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1 Mar 1999

Volume 74, Issue 9, pp. 1191-1347

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Molecular dynamics simulation study of the fluence dependence of particle yield and plume composition in laser desorption and ablation of organic solids

Leonid V. Zhigilei and Barbara J. Garrison

Appl. Phys. Lett. 74, 1341 (1999); http://dx.doi.org/10.1063/1.123544 (3 pages) | Cited 45 times

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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. © 1999 American Institute of Physics.
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61.82.Pv Polymers, organic compounds
61.80.Ba Ultraviolet, visible, and infrared radiation effects (including laser radiation)
79.20.Ds Laser-beam impact phenomena
68.03.Fg Evaporation and condensation of liquids
68.43.Mn Adsorption kinetics
79.20.La Photon- and electron-stimulated desorption

Transient grating measurements of picosecond acoustic pulses in metal films

Timothy F. Crimmins, A. A. Maznev, and Keith A. Nelson

Appl. Phys. Lett. 74, 1344 (1999); http://dx.doi.org/10.1063/1.123545 (3 pages) | Cited 15 times

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A transient grating technique is used to detect picosecond acoustic pulses in supported metal films. Crossed femtosecond laser pulses generate acoustic responses with longitudinal components propagating normal to the film plane and surface acoustic wave components propagating in the film plane. Surface “ripple” associated with both components is detected through the diffraction of a probe beam. The measurements yield enhanced information content for characterization of film thickness and mechanical properties. © 1999 American Institute of Physics.
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78.66.Bz Metals and metallic alloys
43.35.Pt Surface waves in solids and liquids
68.35.Gy Mechanical properties; surface strains
78.20.hb Piezo-optical, elasto-optical, acousto-optical, and photoelastic effects
62.65.+k Acoustical properties of solids
78.47.-p Spectroscopy of solid state dynamics
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