Abstract
Abstract Fluorescence in the 200—600 nm range from excited fragments produced by collision of He(23S) with SnCl4 and Sn(CH3)4 has been studied in the relative collision energy of 135—210 meV. Emission cross sections for Sn I atomic resonance lines from SnCl4 slightly decrease with increasing collision energy. This originates from the fact that the effective potential between He(23S) and SnCl4 is slightly attractive. The branching ratio of Sn I states observed from SnCl4 is consistent with a simple dissociation model assuming equipartition of the available energy. These results are compatible with the harpoon mechanism as an initial step for formation of Sn I from SnCl4. On the other hand, the effective potential between He(23S) and Sn(CH3)4 is found to be repulsive, and the branching ratio of Sn I is increased to much more than that estimated from the statistical model. Excited Sn I states seem to be produced directly from Sn(CH3)4 by an excitation transfer mechanism via superexcited states, which mainly decay by Penning ionization.
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