Ion beams of carbon clusters and multiply charged fullerenes produced with electron cyclotron resonance ion sources
- CIRIL, CEA-CNRS-ENSICAEN-Universite de Caen, BP 5133, F-14070 Caen Cedex 5 (France)
The production of carbon cluster ions by injecting C{sub 60} fullerene vapor into different electron cyclotron resonance (ECR) ion sources (MONO1001/2.45 GHz and CAPRICE/14 GHz) is described. The extracted ion mass spectra show a bimodal distribution, well known from collisions between electrons or ions and fullerenes. In addition to small carbon clusters and even-numbered fullerene ions, odd-numbered clusters with (n>30) are detected with low intensities. In particular, we have analyzed the mass spectra as a function of the rf power applied to the ECR plasma. Optimum power values are found for the production of individual carbon cluster ions, which increase with decreasing cluster size. Whereas at low power the production of fullerene ions dominates, the intensity of the very small carbon clusters is found to strongly increase with the injected power. This difference in the power dependence is used to vary and to determine the beam composition for ions with identical mass/charge ratios.
- OSTI ID:
- 20722196
- Journal Information:
- Review of Scientific Instruments, Vol. 76, Issue 5; Other Information: DOI: 10.1063/1.1900663; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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