Journal ArticleDOI
Molecular dynamics simulation study of the fluence dependence of particle yield and plume composition in laser desorption and ablation of organic solids
TLDR
In this article, two distinct regimes of molecular ejection separated by a well-defined threshold fluence are observed in molecular dynamics simulation of pulsed laser irradiation of an organic solid.Abstract:
Two distinct regimes of molecular ejection separated by a well-defined threshold fluence are observed in molecular dynamics simulation of pulsed laser irradiation of an organic solid. At fluences above the threshold a collective multilayer ejection or ablation occurs where large liquid droplets are ejected and the total yield of the ablated material follows a critical volume density of the deposited energy. Below threshold thermal desorption from the surface is observed and the desorption yield has an Arrhenius-type dependence on the laser fluence. The yield of monomers does not have a step increase at the threshold and thus deceptively does not give a straightforward interpretation of the ejection mechanisms.read more
Citations
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Journal ArticleDOI
Mechanisms of pulsed laser ablation of biological tissues.
Alfred Vogel,Vasan Venugopalan +1 more
TL;DR: It was found that the structure and morphology also affect the energy transport among tissue constituents and therefore the ablation efficiency of biological tissues is increased.
Journal ArticleDOI
Laser ablation in liquids : Applications in the synthesis of nanocrystals
TL;DR: In this article, the authors present a survey on the recent progress in laser ablation of a solid target in a confining liquid for the synthesis of nanocrystals with focus on the mechanism of the nanocrystal growth.
Journal ArticleDOI
MALDI Ionization: The Role of In-Plume Processes
Journal ArticleDOI
Microscopic mechanisms of laser ablation of organic solids in the thermal and stress confinement irradiation regimes
TL;DR: In this paper, large-scale molecular dynamics simulations demonstrate that the mechanisms responsible for material ejection as well as most of the parameters of the ejection process have a strong dependence on the rate of the laser energy deposition.
Journal ArticleDOI
Chemical and spectroscopic aspects of polymer ablation: Special features and novel directions
TL;DR: The first reports of laser ablation of polymers were issued almost simultaneously by Kawamura et al. as discussed by the authors and R. Srinivasan et al., who coined the terms ablative photodecomposition, now in common use.
References
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Journal ArticleDOI
Influence of the laser intensity and spot size on the desorption of molecules and ions in matrix-assisted laser desorption/ionization with a uniform beam profile
TL;DR: In this article, the dependence of the number of desorbed particles on laser fluence has been investigated for matrix-assisted laser desorption/ionization of analyte and matrix ions as well as for (photoionized) neutral matrix molecules using a homogeneous “flat-top” laser profile.
Journal ArticleDOI
Velocity distributions of intact high mass polypeptide molecule ions produced by matrix assisted laser desorption
Ronald C. Beavis,Brian T. Chait +1 more
TL;DR: In this article, the velocity distributions of polypeptide molecule ions (molecular mass 1000 − 15600 u) produced by matrix assisted ultraviolet laser desorption were measured using a modified time-of-flight mass spectrometer.
Journal ArticleDOI
Comments on explosive mechanisms of laser sputtering
Roger Kelly,Antonio Miotello +1 more
TL;DR: In this article, it was shown that the surface conditions chosen by Dabby and Paek are wrong and that the subsurface region is indeed hotter but only by a few degrees.
Journal ArticleDOI
Molecular dynamics model for laser ablation and desorption of organic solids
TL;DR: In this paper, a breathing sphere model is developed for molecular dynamics simulations of laser ablation and desorption of organic solids, and the model provides a plausible description of the ablation of molecular films and matrix-assisted laser desorptions.
Journal ArticleDOI
Threshold behavior in polyimide photoablation: Single-shot rate measurements and surface-temperature modeling
TL;DR: In this article, the ablation rate of Kapton™-type polyimide has been measured as a function of incident fluence and excimer laser wavelength using a sensitive quartz-crystal microbalance (QCM).