Ammonia Chemisorption on Gallium Arsenide Clusters
RICE UNIV HOUSTON TX DEPT OF CHEMISTRY
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Gallium arsenide clusters in the 6-16 atom size range were generated by laser vaporization in a supersonic nozzle and trapped as positive ions in Fourier transform ion-cyclotron resonance mass spectrometer. Measurements of the rate of attachment of ammonia revealed that all clusters larger than seven atoms were most reactive near the 11 composition ratio of galliumarsenic. The results suggest that even at this small size the clusters begin to adopt the alternating galliumarsenic bonding arrangement characteristic of bulk GaAs crystal surfaces where gallium-arsenic bonding activates gallium atoms for ammonia chemisorption. Keywords Surface chemistry Ammonia chemisorption Gallium arsenide clusters Reprints.
- Physical Chemistry