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Creators/Authors contains: "Li, Anyang"

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  1. ; ; ; ; ; ; (, Nature Communications)
    Abstract 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++ H2 → 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 (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. 
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