Electronically Excited OH Super-rotors from Water Photodissociation by Using Vacuum Ultraviolet Free-Electron Laser Pulses

Chang，Yao1; An，Feng2; Li，Qinming1,3; Luo，Zijie1,4; Che，Li4; Yang，Jiayue1; Chen，Zhichao1; Zhang，Weiqing1; Wu，Guorong1; Hu，Xixi2; Xie，Daiqian2; Yuan，Kaijun1,3; Yang，Xueming1,5

2020-09-17

10.1021/acs.jpclett.0c02320

Journal of Physical Chemistry Letters   影响因子和分区

1948-7185

1948-7185

The fragmentation dynamics of water in a superexcited state play an important role in the ionosphere of the planets and in the photodissociation region (PDR) of the planetary nebula. In this Letter, we experimentally study the fragmentation dynamics of H2O with the energy above its ionization potential initiated by vacuum ultraviolet free-electron laser pulses. The experimental results indicate that the binary fragmentation channels H + OH and the triple channels O + 2H both present at 96.4 nm photolysis. Electronically excited OH super-rotors (v = 0, N ≥ 36, or v = 1, N ≥ 34), with the internal energy just above the OH (A) dissociation energy, are observed for the first time, which are only supported by the large centrifugal barriers. An absolute cross section of these super-rotors is estimated to be 0.7(±0.3) × 10-18 cm2. The tunnelling rates of these extremely rotationally excited states are also analyzed. This work shows a spectacular example of energy transfer from a photon to fragment rotation through photodissociation.

SCI ; EI

英语

NI论文

其他

National Natural Science Foundation of China (NSFC)[21922306][21873099][21673232] ; Chinese Academy of Sciences[XDB17000000][121421KYSB20170012] ; Chemical Dynamics Research Center[21688102] ; Key Technology Team of the Chinese Academy of Sciences[GJJSTD20190002] ; NSFC[21733006][21590802]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Atomic, Molecular & Chemical

WOS:000574906500022

AMER CHEMICAL SOC

20204309380062

Electrons ; Energy transfer ; Photolysis ; Ionization potential ; Ionosphere

Atmospheric Properties:443.1 ; Physical Chemistry:801.4 ; Chemical Reactions:802.2 ; Atomic and Molecular Physics:931.3

2-s2.0-85091191195

Scopus

1.State Key Laboratory of Molecular Reaction Dynamics,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian,457 Zhongshan Road,116023,China
2.Key Laboratory of Mesoscopic Chemistry,School of Chemistry and Chemical Engineering,Institute of Theoretical and Computational Chemistry,Nanjing University,Nanjing,210093,China
3.University of Chinese Academy of Sciences,100049,China
4.Department of Physics,School of Science,Dalian Maritime University,Dalian,1 Linghai Road,116026,China
5.Department of Chemistry,Southern University of Science and Technology,Shenzhen,518055,China

Chang，Yao,An，Feng,Li，Qinming,et al. Electronically Excited OH Super-rotors from Water Photodissociation by Using Vacuum Ultraviolet Free-Electron Laser Pulses[J]. Journal of Physical Chemistry Letters,2020,11(18):7617-7623.

Chang，Yao.,An，Feng.,Li，Qinming.,Luo，Zijie.,Che，Li.,...&Yang，Xueming.(2020).Electronically Excited OH Super-rotors from Water Photodissociation by Using Vacuum Ultraviolet Free-Electron Laser Pulses.Journal of Physical Chemistry Letters,11(18),7617-7623.

Chang，Yao,et al."Electronically Excited OH Super-rotors from Water Photodissociation by Using Vacuum Ultraviolet Free-Electron Laser Pulses".Journal of Physical Chemistry Letters 11.18(2020):7617-7623.