Temporal development of sputtered atom distributions from Au(1 1 1) targets following bombardment with 100 keV/atom Au2 ions |
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| Affiliation: | 1. Department of Physics, California State University, P.O. Box 6866, Fullerton, CA 92834-6866, USA;2. Division of Physics, Mathematics and Astronomy, California Institute of Technology, Pasadena, CA 91125, USA;1. Hunan Key Laboratory of Two-Dimensional Materials, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China;2. Hunan Key Laboratory of Two-Dimensional Materials, Department of Applied Physics, School of Physics and Electronics, Hunan University, Changsha 410082, China;3. The State Key Laboratory for Mesoscopic Physics, Frontiers Science Centre for Nano Optoelectronics, School of Physics, Peking University, Beijing 100871, China;1. European Commission, Joint Research Centre (JRC), Petten, Netherlands;2. Hydrogenics;3. Clean Horizon, France;4. Centro Nacional Del Hidrógeno, Spain;5. IFE, Norway;6. AIST (Advanced Industrial Science and Technology), Japan;7. Engie, France;8. Groningen University, the Netherlands;9. Unitec Institute of Technology, New Zealand;10. ITM Power, UK;11. Université Catholique de Louvain, Division of Materials and Process Engineering, Belgium;12. Forschungszentrum Jülich GmbH, Institute of Electrochemical Process Engineering (IEK-3), Germany;13. CEA, Université Paris Saclay, France;1. Department of Energy and Technology, Swedish University of Agricultural Sciences, Uppsala, Sweden;2. Institute of Energy Technology, Eastern Switzerland University of Applied Sciences, Rapperswil, Switzerland;3. Bioenergy Systems Department, Deutsches Biomasseforschungszentrum Gemeinnützige GmbH, Leipzig, Germany;4. Biochemical Conversion Department, Deutsches Biomasseforschungszentrum Gemeinnützige GmbH, Leipzig, Germany;1. Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 101400, China;2. School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, China;3. State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150001, Heilongjiang Province, China;4. Georgia Institute of Technology, Atlanta, GA 30332-0245, United States |
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| Abstract: | Recently Bouneau et al. measured the angular and energy distributions of negative Aun (n=2–7) ions emitted from gold targets following bombardment with swift gold cluster projectiles. They found that the energy distributions could be fitted with a spike-like model, and that the angular distributions were independent of the azimuthal emission angle and relatively strongly forward directed. We have used MD simulations to investigate the temporal development of energy and angular distributions of sputtered atoms from Au(1 1 1) targets following bombardment with 100 keV/atom Au2 ions. Our results show that during the very early stages of the collision cascade the energy distribution of sputtered atoms is described well by the linear cascade model. Essentially all high energy sputtered atoms are emitted during this phase of the collision cascade. However, the energy distributions of atoms sputtered after 0.5 ps were typical of emission from a thermal spike and could be fitted well with a Sigmund–Claussen model. The polar angle distributions of sputtered atoms were strongly forward directed early in the collision cascade, but became less forward directed as the thermal spike developed. |
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