Shock Waves

, Volume 14, Issue 5–6, pp 391–402 | Cite as

Time- and space-resolved studies of shock compression molecular dynamics

  • J. E. Patterson
  • A. S. Lagutchev
  • S. A. Hambir
  • W. Huang
  • H. Yu
  • D. D. Dlott
Original Article

Abstract

Two kinds of experiments are described, that measure the dynamical effects of shock compression on molecules with high time and space resolution. Time resolution is obtained using ultrafast nonlinear coherent vibrational spectroscopy. Space resolution greater than the diffraction limit is obtained by building in nanostructures of known dimensions. In the first experiments, 100 ps laser flash heating is used to suddenly vaporize Al nanoparticles embedded in reactive oxidizing polymers nitrocellulose (NC) and Teflon. The hot nanoparticles react with a surrounding shell of oxidizer and generate spherical shock waves > 10 GPa. The propagation of shock-induced chemistry in time and over distances ranging from 50 to 1,000 nm is measured and discussed. In the second experiment, femtosecond laser-driven planar shock waves run through a molecular monolayer of linear hydrocarbon chains. The methyl –CH3 groups that terminate the chains form a plane ∼1.5 Å thick. The C–H stretching vibrations of these groups are monitored as the shock front passes over. A combination of experiment and molecular simulations shows that chains with odd (15) numbers of carbon atoms become shorter by bending behind the shock front, whereas chains with even numbers (18) of carbon atoms undergo mechanical failure and shorten by forming gauche defects.

Keywords

Laser-driven shock waves Nanoparticles Energetic materials Vibrational spectroscopy 

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • J. E. Patterson
    • 1
  • A. S. Lagutchev
    • 2
  • S. A. Hambir
    • 2
  • W. Huang
    • 2
  • H. Yu
    • 2
  • D. D. Dlott
    • 2
  1. 1.Institute of Shock PhysicsWashington State UniversityPullmanUSA
  2. 2.School of Chemical SciencesUniversity of Illinois at Urbana-ChampaignUrbanaUSA

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