Imaging the [1+1] Two-Photon Dissociation Dynamics of Br2+ in a Cold Ion Beam |
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Authors: | Hao Liang Zheng-fang Zhou Ze-feng Hua Yun-xiao Zhao Shao-wen Feng Yang Chen Dong-feng Zhao |
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Affiliation: | Hefei National Laboratory for Physical Sciences at the Microscale, and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China |
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Abstract: | The [1+1] two-photon dissociation dynamics of mass-selected 79Br2+ has been studied in acold ion beam using a cryogenic cylindrical ion trap velocity map imaging spectrometer. The quartet 14Σ-u,3/2 state of 79Br2+ is employed as an intermediate state to initiate resonance enhanced two-photon excitation to high-lying dissociative states in the 4.0-5.0 eV energy region above the ground rovibronic state. Total kinetic energy release (TKER) and the twodimensional recoiling velocity distributions of fragmented 79Br+ ions are measured using the technique of DC-slice velocity map imaging. Branching ratios for individual state-resolved product channels are determined from the TKER spectra. The measured photofragment angular distributions indicate that the dissociation of 79Br2+ occurs in dissociative Ω=3/2 state via ΔΩ=0 parallel transition from the 14Σ-u,3/2 intermediate state. Due to the considerable spin-orbit coupling effects in the excited states of 79Br2+, higher-lying dissociative quartet states are likely responsible for the observed photodissociation processes. |
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Keywords: | Photodissociation dynamics Br2+ Velocity map imaging Ion trap |
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