Photodissociation with slice imaging technique

      Photodissociation dynamics of molecules plays a great role in the atmosphere photochemistry and the photodissociation studies are also very important in understanding the basic processes in the chemistry reaction. In our experiment the studied molecule intersects with the photolysis laser beam to absorb one or more photons to dissociate into fragments. The produced fragment is state-selectively ionized by the probe laser and projected onto the position sensitive detector by the ion optics. Then speed and angular distribution of the fragment are obtained by the velocity mapping and slice imaging technique. Briefly, velocity mapping means that the ionized fragments with the same velocity would be focused to the same point on the detector from the different initial position to get a high velocity resolution and slice imaging is the technique that will get the central slice of the Newton sphere. Based on the momentum and energy conservation, the measurement could provide the information on the translational and internal energy distribution for all produced fragments.

       Slice image of O+ ion produced from the multiphoton dissociation/ionization of O2 at ~225 nm.


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