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

Andreas Lassesson (Institutionen för experimentell fysik) ; Andrei Gromov ; Kirsten Mehlig ; A. Taninaka ; H. Shinohara ; Eleanor E B Campbell
Journal of Chemical Physics (0021-9606). Vol. 119 (2003), 11, p. 5591-5600.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: ENDOHEDRAL FULLERENES; ELECTRONIC-STRUCTURE; MASS-SPECTROMETRY; C-60; CLUSTERS; CARBON; METALLOFULLERENES; IONIZATION; DISSOCIATION; ENERGIES



Denna post skapades 2014-02-06.
CPL Pubid: 193516

 

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Institutioner (Chalmers)

Institutionen för experimentell fysik (1900-2005)
Institutionen för fysik (GU) (GU)

Ämnesområden

Atom- och molekylfysik och optik

Chalmers infrastruktur