Reactions of transition metals with acetonitrile clusters in the gas phase are studied using laser ablation-molecule beam technique. Differently sized cluster ions for different transition metals are observed in reflection time-of-flight mass spectrum. Reactivities of Ti~+, V~+, Cr~+ are stronger than those of Cu~+, Fe~+. It should be mentioned that the M~+ (CHCN)_2 (M~+ = Ti~+, V~+, Cr~+) cluster ions have larger intensity than the others.

Key words: LASER, SPUTTERING, MOLECULAR BEAM, TIME-OFF FLIGHT MASS SPECTROMETRY, ACETONITRILE