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Experiments are conducted to investigate the role of the avoided crossingseam in the photodissociation of H$_3^+$. Three-dimensional imaging ofdissociation products is used to determine the kinetic energy release andbranching ratio among the fragmentation channels. Vibrational distributions aremeasured by dissociative charge transfer of H$_2^+$ products. It is found thatthe photodissociation of hot H$_3^+$ in the near ultraviolet produces coldH$_2^+$, but hot H$_2$. Modelling the wavepacket dynamics along the repulsivepotential energy surface accounts for the repopulation of the ground potentialenergy surface. The role of the avoided crossing seam is emphasized and itsimportance for the astrophysically relevant charge transfer reactions isunderlined.

philosophical transactions - royal society. mathematical, physical and engineering sciences/philosophical transactions - royal society. mathematical, physical and engineering sciences

Photodissociation as a probe of the H$_3^+$ avoided crossing seam