Successive neutral C
2 losses from multiply-charged fullerene ions, C
60z+ and C
70z+ (
z=1~4), have been examined using gas-phase fast particle bombardment (FPB) technique with He, Ar, and isobutane beams. Quadruply-charged ions, C
604+ and (C
60-C
2n)
4+ (
n = 1~5), were detected by optimizing the experimental conditions. Smallest fragments originated from C
2 losses from C
60+·, C
602+, C
603+, and C
604+ ions were C
36+·, C
422+, C
443+, and C
504+, respectively. The extents of C
2 losses from C
60z+ and C
70z+ (
z= 1~4) ions have been compared with each other, using gas-phase FPB and collision-induced dissociation techniques. Metastable peaks originated from C
2 and/or C
4 losses from C
602+ ion were detected. On the basis of the results obtained, kinetics and energetics of C
2 losses from C
60 ions have been discussed, and the internal energy of C
60+· ion produced under gas-phase FPB conditions was roughly estimated.
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