Tracing intermolecular Coulombic decay of carbon-dioxide dimers and oxygen dimers after valence photoionization
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Authors
Iskandar, W.
Gatton, A. S.
Gaire, B.
Sturm, F. P.
Larsen, K. A.
Champenois, E. G.
Shivaram, N.
Moradmand, A.
Williams, J. B.
Berry, B.
Issue Date
2019
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Article
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Abstract
We have conducted an experimental study on the photo double ionization (PDI) of carbon-dioxide dimers at photon energies of 37 and 55 eV and oxygen dimers at photon energies of 38, 41.5, and 46 eV, while focusing on the dissociation dynamics upon single-photon absorption. The investigation was performed by applying the cold-target recoil-ion momentum spectroscopy method in order to collect and record the three-dimensional momenta of the ionic fragments and emitted electrons from the dissociating dimer in coincidence. The kinetic-energy release upon fragmentation and the electron angular distributions in the laboratory and body-fixed frames, as well as the relative electron-electron emission angle, show unambiguous experimental evidence of intermolecular Coulombic decay (ICD) in carbon-dioxide dimers upon photoionization below and above the double-ionization threshold of CO2 monomers. The PDI of oxygen dimers is less conclusive and shows contributions from ICD and knock-off ionization mechanisms. As for atomic dimers, the present results reveal that ICD in CO2 dimers after valence PDI can also serve as a source for low-energy electrons, known to be very relevant in biological systems, cells, and tissues.
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Iskandar, W., Gatton, A. S., Gaire, B., Sturm, F. P., Larsen, K. A., Champenois, E. G., … Weber, T. (2019). Tracing intermolecular Coulombic decay of carbon-dioxide dimers and oxygen dimers after valence photoionization. Physical Review A, 99(4). doi:10.1103/physreva.99.043414
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In Copyright (All Rights Reserved)
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2469-9926