We study the photodissociation dynamics of nitrous oxide using the time-sliced ion veloc- ity imaging technique at three photolysis wavelengths of 134.20, 135.30, and 136.43 nm. The O（^1Sj=0）＋N2（XI∑g＋） product ...We study the photodissociation dynamics of nitrous oxide using the time-sliced ion veloc- ity imaging technique at three photolysis wavelengths of 134.20, 135.30, and 136.43 nm. The O（^1Sj=0）＋N2（XI∑g＋） product channels were investigated by measuring images of the O（iSj=0） products. Vibrational states of N2（XI∑g＋） products were fully resolved in the images. Product total kinetic energy releases （TKER） and the branching ratios of vibrational states of N2 products were determined. It is found that the most populated vibrational states of N2 products are v--2 and v--3. The angular anisotropy parameters （8 values） were also derived. The β values are very close to 2 at low vibrational states of the correlated N2 （X1 ∑g＋） products at all three photolysis wavelengths, and gradually decrease to about 1.4 at v--7. This indicates the dissociation is mainly through a parallel transition state to form products at lower vibrational states, and the highly vibrational exited products are from a more bent configuration. This is consistent with the observed shift of the most intense rotational structure in the TKER as the vibrational quantum number increases.展开更多
基金This work was supported by the National Natural Science Foundation of China （No.21403207 and No.21473173）, the China Postdoctoral Science Foundation （No.2014M551810 and No.2015TS0659）, and the University of Science and Technology of China. We thank Jia-yue Yang, Tian-gang Yang and Wei-qing Zhang for stimulated discussions.
文摘We study the photodissociation dynamics of nitrous oxide using the time-sliced ion veloc- ity imaging technique at three photolysis wavelengths of 134.20, 135.30, and 136.43 nm. The O（^1Sj=0）＋N2（XI∑g＋） product channels were investigated by measuring images of the O（iSj=0） products. Vibrational states of N2（XI∑g＋） products were fully resolved in the images. Product total kinetic energy releases （TKER） and the branching ratios of vibrational states of N2 products were determined. It is found that the most populated vibrational states of N2 products are v--2 and v--3. The angular anisotropy parameters （8 values） were also derived. The β values are very close to 2 at low vibrational states of the correlated N2 （X1 ∑g＋） products at all three photolysis wavelengths, and gradually decrease to about 1.4 at v--7. This indicates the dissociation is mainly through a parallel transition state to form products at lower vibrational states, and the highly vibrational exited products are from a more bent configuration. This is consistent with the observed shift of the most intense rotational structure in the TKER as the vibrational quantum number increases.
