Photodissociation Dynamics of H2O via the (E)over-tilde ' (B-1(2)) Electronic State
Photodissociation Dynamics of H2O via the (E)over-tilde ' (B-1(2)) Electronic State
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DOI：
10.1021/acs.jpca.1c01459
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发表时间：
2021
影响因子：
2.9
通讯作者：
Yuan Kaijun
中科院分区：
文献类型：
--
作者：
Luo Zijie;Chang Yao;Zhao Yarui;Yang Jiayue;Chen Zhichao;Cheng Yi;Che Li;Wu Guorong;Yang Xueming;Yuan Kaijun
Photodissociation dynamics of H2O via theẼ′1B2state were studied using the high-resolution H atom photofragment translational spectroscopy method, in combination with the tunable vacuum ultraviolet free electron laser (VUV FEL). The measured translational energy spectra allow us to determine the respective quantum state population distributions for the nascent OH(X2Π) and OH(A2Σ+) photofragments. Analyses of the quantum state population distributions show both the ground and electronically excited OH fragments to be formed with moderate vibrational excitation but with highly rotational excitation. Unlike the dissociation via the lower-lying electronic states, where OH(X) is the major fragment, the OH(A) products are predominant via theẼ′ state. These products are mainly ascribed to a fast dissociation on theB̃1A1state surface after nonadiabatic transitions from the initial excitedẼ′ state to theB̃state. Meanwhile, another dissociation pathway from theẼ′ state to the1B23pb2state, followed by coupling to the1A23pb2state, is also observed, which yields the OH(X) + H and O(3P) + 2H products.
