| Autor: |
Maunoury, L., Manil, B., Rangama, J., Lebius, H., Huber, B. A., Pacquet, J. Y., Leroy, R., Pedersen, U. V., Hvelplund, P., Jensen, J., Tomita, S., Zettergren, H., Schmidt, H. T., Cederquist, H., Gustavo, F. |
| Předmět: |
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| Zdroj: |
Review of Scientific Instruments; May2005, Vol. 76 Issue 5, p053304, 8p |
| Abstrakt: |
The production of carbon cluster ions by injecting C60 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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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