Enhancing reactivity of SiO$^+$ ions by controlled excitation to extreme rotational states
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2022
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| _version_ | 1866912183474978816 |
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| author | Venkataramanababu, Sruthi Li, Anyang Antonov, Ivan Dragan, James Stollenwerk, Patrick R. Guo, Hua Odom, Brian C. |
| author_facet | Venkataramanababu, Sruthi Li, Anyang Antonov, Ivan Dragan, James Stollenwerk, Patrick R. Guo, Hua Odom, Brian C. |
| contents | Optical pumping of molecules provides unique opportunities for control of chemical reactions at a wide range of rotational energies. This work reports a chemical reaction with extreme rotational excitation of a reactant and its kinetic characterization. We investigate the chemical reactivity for the hydrogen abstraction reaction SiO$^+$ + H$_2$ $\rightarrow$ SiOH$^+$ + H in an ion trap. The SiO$^+$ cations are prepared in a narrow rotational state distribution, including super-rotor states with rotational quantum number $\it{(j)}$ as high as 170, using a broad-band optical pumping method. We show that the super-rotor states of SiO$^+$ substantially enhance the reaction rate, a trend reproduced by complementary theoretical studies. We reveal the mechanism for the rotational enhancement of the reactivity to be a strong coupling of the SiO$^+$ rotational mode with the reaction coordinate at the transition state on the dominant dynamical pathway. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2209_09129 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Enhancing reactivity of SiO$^+$ ions by controlled excitation to extreme rotational states Venkataramanababu, Sruthi Li, Anyang Antonov, Ivan Dragan, James Stollenwerk, Patrick R. Guo, Hua Odom, Brian C. Atomic Physics Chemical Physics Optical pumping of molecules provides unique opportunities for control of chemical reactions at a wide range of rotational energies. This work reports a chemical reaction with extreme rotational excitation of a reactant and its kinetic characterization. We investigate the chemical reactivity for the hydrogen abstraction reaction SiO$^+$ + H$_2$ $\rightarrow$ SiOH$^+$ + H in an ion trap. The SiO$^+$ cations are prepared in a narrow rotational state distribution, including super-rotor states with rotational quantum number $\it{(j)}$ as high as 170, using a broad-band optical pumping method. We show that the super-rotor states of SiO$^+$ substantially enhance the reaction rate, a trend reproduced by complementary theoretical studies. We reveal the mechanism for the rotational enhancement of the reactivity to be a strong coupling of the SiO$^+$ rotational mode with the reaction coordinate at the transition state on the dominant dynamical pathway. |
| title | Enhancing reactivity of SiO$^+$ ions by controlled excitation to extreme rotational states |
| topic | Atomic Physics Chemical Physics |
| url | https://arxiv.org/abs/2209.09129 |