Photoionization/fragmentation of endohedral fullerenes |
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Authors: | S Suzuki Y Kojima H Shiromaru Y Achiba T Wakabayashi R Tellgmann EEB Campbell IV Herte |
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Institution: | 1. Department of Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo, 192-03, Japan 2. Division of Chemistry, Graduate School of Science, Kyoto University, Kyoto, 606-01, Japan 3. Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Postfach 1107, D-12474, Berlin, Germany 4. Fachbereich Physik, Freie Universit?t Berlin, Arnimallee 14, D-14195, Berlin, Germany
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Abstract: | Photoionizationlfragmentation of endohedral fullerenes was investigated by use of laser-de sorption time-offlight (LD-TOF) mass spectroscopy. The velocity distribution of the parent ion (LaC 82 + ) was found to be bimodal, as has previously been shown for laser desorbed C 60 + . The 0 fragment ions have velocity distributions corresponding predominantly to the fast parent ion distribution. The LD-TOF mass spectra taken with a relatively low laser fluence were independent of the delay time of the extraction pulse, showing only a monotonically decreasing pattern of LaC 2n + (as n decreased). However, with higher laser fluence, it was shown that the mass distributions drastically changed from the monotonically decreasing pattern to that of C 2n + and LaC 2n + with magic numbers. Based on these findings, a plausible photoionization/fragmentation mechanism is presented and discussed. |
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