Fragmentation of Na_3~(+) clusters by He impact: effect of initial cluster temperature on non-adiabatic phenomena

摘要

A theoretical study has been carried out of the fragmentation of Na_3~(+) ions following a collision with He. The collision leaves Na_3~(3) in any of three electronic states, and each of these can fragment into three product channels (Na_2~(+) + Na, Na_2 + Na~(+) and Na + Na + Na~(+)). The Na_3~(+) system has a conical intersection and an avoided crossing; these permit transitions between the different states. Cross-sections for each of the nine fragmentation pathways are presented for three different values of the initial vibrational excitation of Na_3~(+). The cross-sections are very sensitive to this vibrational energy.