Coupled molecular dynamics-Monte Carlo model to study the role of chemical processes during laser ablation of polymeric materials

Prasad, Mahesh; Conforti, Patrick F.; Garrison, Barbara J.

doi:10.1063/1.2754681

Cited by 23 publications

(27 citation statements)

References 109 publications

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“…This limited ability to consider bond breaks does allow us in the simulations to monitor if the conditions are right for chemical reactions to occur. A more complex approach for considering wide‐spread chemical reactions in laser ablation studies has been developed (Yingling, Conforti, & Garrison, 2004; Prasad, Conforti, & Garrison, 2007) but will not be discussed here.…”

Section: Molecular Dynamics Techniquementioning

confidence: 99%

Computational view of surface based organic mass spectrometry

Garrison

Postawa

2008

Mass Spectrometry Reviews

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147

204

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Surface based mass spectrometric approaches fill an important niche in the mass analysis portfolio of tools. The particular niche depends on both the underlying physics and chemistry of molecule ejection as well as experimental characteristics. In this article, we use molecular dynamics computer simulations to elucidate the fundamental processes giving rise to ejection of organic molecules in atomic and cluster secondary ion mass spectrometry (SIMS), massive cluster impact (MCI) mass spectrometry, and matrix‐assisted laser desorption ionization (MALDI) mass spectrometry. This review is aimed at graduate students and experimental researchers. © 2008 Wiley Periodicals, Inc., Mass Spec Rev 27: 289–315, 2008

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Section: Molecular Dynamics Techniquementioning

confidence: 99%

Computational view of surface based organic mass spectrometry

Garrison

Postawa

2008

Mass Spectrometry Reviews

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147

204

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“…Debris is generated as either a solid or as a melt which later solidifies either during transit or after coming to rest. Both of these are generated by different mechanisms that work together simultaneously [1][2][3][4][5][6][7][8][9]. However, it is generally accepted that the motive force for these species, once separated from the substrate, is the ablation-generated vapour plume and its associated shockwave [10,11].…”

Section: Introductionmentioning

confidence: 99%

Use of thin laminar liquid flows above ablation area for control of ejected material during excimer machining

Dowding¹,

Lawrence²

2008

International Congress on Applications of Lasers &Amp; Electro-Optics

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To observe excimer laser machining through thin liquid films and the effects thereof on debris control, equipment was designed to contain a small control volume that can be supplied with a laminar thin film of de-ionized (DI) water to flow over the workpiece. Using the same equipment, comparison with non-liquid ablation was possible. Reliable calculations of the debris size and density with respect to the distance from the centre of the shot, as well as the identification of modal trends in the dispersion of the debris were obtained from analysis of microscope images with graphical analysis software. The results suggest that the positional debris deposition of samples machined in ambient air show a modal tendency that is reliant on the machined feature shape and is a function of species size. This is proposed to be due to the interaction of multiple shockwaves at the extent of ablation plumes generated at geometryspecific locations in the feature. Debris is deposited where the shockwaves collide. Large debris did not typically travel much further than the boundary of the machined feature, whereas intermediate debris was found in radial streaks at a normal to the circular feature's perimeter. Laminar flows of liquid have shown potential to modify the end position and typical size of the debris produced, as well as increased homogeneity of deposition density. The use of immersion has reduced typical range by 17 per cent, and the deposition within the boundary of the ablation plume has a comparatively even population density with respect to the sample machined in ambient air. Outside the ablation plume extents, evidence of positional control of deposited debris species by laminar flow DI water immersion is shown by debris deposition in rippled flow line patterns for both circular and square features, indicating the action of transport by fluid flow. A typical increase in debris size by an order of magnitude when using DI water as an immersing liquid has been measured, a result that is in line with a colloidal interaction response.

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Section: Introductionmentioning

confidence: 99%

Use of thin laminar liquid flows above ablation area for control of ejected material during excimer machining

Dowding

Lawrence

2009

Proceedings of the Institution of Mechanical Engineers, Part B:

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To observe excimer laser machining through thin liquid films and the effects thereof on debris control, equipment was designed to contain a small control volume that can be supplied with a laminar thin film of DI water to flow over the workpiece. Using the same equipment, comparison with non-liquid ablation was possible. Reliable calculations of the debris size and density with respect to the distance from the centre of the shot, as well as the identification of modal trends in the dispersion of the debris were obtained from analysis of microscope images with graphical analysis software. The results suggest that the positional debris deposition of samples machined in ambient air show modal tendency reliant on the feature shape machined and according to species size. This is proposed to be due to the interaction of multiple shockwaves at the extent of ablation plumes generated at geometry specific locations in the feature. Debris is deposited where the shockwaves collide. Large debris did not typically travel much further than the boundary of the machined feature, whereas intermediate debris was found in radial streaks at a normal to the circular feature’s perimeter. Laminar flows of liquid have shown potential to modify the end position and typical size of the debris produced, as well as increased homogeneity of deposition density. The use of immersion has reduced typical range by 17%, and the deposition within the boundary of the ablation plume has a comparatively even population density with respect to the sample machined in ambient air. Outside the ablation plume extents, evidence of positional control of deposited debris species by laminar flow DI water immersion is shown by debris deposition in rippled flow line patterns for both circular and square features, indicating the action of transport by fluid flow. A typical increase in debris size by an order of magnitude when using DI water as an immersing liquid has been measured, a result that is in line with a colloidal interaction response

show abstract

Coupled molecular dynamics-Monte Carlo model to study the role of chemical processes during laser ablation of polymeric materials

Cited by 23 publications

References 109 publications

Computational view of surface based organic mass spectrometry

Computational view of surface based organic mass spectrometry

Use of thin laminar liquid flows above ablation area for control of ejected material during excimer machining

Use of thin laminar liquid flows above ablation area for control of ejected material during excimer machining

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