Affiliation:
1. Physics Department, University of New Hampshire, Durham, NH 03824, USA
Abstract
Fullerenes in the gas phase, excited by a pulsed laser, exhibit thermionic emission. We analyze the time dependence of the ion yield of C n + in a mass spectrometer. By pulsing the extraction field of the ion lens, we are able to observe delayed ions formed as late as 50 µs after excitation by the 2nd, 3rd or 4th harmonic of a Q-switched YAG laser. The enhanced sensitivity of this new technique allows us to detect delayed ions not only from excited C 60 and C 70, but from all other even-sized clusters in the size range 36≤ n ≤70. Our results do not confirm the assertion that thermionic emission from C 60 and C 70 can be characterized by just 2 or 3 distinct rate constants.
Publisher
World Scientific Pub Co Pte Lt
Subject
Condensed Matter Physics,Statistical and Nonlinear Physics
Cited by
14 articles.
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