(n= 2)have been accelerated to 1-4 MeV in the 3×2MV tandem pelletron of FudanUniversity (NEC 9SDH2). Intensities of the MeV cluster beams ranging from 0.1 to100nA depend on the type of cluster ions and the number of atom it contains. The lowenergy negative cluster ions injected were obtained from a cesium sputter source(SNICS II). The mass analysis of the high energy cluster beams was performed by aswitching magnet. The mass spectrum of the carbon cluster beam produced in thecollisions of C
8
-
cluster ions with stripping gas molecules N
2
indicates that there isan odd-even effect related to the carbon cluster styucture.