Formation of small lanthanum-carbide ions from laser induced fragmentation of La@C-82
Artikel i vetenskaplig tidskrift, 2003

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.

CARBON

ENERGIES

CLUSTERS

IONIZATION

MASS-SPECTROMETRY

ENDOHEDRAL FULLERENES

DISSOCIATION

METALLOFULLERENES

ELECTRONIC-STRUCTURE

C-60

Författare

Andreas Lassesson

Chalmers, Institutionen för experimentell fysik

Andrei Gromov

Göteborgs universitet

Kirsten Mehlig

Göteborgs universitet

A. Taninaka

Nagoya University

H. Shinohara

Nagoya University

Eleanor E B Campbell

Göteborgs universitet

Journal of Chemical Physics

0021-9606 (ISSN) 1089-7690 (eISSN)

Vol. 119 5591-5600

Ämneskategorier

Atom- och molekylfysik och optik

DOI

10.1063/1.1599833