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Formation of small lanthanum-carbide ions from laser induced fragmentation of La@C-82

Journal article
Authors Andreas Lassesson
Andrei Gromov
Kirsten Mehlig
A. Taninaka
H. Shinohara
Eleanor E B Campbell
Published in Journal of Chemical Physics
Volume 119
Issue 11
Pages 5591-5600
ISSN 0021-9606
Publication year 2003
Published at Department of Physics (GU)
Pages 5591-5600
Language en
Links dx.doi.org/10.1063/1.1599833
Keywords ENDOHEDRAL FULLERENES; ELECTRONIC-STRUCTURE; MASS-SPECTROMETRY; C-60; CLUSTERS; CARBON; METALLOFULLERENES; IONIZATION; DISSOCIATION; ENERGIES
Subject categories Atom and Molecular Physics and Optics

Abstract

The fragmentation behavior of the endohedral metallofullerene La@C-82 was studied using gas phase time-of-flight mass spectrometry. The results were compared with the fragmentation of C-60. When the metallofullerene was excited by a 337 nm ns laser, small lanthanum-carbide fragments LaCn+, n=0-6, were detected. A simple statistical maximum entropy model was used to simulate the excitation energy dependence of the loss of the LaCn+ molecules as well as C-2 evaporation to form smaller metallofullerenes. By comparing experimental ion intensities with the model, the appearance energies of LaCn+, n=0-6, were found to lie above 65 eV. The lanthanum-carbide fragments ejected from La@C-82 decrease in size with increasing internal energy. The ejection of La+ and LaC2+ is preferred at the expense of larger fragments such as LaC4+ and metallofullerenes at the higher excitation. (C) 2003 American Institute of Physics.

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