摘要：

Recent developments in laser and molecular beam technology have now made it possible to produce supersonic beams of virtually any element in the periodic table. Using laser vaporization of the appropriate target, the beam source conditions may be adjusted to produce either the cold free atoms alone, or clusters of these atoms with each other or with another element. Initial studies of these clusters have entailed the one- and two-photon laser ionization with time-of-flight mass selective detection. Using a variety of fixed frequency laser, the work function of copper clusters has been examined as a function of cluster size in the range from 2 to 29 atoms per cluster. Considerable detailed information has also been obtained for the electronic structure and bond lengths of a number of transition metal dimers and trimers (including Cu/sub 2/, Cr/sub 2/, V/sub 2/, Mo/sub 2/, and Cu/sub 3/) through the use of high resolution laser spectroscopy with mass-selective photoionization detection. 41 references, 5 figures.

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