Molecular dynamics model for laser ablation and desorption of organic solids

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

Research output: Contribution to journalArticle

199 Citations (Scopus)

Abstract

A breathing sphere model is developed for molecular dynamics simulations of laser ablation and desorption of organic solids. An approximate representation of the internal molecular motion permits a significant expansion of the time and length scales of the model and still allows one to reproduce a realistic rate of the vibrational relaxation of excited molecules. We find that the model provides a plausible description of the ablation of molecular films and matrix-assisted laser desorption. An apparent threshold fluence has been found to separate two mechanisms for the ejection of molecules: surface vaporization at low laser fluences and collective ejection or ablation at high fluences. Above threshold the laser-induced high pressure and the explosive homogeneous phase transition lead to the strongly forwarded emission of ablated material and high, from 500 up to 1500 m/s, maximum velocities of the ejected plume expansion. Large analyte molecules get axial acceleration from an expanding plume and move along with the matrix molecules at nearly the same velocities. Big molecular clusters are found to constitute a significant part of the ejected plume at fluences right above the ablation threshold. The processes in the plume are found to have a strong influence on the final velocities of ejected molecules and molecular clusters.

Original languageEnglish (US)
Pages (from-to)2028-2037
Number of pages10
JournalJournal of Physical Chemistry B
Volume101
Issue number11
StatePublished - Mar 13 1997

Fingerprint

organic solids
Laser ablation
dynamic models
laser ablation
Molecular dynamics
Dynamic models
Desorption
desorption
plumes
molecular dynamics
fluence
Ablation
Molecules
ablation
molecular clusters
molecules
ejection
thresholds
Lasers
lasers

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Zhigilei, L. V., Kodali, P. B. S., & Garrison, B. J. (1997). Molecular dynamics model for laser ablation and desorption of organic solids. Journal of Physical Chemistry B, 101(11), 2028-2037.
Zhigilei, Leonid V. ; Kodali, Prasad B.S. ; Garrison, Barbara Jane. / Molecular dynamics model for laser ablation and desorption of organic solids. In: Journal of Physical Chemistry B. 1997 ; Vol. 101, No. 11. pp. 2028-2037.
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Zhigilei, LV, Kodali, PBS & Garrison, BJ 1997, 'Molecular dynamics model for laser ablation and desorption of organic solids', Journal of Physical Chemistry B, vol. 101, no. 11, pp. 2028-2037.

Molecular dynamics model for laser ablation and desorption of organic solids. / Zhigilei, Leonid V.; Kodali, Prasad B.S.; Garrison, Barbara Jane.

In: Journal of Physical Chemistry B, Vol. 101, No. 11, 13.03.1997, p. 2028-2037.

Research output: Contribution to journalArticle

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Zhigilei LV, Kodali PBS, Garrison BJ. Molecular dynamics model for laser ablation and desorption of organic solids. Journal of Physical Chemistry B. 1997 Mar 13;101(11):2028-2037.