Dynamics of the Penning Ionization of Fullerene Molecules by Metastable Neon Atoms

The collisional energy dependence of the cross section for the Penning ionization of C60 mols. by metastable neon atoms was measured in the 0.035-0.5 eV range in a crossed beam expt. The results show a decreasing trend (.apprx.20%) in the low-energy range up to 0.06 eV, with a slightly increasing dependence in the higher energy range. This behavior is interpreted in terms of the characteristics of the intermol. interaction: an electron transfer can be possible from the metastable rare gas atom to the C60 mol. with the formation of an ion-pair collision complex. At low collisional energy the system evolves mainly adiabatically and the ionization occurs mainly from the ion-pair complex. However, at higher collision energies, nonadiabatic transitions become possible and the systems can remain partially \"trapped\" within the higher adiabatic state with a consequent increase of the ionization probability. [on SciFinder (R)]

Published in:
Journal of Physical Chemistry A, 104, 25, 5942-5945

 Record created 2006-02-27, last modified 2018-03-17

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