Bonn 2000 – scientific programme

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A: Atomphysik

A 19: Fullerene (gemeinsam mit dem FV Molekülphysik)

A 19.9: Talk

Thursday, April 6, 2000, 16:00–16:15, HS VIII

Stability and structure of odd-numbered,multiply-charged carbon clusters — •Rajendra Parajuli, Paul Scheier, Verena Grill, Sara Matt, and Tilmann Märk — Inst. f. Ionenphysik, Leopold-Franzens Universität, Technikerstr. 25, A-6020 Innsbruck

Much work has been devoted over the last decade concerning the production, stability and structure of fullerene ions. Electron impact ionization of C−60 leads to a bimodial fragmentation pattern, with mostly even-numberd fullerene ions predominantly formed via successive C−2 evaporations. Some time ago [1] at least small amounts of multiply-charged species could be detected above n=32 and it was speculated that these odd-numbered ions may differ in structure from the fullerene-like even numbered ions.

In order to clarify this interesting question we have studied here quantitatevely the metastable decay of odd-numbered, multiply-charged C−41 ions with a two sector field mass spectrometer. We have found that these odd-numberd carbon cluster ions are less stable than their even-numbered counterparts and show a completely different decay behaviour.

[1] P.Scheier,B.Dünser,T.D.Märk, J.Phys.Chem., 99(1995)15428

Work supported by FWF and BMWV, Wien, Austria