Phase transition at low fluences in laser desorption of organic solids: a molecular dynamics study

Prasad B.S. Kodali, Leonid V. Zhigilei, Barbara Jane Garrison

Research output: Contribution to journalConference article

9 Citations (Scopus)

Abstract

Molecular dynamics of a short pulse laser irradiation of a molecular crystal are performed to investigate the dependence of the mechanism of ejection on laser fluence. We find that at low laser fluences molecules are desorbed from a thin surface layer of solid sample. An increase in the laser fluence leads to the melting of the surface region and desorption occurs from an overheated melted state. An additional increase of the fluence leads to the ablation when the laser-induced pressure and phase explosion of the overheated liquid drives a collective ejection of a significant volume of irradiated material.

Original languageEnglish (US)
Pages (from-to)167-171
Number of pages5
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume153
Issue number1-4
DOIs
StatePublished - Jan 1 1999
EventProceedings of the 1998 4th International Conference on Computer Simulation of Radiation Effects in Solids (COSIRES) - Okayama, Jpn
Duration: Sep 15 1998Sep 19 1998

Fingerprint

organic solids
Molecular dynamics
Desorption
fluence
Phase transitions
desorption
molecular dynamics
Lasers
lasers
ejection
Molecular crystals
Laser beam effects
Ablation
Explosions
Melting
ablation
explosions
surface layers
Molecules
melting

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation

Cite this

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abstract = "Molecular dynamics of a short pulse laser irradiation of a molecular crystal are performed to investigate the dependence of the mechanism of ejection on laser fluence. We find that at low laser fluences molecules are desorbed from a thin surface layer of solid sample. An increase in the laser fluence leads to the melting of the surface region and desorption occurs from an overheated melted state. An additional increase of the fluence leads to the ablation when the laser-induced pressure and phase explosion of the overheated liquid drives a collective ejection of a significant volume of irradiated material.",
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Phase transition at low fluences in laser desorption of organic solids : a molecular dynamics study. / Kodali, Prasad B.S.; Zhigilei, Leonid V.; Garrison, Barbara Jane.

In: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, Vol. 153, No. 1-4, 01.01.1999, p. 167-171.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Phase transition at low fluences in laser desorption of organic solids

T2 - a molecular dynamics study

AU - Kodali, Prasad B.S.

AU - Zhigilei, Leonid V.

AU - Garrison, Barbara Jane

PY - 1999/1/1

Y1 - 1999/1/1

N2 - Molecular dynamics of a short pulse laser irradiation of a molecular crystal are performed to investigate the dependence of the mechanism of ejection on laser fluence. We find that at low laser fluences molecules are desorbed from a thin surface layer of solid sample. An increase in the laser fluence leads to the melting of the surface region and desorption occurs from an overheated melted state. An additional increase of the fluence leads to the ablation when the laser-induced pressure and phase explosion of the overheated liquid drives a collective ejection of a significant volume of irradiated material.

AB - Molecular dynamics of a short pulse laser irradiation of a molecular crystal are performed to investigate the dependence of the mechanism of ejection on laser fluence. We find that at low laser fluences molecules are desorbed from a thin surface layer of solid sample. An increase in the laser fluence leads to the melting of the surface region and desorption occurs from an overheated melted state. An additional increase of the fluence leads to the ablation when the laser-induced pressure and phase explosion of the overheated liquid drives a collective ejection of a significant volume of irradiated material.

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