Vibrational Spectroscopy of Gas-Phase Metal-Carbide Clusters and Nanocrystals
Deniz van HeijnsbergenDepartment of Molecular and Laser Physics, University of Nijmegen, Toernooiveld 1, NL-6525 ED Nijmegen, The NetherlandsGert von HeldenDepartment of Molecular and Laser Physics, University of Nijmegen, Toernooiveld 1, NL-6525 ED Nijmegen, The NetherlandsMichael A. DuncanDepartment of Chemistry, University of Georgia, Athens, Georgia 30602André J. A. van RoijDepartment of Molecular and Laser Physics, University of Nijmegen, Toernooiveld 1, NL-6525 ED Nijmegen, The NetherlandsGerard MeijerDepartment of Molecular and Laser Physics, University of Nijmegen, Toernooiveld 1, NL-6525 ED Nijmegen, The Netherlands
1999en
ABI
Abstract
Neutral $\mathrm{Ti}{}_{8}\mathrm{C}{}_{12}$ and $\mathrm{Ti}{}_{14}\mathrm{C}{}_{13}$ clusters are produced in the gas phase with pulsed-nozzle laser vaporization. Infrared multiphoton excitation with a pulsed free-electron laser results in thermionic electron emission for these clusters, and the parent molecular ions are detected. Multiphoton ionization is strongly enhanced on vibrational resonances of these clusters, making it possible to observe infrared resonance-enhanced multiphoton ionization spectra. These spectra indicate C-C bonding for the ``met-cars'' while $\mathrm{Ti}{}_{14}\mathrm{C}{}_{13}$ has remarkable similarities to bulk TiC.
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