Energy dependent mechanistic switching in the dissociation of the CO 2 dication Patrick Robertson , Dr David Heathcote, Prof Claire Vallance University of Oxford, UK Electron driven chemistry in the Earth's upper atmosphere and interstellar medium is a rich source of high energy atomic and molecular ions. These ions, if formed with sufficient kinetic energy, may escape their local environment and act as a source for the formation of more complex molecules. 1 In this work, we use multi-mass velocity-map imaging and covariance analysis to reveal the dissociation dynamics of the carbon dioxide (CO 2 ) dication the follow an electron-molecule collision (between 50-100 eV electron kinetic energy). The primary mechanism for the formation of C + and O + ions from the CO 2 2+ parent ion is revealed to switch between 75 and 100 eV. This mechanistic insight has not been noted in previous photoionisation 2 and high energy charge partical collision 3 studies of CO 2 . and represents a potential new source of high energy atomic ions from a simple and environmentally significant molecule. References
1. Smita et al., Communications Chemistry, 2022, 5, 1 2. Masuoka, Phys. Rev. A., 1994, 50, 5, 3886-3894 3. Yuan et al.,J. Phys. Chem. Lett.2022, 13, 32, 7594–7599
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