Recent progress and interest in optical microscopy has stimu-
lated studies of single metal particles. In these experiments, particles are not
only isolated from one another (i.e., they do not interact), but separated by
distances so large, that at most one particle is present in any given laser spot
in the sample (the spot, typically a few hundreds of nanometers in diame-
ter, is empty most of the time). Just as in the case of molecules [22, 23] or
semiconductor nanocrystals [24], investigations of single metal particles add
novel insight to conventional ensemble measurements, by exploiting the fol-
lowing advantages:
Recent progress and interest in optical microscopy has stimu- lated studies of single metal particles. In these experiments, particles are not only isolated from one another (i.e., they do not interact), but separated by distances so large, that at most one particle is present in any given laser spot in the sample (the spot, typically a few hundreds of nanometers in diame- ter, is empty most of the time). Just as in the case of molecules [22, 23] or semiconductor nanocrystals [24], investigations of single metal particles add novel insight to conventional ensemble measurements, by exploiting the fol- lowing advantages:
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