometer with a modified Wiley–McLaren double acceleration region, we measured ionization rates arising from the electron emission of Met-Cars composed of various transition metals under different photoionization conditions, which led to the conclusion that a thermionic emission mechanism dominantly contributes to the delayed ionization.
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Sakurai, H., Kooi, S.E. & Castleman, A.W. Latest Findings on the Photoionization of Met-Cars. Journal of Cluster Science 10, 493–507 (1999). https://doi.org/10.1023/A:1021900923797
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DOI: https://doi.org/10.1023/A:1021900923797