Investigations into the fragmentation and ionization of highly excited La@C[sub 82]

Lassesson, A.; Mehlig, K.; Gromov, A.; Taninaka, A.; Shinohara, H.; Campbell, E. E. B.
December 2002
Journal of Chemical Physics;12/1/2002, Vol. 117 Issue 21, p9811
Academic Journal
We report the first measurements of delayed ionization of the metallofullerene La@C[sub 82]. When highly excited in laser desorption, La@C[sub 82] was found to ionize over several microseconds. The rate of delayed ionization of La@C[sub 82] was compared to C[sub 60] under the same extraction conditions, and found to be significantly different. A theoretical model was used for the fitting of the ion signal of the two fullerenes. The metallofullerene results can be fitted well over a time window <30 µs and are consistent with a low ionization potential (6.3 eV) and a high radiative cooling rate. The C[sub 60] data cannot be fitted over the same time window, indicative of an additional time-dependent competing decay channel.


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