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The nucleation and growth of particles of various metals on amorphous carbon was investigated by in situ TEM techniques. Particles of Pd, Ni and Ag, in contrast to Au, Pt, Rh and Ir, were found to nucleate at unusually low number densities, and only with considerable delay, but exhibited high growth speeds thereafter, as well as growth transients upon interruptions of the vapour beam. During experiments...
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