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Expert cause and effect analysis of the failure of historical structures taking into account factors that are difficult to measure

100%

Śladowski G., Paruch R., Śladowski G., Paruch R.

Archives of Civil Engineering

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2017

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issue 2

2

Sputtering of Benzene Sample by Large Ne, Ar and Kr Clusters - Molecular Dynamics Computer Simulations

72%

Rzeznik L., Paruch R., Garrison B., Postawa Z.

Acta Physica Polonica A

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2013

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vol. 123

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issue 5

825-827

EN

Molecular dynamics simulations are employed to probe the role of an impact angle on emission efficiency of organic molecules sputtered from benzene crystal bombarded by 15 keV Ne_{2953}, Ar_{2953}, and Kr_{2953} clusters. It is found that both the cluster type and the angle of incidence have significant effect on the emission efficiency. The shape of the impact angle dependence does not resemble the dependence characteristic for medium size clusters (C_{60}, Ar_{366}), where sputtering yield only moderately increases with the impact angle, has a shallow maximum around 40° and then decreases. On the contrary, for the large projectiles (Ne_{2953}, Ar_{2953}, and Kr_{2953}) the emission efficiency steeply increases with the impact angle, has a pronounced maximum around 55° followed by rapid signal decay. It has been found that the sputtering yield is the most sensitive to the impact angle change for Kr cluster projectiles, while change of the impact angle of Ne projectile has the smallest effect on the efficiency of material ejection.

3

Molecular Dynamics Simulations of Energetic Ar Cluster Bombardment of Ag(111)

72%

Palka G., Rzeznik L., Paruch R., Postawa Z.

Acta Physica Polonica A

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2013

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vol. 123

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issue 5

831-833

EN

Large-scale molecular dynamics computer simulations are used to investigate the dynamics of material ejection during high-energy Ar_n cluster bombardment of Ag(111) at normal incidence. The silver sample containing 7 million atoms is bombarded with Ar_n projectiles (n=45-30000) with kinetic energy spanning from a few keV up to 1 MeV. Such a wide range of projectile parameters allows probing processes taking place during low-density collision cascade as well as during high-density events characteristic of micrometeorite bombardment in space. The material modifications and total sputtering yield of ejected particles are investigated. While at low-energy impacts, ejection of individual silver atoms is the main emission channel, the ejection of large clusters from the corona of the created crater dominates for the high-energy impacts.

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1 Śladowski G.

Expert cause and effect analysis of the failure of historical structures taking into account factors that are difficult to measure

Sputtering of Benzene Sample by Large Ne, Ar and Kr Clusters - Molecular Dynamics Computer Simulations

Molecular Dynamics Simulations of Energetic Ar Cluster Bombardment of Ag(111)