Two-photon photodissociation dynamics study of CS2: The S(1S) atom channel
Abstract
Two-photon photodissociation dynamics of carbon disulfide (CS2) were studied by means of the sliced velocity map ion imaging technique. The S(1S) + CS(X1Σ+) channel was directly observed from the measured images of S(1S) products in the wavelength range of 290.10–336.88 nm. The translational energy distributions and angular distributions of fragments have been derived. Rovibrational states of the CS(X1Σ+) co-products were partially resolved in the translational energy spectra and can be populated up to the energy limit of the available energy. Experimental results also show that the product anisotropy parameters are β2 > 0 and β4 ∼ 0. The latter indicates that the intermediate state reached by the first one photon excitation has a quite long lifetime, while the former suggests the molecules undergo a parallel transition from the intermediate state to the final state upon the second photon excitation and then experience a fast dissociation process. Combined with previous studies, we propose a possible dissociation mechanism: after absorbing two photons in the range of 290.10–336.88 nm, the CS2 molecule may undergo a sequential transition 1A1(1Σg+) ← 11B2(1Δu)/1A2(1Δu) ← X1Σg+, then directly dissociate or couple to other electronic states and dissociate.
Article Details
Journal Info
The Journal of Chemical Physics
American Institute of Physics
Authors (10)
Shuaikang Yang
Department of Chemical Physics, School of Chemistry and Materials Science, University of Science and Technology of China 1 , Hefei, Anhui 230026,
Zhiguo Zhang
Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering
Yongxin Dong
State Key Laboratory of Chemical Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics, Chinese Academy of Sciences 2 , Dalian, Liaoning 116023,
Zijie Luo
State Key Laboratory of Chemical Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics, Chinese Academy of Sciences 2 , Dalian, Liaoning 116023,
Wei Hua
Zhenxing Li
State Key Laboratory of Heavy Oil Processing, College of New Energy and Materials
Quan Shuai
State Key Laboratory of Chemical Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics, Chinese Academy of Sciences 2 , Dalian, Liaoning 116023,
Xingan Wang
State Key Laboratory of Chemical Reaction Dynamics and Department of Chemical Physics, University of Science and Technology of China 1 , Hefei 230026,
Kaijun Yuan
State Key Laboratory of Chemical Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics, Chinese Academy of Sciences 2 , Dalian, Liaoning 116023,
Xueming Yang
State Key Laboratory of Chemical Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics