Abstract
Indium oxide cations of the form In n O m + are produced by laser vaporization in a pulsed nozzle source and detected with time of flight mass spectrometry. The In 2O + and In 3O + ions have high relative intensities in the mass spectra of clusters sampled directly from the source. Cluster cations are mass-selected and photodissociated using the third harmonic (355 nm) of a Nd:YAG laser. The elimination of indium cation is the dominant loss channel for all cluster cations. However, certain other clusters, i.e., In 2O +, In 2O 2, In 3O + and In 3O 2 + are produced as fragments from several cluster sizes and are thus identified as particularly stable. Density functional theory calculations are employed for selected species to determine their structures and relative stabilities. The Wade–Mingos electron counting rules are found to be inappropriate for these systems because their bonding is primarily ionic.
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