Enhancing reactivity of SiO+ ions by controlled excitation to extreme rotational states

Sruthi Venkataramanababu, Anyang Li (), Ivan O. Antonov, James B. Dragan, Patrick R. Stollenwerk, Hua Guo and Brian C. Odom ()
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Sruthi Venkataramanababu: Northwestern University
Anyang Li: Northwest University
Ivan O. Antonov: Lebedev Physical Institute
James B. Dragan: Northwestern University
Patrick R. Stollenwerk: Argonne National Laboratory
Hua Guo: University of New Mexico
Brian C. Odom: Northwestern University

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: 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.

Date: 2023
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DOI: 10.1038/s41467-023-40135-x

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