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    Relativistic Molecular Dynamics Simulations of Laser Ablation Process on the Xenon Solid

    Source: Journal of Heat Transfer:;2009:;volume( 131 ):;issue: 003::page 33112
    Author:
    Yun-Che Wang
    ,
    Lun-De Liao
    ,
    Hong-Chang Lin
    ,
    Jing-Wen Chen
    ,
    Chi-Chuan Hwang
    DOI: 10.1115/1.3056607
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The phenomena of Coulomb explosion require the consideration of special relativity due to the involvement of high energy electrons or ions. It is known that laser ablation processes at high laser intensities may lead to the Coulomb explosion, and their released energy is in the regime of kEV to MeV. In contrast to conventional molecular dynamics (MD) simulations, we adopt the three-dimensional relativistic molecular dynamics (RMD) method to consider the effects of special relativity in the conventional MD simulation for charged particles in strong electromagnetic fields. Furthermore, we develop a Coulomb force scheme, combined with the Lennard-Jones potential, to calculate interactions between charged particles, and adopt a Verlet list scheme to compute the interactions between each particle. The energy transfer from the laser pulses to the solid surface is not directly simulated. Instead, we directly assign ion charges to the surface atoms that are illuminated by the laser. By introducing the Coulomb potential into the Lennard-Jones potential, we are able to mimic the laser energy being dumped into the xenon (Xe) solid, and track the motion of each Xe atom. In other words, the laser intensity is simulated by using the repulsive forces from the Coulomb potential. Both nonrelativistic and relativistic simulations are performed, and the RMD method provides more realistic results, in particular, when high-intensity laser is used. In addition, it is found that the damage depth does not increase with repeated laser ablation when the pulse frequency is comparable to the duration of the pulse. Furthermore, we report the time evolution of energy propagation in space in the laser ablation process. The temporal-spatial distribution of energy indirectly indicates the temperature evolution on the surface of the Xe solid under intense laser illumination.
    keyword(s): Atoms , Lasers , Laser ablation , Molecular dynamics simulation , Particulate matter AND Coulombs ,
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      Relativistic Molecular Dynamics Simulations of Laser Ablation Process on the Xenon Solid

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    http://yetl.yabesh.ir/yetl1/handle/yetl/141113
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    contributor authorYun-Che Wang
    contributor authorLun-De Liao
    contributor authorHong-Chang Lin
    contributor authorJing-Wen Chen
    contributor authorChi-Chuan Hwang
    date accessioned2017-05-09T00:33:55Z
    date available2017-05-09T00:33:55Z
    date copyrightMarch, 2009
    date issued2009
    identifier issn0022-1481
    identifier otherJHTRAO-27857#033112_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/141113
    description abstractThe phenomena of Coulomb explosion require the consideration of special relativity due to the involvement of high energy electrons or ions. It is known that laser ablation processes at high laser intensities may lead to the Coulomb explosion, and their released energy is in the regime of kEV to MeV. In contrast to conventional molecular dynamics (MD) simulations, we adopt the three-dimensional relativistic molecular dynamics (RMD) method to consider the effects of special relativity in the conventional MD simulation for charged particles in strong electromagnetic fields. Furthermore, we develop a Coulomb force scheme, combined with the Lennard-Jones potential, to calculate interactions between charged particles, and adopt a Verlet list scheme to compute the interactions between each particle. The energy transfer from the laser pulses to the solid surface is not directly simulated. Instead, we directly assign ion charges to the surface atoms that are illuminated by the laser. By introducing the Coulomb potential into the Lennard-Jones potential, we are able to mimic the laser energy being dumped into the xenon (Xe) solid, and track the motion of each Xe atom. In other words, the laser intensity is simulated by using the repulsive forces from the Coulomb potential. Both nonrelativistic and relativistic simulations are performed, and the RMD method provides more realistic results, in particular, when high-intensity laser is used. In addition, it is found that the damage depth does not increase with repeated laser ablation when the pulse frequency is comparable to the duration of the pulse. Furthermore, we report the time evolution of energy propagation in space in the laser ablation process. The temporal-spatial distribution of energy indirectly indicates the temperature evolution on the surface of the Xe solid under intense laser illumination.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleRelativistic Molecular Dynamics Simulations of Laser Ablation Process on the Xenon Solid
    typeJournal Paper
    journal volume131
    journal issue3
    journal titleJournal of Heat Transfer
    identifier doi10.1115/1.3056607
    journal fristpage33112
    identifier eissn1528-8943
    keywordsAtoms
    keywordsLasers
    keywordsLaser ablation
    keywordsMolecular dynamics simulation
    keywordsParticulate matter AND Coulombs
    treeJournal of Heat Transfer:;2009:;volume( 131 ):;issue: 003
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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