Abstract

Abstract The intensities of secondary emission of TipCn+ (p = 1 to 5) and TiCn− ions show a saw-toothed behaviour when p = 1 or 3 according to the parity of the number n of carbon atoms. Maxima occur for even n if p = 1, for odd n if p = 3. In the case p = 1, the phenomenon can be understood from a CNDO calculation carried out in the simple case of linear chains TiCn(n ⩽ 10): we find then a greater stability of the clusters with even n. So, this result very well agrees with the rule of correspondence between a large secondary emission of given species of ions and their great stability.

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