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Photodissociation dynamics of HN3 and DN3 at 157 nm
Kaijun Yuan1, Yuan Cheng, Fengyan Wang
1State key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China.
Abstract:
Photodissociation dynamics of HN 3 at 157.6 nm have been studied using the H-atom Rydberg tagging time-of-flight technique. Product translational energy distributions and angular distributions have been measured. From these distributions, three H-atom channels are observed. The vibrational structure in the fast-H channel could be assigned to a progression in the N 3 symmetric stretching mode (nu 100), together with a progression of the symmetric stretching mode with one quantum of bending motion (nu 110). The broad translational energy distribution of the slow-H channel is energetically consistent with the cyclic-N 3 formation process or a triple product dissociation channel. Photodissociation of DN 3 was also investigated using the same technique. Isotope effect on the product translational energy distribution has been observed, in which the slow H-atom is clearly more pronounced.
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