Imaging the [1+1] two-photon dissociation dynamics of Br2+ in a cold ion beam
| Autor: | Yang Chen, Yun-xiao Zhao, Zefeng Hua, Hao Liang, Dongfeng Zhao, Zhengfang Zhou, Shaowen Feng |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Ion beam Photodissociation 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Kinetic energy 01 natural sciences Dissociation (chemistry) Spectral line 0104 chemical sciences Ion Excited state Intermediate state Physical and Theoretical Chemistry Atomic physics 0210 nano-technology |
| Zdroj: | Chinese Journal of Chemical Physics. 32:531-535 |
| ISSN: | 2327-2244 1674-0068 |
| Popis: | The [1+1] two-photon dissociation dynamics of mass-selected $^{79}$ Br $_2$ $^+$ has been studied in a cold ion beam using a cryogenic cylindrical ion trap velocity map imaging spectrometer. The quartet 1 $^4\Sigma_{{\rm{u}}, 3/2}^-$ state of $^{79}$ Br $_2$ $^+$ 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 two-dimensional recoiling velocity distributions of fragmented $^{79}$ Br $^+$ 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 $^{79}$ Br $_2$ $^+$ occurs in dissociative $\Omega$ =3/2 state via $\Delta\Omega$ =0 parallel transition from the 1 $^4\Sigma_{{\rm{u}}, 3/2}^-$ intermediate state. Due to the considerable spin-orbit coupling effects in the excited states of $^{79}$ Br $_2$ $^+$ , higher-lying dissociative quartet states are likely responsible for the observed photodissociation processes. |
| Databáze: | OpenAIRE |
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