Abstract
Formation of potassium cyanide clusters in the direct laser vaporization of K 3[Fe(CN) 6] was studied by use of a TOF mass spectrometer. It was found that the positive cluster ions are due to [K(KCN) n ] +, n = 0–37, in which magic numbers are n = 4, 13, 22, 37, whereas the negative cluster ions were assigned to [(KCN) n CN] −, n = 0–13, where magic numbers are n = 4, 13. These magic numbers are identical with those of alkali-halide clusters. This indicates that they have the structures 1 × 3 × 3 ( n = 4), 3 × 3 × 3 ( n = 13), 3 × 3 × 5 ( n = 22), 3 × 5 × 5 ( n = 37) as those of alkali-halide clusters. Thus the formation process of potassium cyanide clusters should go along the growth course of the rock salt structure.
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