Endohedral fullerene-noble gas clusters formed with high-energy bimolecular reactions of C (x = 60, 70; n = 1, 2, 3)
✍ Scribed by Thomas Weiske; Jan Hrušák; Diethard K. Bohme; Helmut Schwarz
- Publisher
- John Wiley and Sons
- Year
- 1992
- Tongue
- German
- Weight
- 574 KB
- Volume
- 75
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Abstract
Results are reported for high‐energy beam experiments which establish the formation of endohedral carbon cluster‐noble gas compounds by bimolecular reactions of C (x = 60, 70; n = 1, 2, 3) with He and C with Ne. The ions were accelerated up to 8 ke V in a four‐sector mass spectrometer and allowed to collide with the noble gas in a collision chamber at room temperatur. Product ions were monitored with a B/E = constant linked scan. Within the sensivity of the experiments, no carbon cluster‐gas compounds were observed in the reactions of C with H~2~, D~2~, O~2~, Ar, and SF~6~, or of C with O~2~. The observed fall in the cross‐section for carbon cluster‐noble gas compounds with increasing size of the noble gas, the observation of unimolecular loss of C~2~ from mass‐selected C~x~He^+^ ions, and the elimination of carbon fragments instead of He observed in the formation of the collision‐induced C~x~He^n+^ product ions are taken as evidence for endohedral compound formation. Results of ab initio molecular‐orbital calculations for the perpendicular penetration of the plane of ionized benzene with He, Ne, and Ar indicate that sufficient kinetic energy should be available in the collisions with C to penetrate the C cage at the collision energies of the experiments.