Abstract

The dehydrogenation of NH 3 by Ti, Zr, and Nb cations, produced in a laser-induced plasma reactor, is found to form both neutral and cationic clusters. Depending on the conditions, either the production of neutral metal nitride clusters is favored or, the formation of cationic `precursor' metal nitride clusters containing additional intact NH 3 is observed. The neutral clusters are formed when full dehydrogenation of the NH 3 is achieved, while the cationic precursor species are formed under conditions where a large fraction of the NH 3 remains intact. Metastable dissociation studies show that intact NH 3 molecules are bound to the developing transition metal nitride clusters.

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