Abstract
Strong-field ionization and concomitant Coulomb explosion studies are performed on small (<30 atoms) homogeneous transition metal clusters composed of niobium or tantalum. Enhanced ionization of the clusters results in the formation of charge states reaching M11+ [M=Nb, Ta] under irradiation with 100fs pulses of 624nm light at intensities of approximately 1PW/cm2. The same maximum charge states were created upon expansion of the pulse width to 350fs with consistent pulse energy. These results are compared to previous studies involving metal oxide and carbide clusters of similar size, yielding identical ion states. This suggests that the enhanced ionization behavior of metal-containing clusters is driven by the delocalized electrons on the metal species.
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