| Title: |
Decay of C60 by delayed ionization and C2 emission: Experiment and statistical modeling of kinetic energy release. |
| Authors: |
Lebeault, M.-A., Baguenard, B., Concina, B., Calvo, F., Climen, B., Lépine, F., Bordas, C. |
| Source: |
Journal of Chemical Physics; 8/7/2012, Vol. 137 Issue 5, p054312, 9p, 1 Diagram, 1 Chart, 7 Graphs |
| Subject Terms: |
IONIZATION (Atomic physics), CHEMICAL kinetics, MATHEMATICAL models, FULLERENES, DISSOCIATION (Chemistry), FORCE & energy, FRAGMENTATION reactions |
| Abstract: |
C60 molecules highly excited in the nanosecond regime decay following ionization and dissociation by emitting a series of carbon dimers, as well as other small fragments if excitation is strong enough. The fragmentation mass spectrum and kinetic energy release of all charged fragments obtained in these experiments are interpreted within the framework of the Weisskopf theory, using a realistic Monte Carlo procedure in which the rates of all relevant decay channels are modeled using Arrhenius expressions. Comparison between the measurements and the simulated spectra allows the distribution of deposited energy to be accurately estimated. The dependence of the fragment kinetic energies on the laser fluence, found in the simulation but not observed in the experimental results, indicates that the small fragments are not necessarily emitted from small fullerenes resulting from C60 by sequential decay. Rather, direct multifragmentation of C60 is invoked to interpret the observed patterns. The possible role of post-ionization of neutral emitted fragments is discussed. [ABSTRACT FROM AUTHOR] |
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| Database: |
Complementary Index |
