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dc.contributor.author
Gutierres, L. I.  
dc.contributor.author
Lima, N.W.  
dc.contributor.author
Thomaz, R. S.  
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Papaléo, R. M.  
dc.contributor.author
Bringa, Eduardo Marcial  
dc.date.available
2018-09-14T17:56:52Z  
dc.date.issued
2017-03  
dc.identifier.citation
Gutierres, L. I.; Lima, N.W.; Thomaz, R. S.; Papaléo, R. M.; Bringa, Eduardo Marcial; Simulations of cratering and sputtering from an ion track in crystalline and amorphous Lennard Jones thin films; Elsevier; Computacional Materials Science; 129; 3-2017; 98-106  
dc.identifier.issn
0927-0256  
dc.identifier.uri
http://hdl.handle.net/11336/59712  
dc.description.abstract
Impacts of swift heavy ions of different energy loss in amorphous and crystalline Lennard-Jones (LJ) thin films (2–60 nm) were simulated using classical molecular dynamics to study cratering and sputtering in model molecular thin films. Crater size is determined mostly by evaporation and melt flow from the hot ion track, while rim size is determined both by melt flow and by coherent displacement of particles due to the large pressure developed in the excited region, with minor influence of particles from the substrate. Sputtering yields from both crystalline and amorphous samples are similar (including the scaling with energy loss), due to the extremely high temperature and disordered condition of the track region from where most ejected particles originate in the early stages of the track evolution. Cratering, however clearly depends on the crystallinity of the film. Craters and rims are much smaller in crystalline films mainly due to faster energy dissipation, higher stress threshold for plasticity and smaller free-volume in the ordered phase. We also found a large dependence of the induced surface effects on film thickness below a critical thickness value. The pressure pulse due to the ion impact is weaker and cooling of the excited track is more efficient in short tracks, both contributing to the decreased radiation damage efficiency on ultrathin layers. Despite the simplicity of the LJ model, the simulations in the amorphous films reproduce remarkably well several of the experimental features seen recently on polymer thin and ultrathin films irradiated by swift heavy ions.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Elsevier  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
Craters  
dc.subject
Molecular Dynamics Simulations  
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Polymers  
dc.subject
Swift Heavy Ions  
dc.subject.classification
Astronomía  
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Ciencias Físicas  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Simulations of cratering and sputtering from an ion track in crystalline and amorphous Lennard Jones thin films  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2018-09-12T14:00:26Z  
dc.journal.volume
129  
dc.journal.pagination
98-106  
dc.journal.pais
Países Bajos  
dc.journal.ciudad
Amsterdam  
dc.description.fil
Fil: Gutierres, L. I.. Pontificia Universidade Católica do Rio Grande do Sul; Brasil  
dc.description.fil
Fil: Lima, N.W.. Pontificia Universidade Católica do Rio Grande do Sul; Brasil  
dc.description.fil
Fil: Thomaz, R. S.. Pontificia Universidade Católica do Rio Grande do Sul; Brasil  
dc.description.fil
Fil: Papaléo, R. M.. Pontificia Universidade Católica do Rio Grande do Sul; Brasil  
dc.description.fil
Fil: Bringa, Eduardo Marcial. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Cuyo. Facultad de Ciencias Exactas y Naturales; Argentina  
dc.journal.title
Computacional Materials Science  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://dx.doi.org/10.1016/j.commatsci.2016.12.001  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0927025616306140