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Imaging the [1+1] two-photon dissociation dynamics of Br2+ in a cold ion beam
陈旸
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陈旸 中国科学技术大学 yangchen@ustc.edu.cn 
摘要:
The [1+1] two-photon dissociation dynamics of 79Br2+ has been studied in a cold ion beam using a cryogenic cylindrical ion trap velocity map imaging spectrometer. The quartet 14Σu,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 – 5 eV energy region. Total kinetic energy release (TKER) and the two-dimensional 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 dissociation of Br2+ occurs in dissociative Ω = 3/2 states via ΔΩ = 0 parallel transitions from the 14Σu,3/2- intermediate state. Due to the considerable spin-orbit coupling effects in the excited states of Br2+, higher-lying dissociative quartet states are likely responsible for the observed photodissociation processes.
关键词:  Photodissociation dynamics, Br2+, velocity map imaging, ion trap
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Imaging the [1+1] two-photon dissociation dynamics of Br2+ in a cold ion beam
陈旸
Abstract:
The [1+1] two-photon dissociation dynamics of 79Br2+ has been studied in a cold ion beam using a cryogenic cylindrical ion trap velocity map imaging spectrometer. The quartet 14Σu,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 – 5 eV energy region. Total kinetic energy release (TKER) and the two-dimensional 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 dissociation of Br2+ occurs in dissociative Ω = 3/2 states via ΔΩ = 0 parallel transitions from the 14Σu,3/2- intermediate state. Due to the considerable spin-orbit coupling effects in the excited states of Br2+, higher-lying dissociative quartet states are likely responsible for the observed photodissociation processes.
Key words:  Photodissociation dynamics, Br2+, velocity map imaging, ion trap