Ultrafast laser irradiation vs cluster ion impact: molecular-dynamics comparison of materials processes in highly energized solids

2008 ◽  
Author(s):  
Herbert M. Urbassek ◽  
Christian Anders ◽  
Luis Sandoval ◽  
Arun K. Upadhyay
Keyword(s):  
Molecular Dynamics ◽  
Laser Irradiation ◽  
Ultrafast Laser ◽  
Cluster Ion ◽  
Ion Impact

Molecular Dynamics Simulation of Fullerene Cluster Ion Impact

1997 ◽  
Vol 504 ◽  
Author(s):  
Takaaki Aoki ◽  
Toshio Seki ◽  
Masahiro Tanomura ◽  
Jiro Matsuo ◽  
Zinetulla Insepov ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Kinetic Energy ◽  
Carbon Cluster ◽  
Dynamics Simulation ◽  
Multiple Collision ◽  
Sapphire Substrates ◽  
Cluster Ion ◽  
Ion Impact ◽  
Dynamics Simulations ◽  
Cascade Damage

ABSTRACTIn order to interpret the projection range and to reveal the mechanism of damage formation by cluster ion impact, molecular dynamics simulations of a fullerene carbon cluster (C60) impacting on diamond (001) surfaces were performed. When the kinetic energy of C60 is as low as 200eV/atom, C60 implants into the substrate deeper than a monomer ion with the same energy per atom because of the clearing-way effect. The kinetic energy of the cluster disperses isotropically because of the multiple-collision effect, and then a large hemispherical damage region is formed. When the energy of the cluster is as high as 2keV/atom, the cluster dissociates in the substrate, and then cascade damage is formed like in a case of a monomer ion impact. The projection range of incident atoms becomes similar to that of the monomer with the same energy per atom. However, the number of displacements of C60 is larger than the summation of 60 monomer carbons. The displacement yield of fullerene is 4 to 7 times higher than that of monomer carbon. This result agrees with the measurement of the displacements made on sapphire substrates with C60 and C2 irradiation.

scholarly journals Cluster Evolution from Ultrafast Laser Irradiation of Gold Nanoparticle: A Molecular Dynamics Study

2020 ◽  
Vol 1428 ◽  
pp. 012004
Author(s):  
Riser Fahdiran ◽  
Iwan Sugihartono ◽  
Erfan Handoko ◽  
Setia Budi ◽  
Herbert M. Urbassek
Keyword(s):  
Molecular Dynamics ◽  
Laser Irradiation ◽  
Gold Nanoparticle ◽  
Ultrafast Laser ◽  
Cluster Evolution

Molecular dynamics study of monomer and dimer emission processes with high energy gas cluster ion impact

2007 ◽  
Vol 201 (19-20) ◽  
pp. 8427-8430 ◽  
Author(s):  
Takaaki Aoki ◽  
Toshio Seki ◽  
Satoshi Ninomiya ◽  
Jiro Matsuo
Keyword(s):  
Molecular Dynamics ◽  
High Energy ◽  
Cluster Ion ◽  
Ion Impact

Molecular Dynamics Investigation of Phase Change Induced by Ultrafast Laser Irradiation

2017 ◽  
Author(s):  
Pengfei Ji ◽  
Yiming Rong ◽  
Yuwen Zhang ◽  
Yong Tang
Keyword(s):  
Molecular Dynamics ◽  
Laser Pulse ◽  
Phase Change ◽  
Laser Irradiation ◽  
Ultrafast Laser ◽  
Atomic Scale ◽  
Dynamics Simulation ◽  
Time Step ◽  
Temporal And Spatial Distribution ◽  
Diffraction Profile

Irradiated by ultrafast laser pulse, the phase change phenomena in aluminum film are investigated via molecular dynamics simulation. The embedded-atom method potential is employed to describe atomic interactions. The laser heating is modeled by adding a kinetic energy term to the laser pulse irradiated atom at each time step. The resolidification is realized by thermal conduction to cool down locally melted atoms. The temporal and spatial distribution of atomic motion is recorded to compute the temperature evolution and structure change during melting and resolidification processes. The interface between solid and liquid is identified via Ackland analysis. Due to the temperature difference, diffraction profile of the resolidified aluminum is found different from the aluminum before laser irradiation. The simulation results provide helpful information on the atomic scale temperature variation and structure transformation underlying ultrafast laser induced phase change.

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