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Investigations into the fragmentation and ionization of highly excited La@C-82

Journal article
Authors Andreas Lassesson
Kirsten Mehlig
Andrei Gromov
A. Taninaka
H. Shinohara
Eleanor E B Campbell
Published in Journal of Chemical Physics
Volume 117
Issue 21
Pages 9811-9817
ISSN 0021-9606
Publication year 2002
Published at Department of Physics (GU)
Pages 9811-9817
Language en
Links dx.doi.org/10.1063/1.1513465
Keywords ENDOHEDRAL FULLERENES; THERMIONIC EMISSION; DELAYED IONIZATION; BINDING-ENERGY; C-60; PHOTOFRAGMENTATION; MECHANISM; CARBON; ATOM
Subject categories Physical Sciences, Atom and Molecular Physics and Optics

Abstract

We report the first measurements of delayed ionization of the metallofullerene La@C-82. When highly excited in laser desorption, La@C-82 was found to ionize over several microseconds. The rate of delayed ionization of La@C-82 was compared to C-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 mus and are consistent with a low ionization potential (6.3 eV) and a high radiative cooling rate. The C-60 data cannot be fitted over the same time window, indicative of an additional time-dependent competing decay channel. (C) 2002 American Institute of Physics.

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