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The microscopic formation mechanism of O + H2 products from photodissociation of H2O

Yubang Li, Xixi Hu*, Daiqian Xie*



In conclusion, a set of high-accuracy global coupled PESs of X ̃ and B ̃ state of H2O has been improved by adding more ab initio points in O+H2 channel to the previous calculation data reported by Jiang et al. and fitting all points by the PIP-NN method. The structural, energetic, and spectroscopic properties of PESs are in a good agreement with experimental measurement. The quantum dynamical calculations were implemented by using a Chebyshev real wave packet method. The total cross section is consistent with the latest experimental measurements. The branching ratio of hydrogen generation is very small, and the product H2 mainly distributes at the vibrational ground state with only X ̃ and B ̃ states considered. While diverting the initial wave packet from the Frank-Condon region to B ̃-D ̃ conical intersection, the calculated branching ratio of the H2 generation channel increases obviously, which indicates the important role of the higher D ̃ state on the dynamics for the O+H2 channel. It should be pointed out that a more accurate dynamical characterization of the X ̃-B ̃-D ̃ three-state model, as well as more experimental work, will be helpful to better understand the produce of O(1D)+H2(X ̃1~Σg+ ) from water photodissociation at different wavelengths.
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