Fluid dynamics calculation of sputtering from a cylindrical thermal spike

Jakas, Mario M.; Bringa, Eduardo M.; Johnson, R. E.

doi:10.1103/physrevb.65.165425

Cited by 69 publications

(65 citation statements)

References 18 publications

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“…Several theoretical models have been applied to the description of the amorphization caused by electronic excitation, such as thermal spike, 24,25 Coulomb explosion, 26 or molecular dynamics ͑MD͒ calculations. 27,28 So far, in spite of its simplicity, the thermal spike model has been mostly used to account for some relevant features of the amorphization process by single-ion impact. In this model the crystal does not develop any disorder ͑point defects͒ and keeps structurally unmodified unless the stopping power reaches a certain threshold value characteristic of the crystal.…”

Section: Introductionmentioning

confidence: 99%

Synergy between thermal spike and exciton decay mechanisms for ion damage and amorphization by electronic excitation

et al. 2006

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A theoretical model is proposed to account for the damage and amorphization induced in LiNbO 3 by ion bombardment in the electronic energy-loss regime. It relies on the synergy between the thermal spike generated by electron-phonon interaction and the nonradiative decay of localized ͑self-trapped͒ excitons. Calculations have been carried out to describe the effect of single impact as well as multiple impact ͑high fluence͒ irradiations. In the first case, the defect concentration profile and the radius of the amorphous tracks have been theoretically predicted and they are in good accordance with those experimentally determined. For high fluence irradiations ͑Ն10 13 cm −2 ͒ the model predicts the formation of homogeneous amorphous surface layers whose thickness increases with fluence. The propagation of the crystalline-amorphous boundary has been determined as a function of irradiation fluence. Theoretical predictions are also in good agreement with experimental data on Si-irradiated ͑7.5 and 5 MeV͒ LiNbO 3 outside the region of nuclear collision damage.

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Section: Introductionmentioning

confidence: 99%

Synergy between thermal spike and exciton decay mechanisms for ion damage and amorphization by electronic excitation

et al. 2006

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“…1b). The process is mesoscopic in nature and can be described by a hydrodynamic ow model [3,4]. In this stage of sputtering material removal is dominated by azimuthally isotropic ejection of single atoms and small clusters from the crater.…”

Section: Resultsmentioning

confidence: 99%

“…While impact of atomic and small cluster projectiles like Au 3 can be described by a concept of a linear collision cascade or thermal spike, processes taking place during impacts of larger clusters are more mesoscopic in nature. Consequently, they are better described by concepts adopted from hydrodynamics [3,4].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2013

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Large-scale molecular dynamics computer simulations are used to investigate the dynamics of material ejection during high-energy Arn cluster bombardment of Ag(111) at normal incidence. The silver sample containing 7 million atoms is bombarded with Arn 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 modications 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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“…40,41 For femtosecond-laser pulse irradiation, a variety of models have also been invoked. They generally involve 19 multiple ionization ͑or tunneling ionization͒ followed by melting, ablation, and redeposition.…”

Section: Physical Mechanismsmentioning

confidence: 99%

Femtosecond laser and swift-ion damage in lithium niobate: A comparative analysis

García-Navarro

Agulló‐López

Olivares

et al. 2008

Journal of Applied Physics

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A first principles study of the lattice stability of diamond-structure semiconductors under intense laser irradiation J. Appl. Phys. 113, 023301 (2013) High-order sideband generation in bulk GaAs Appl. Phys. Lett. 102, 012104 (2013) Defect mediated reversible ferromagnetism in Co and Mn doped zinc oxide epitaxial films J. Appl. Phys. 112, 113917 (2012) Time-domain sampling of x-ray pulses using an ultrafast sample response Appl. Phys. Lett. 101, 243106 (2012) The effects of vacuum ultraviolet radiation on low-k dielectric films App. Phys. Rev. 2012Rev. , 12 (2012 Additional information on J. Appl. Phys. Relevant damage features associated with femtosecond pulse laser and swift-ion irradiations on LiNbO 3 crystals are comparatively discussed. Experiments described in this paper include irradiations with repetitive femtosecond-laser pulses ͑800 nm, 130 fs͒ and irradiation with O, F, Si, and Cl ions at energies in the range of 0.2-1 MeV/amu where electronic stopping power is dominant. Data are semiquantitatively discussed by using a two-step phenomenological scheme. The first step corresponds to massive electronic excitation either by photons ͑primarily three-photon absorption͒ or ions ͑via ion-electron collisions͒ leading to a dense electron-hole plasma. The second step involves the relaxation of the stored excitation energy causing bond breaking and defect generation. It is described at a phenomenological level within a unified thermal spike scheme previously developed to account for damage by swift ions. A key common feature for the two irradiation sources is a well-defined intrinsic threshold in the deposited energy density U th required to initiate observable damage in a pristine crystal: U th Ϸ 1.3ϫ 10 4 −2ϫ 10 4 J / cm 3 for amorphization in the case of ions and U th Ϸ 7 ϫ 10 4 J / cm 3 for ablation in the case of laser pulses. The morphology of the heavily damaged regions ͑ion-induced tracks and laser-induced craters͒ generated above threshold and its evolution with the deposited energy are also comparatively discussed. The data show that damage in both types of experiments is cumulative and increases on successive irradiations. As a consequence, a certain incubation energy density has to be delivered either by the ions or laser photons in order to start observable damage under subthreshold conditions. The parallelism between the effects of laser pulses and ion impacts is well appreciated when they are described in terms of the ratio between the deposited energy density and the corresponding threshold value.

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Fluid dynamics calculation of sputtering from a cylindrical thermal spike

Cited by 69 publications

References 18 publications

Synergy between thermal spike and exciton decay mechanisms for ion damage and amorphization by electronic excitation

Synergy between thermal spike and exciton decay mechanisms for ion damage and amorphization by electronic excitation

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

Femtosecond laser and swift-ion damage in lithium niobate: A comparative analysis

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