Tracing intermolecular Coulombic decay of carbon-dioxide dimers and oxygen dimers after valence photoionization
| Autor: | Iskandar, W, Gatton, AS, Gaire, B, Sturm, FP, Larsen, KA, Champenois, EG, Shivaram, N, Moradmand, A, Williams, JB, Berry, B, Severt, T, Ben-Itzhak, I, Metz, D, Sann, H, Weller, M, Schoeffler, M, Jahnke, T, Dörner, R, Slaughter, D, Weber, T |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Iskandar, W; Gatton, AS; Gaire, B; Sturm, FP; Larsen, KA; Champenois, EG; et al.(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. Lawrence Berkeley National Laboratory: Retrieved from: http://www.escholarship.org/uc/item/4qr9n9j8 Physical Review A, vol 99, iss 4 |
| DOI: | 10.1103/physreva.99.043414. |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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