Shock waves in molecular solids: Ultrafast vibrational spectroscopy of the first nanosecond

J. Franken, S. A. Hambir, D. E. Hare, D. D. Dlott

Research output: Contribution to journalArticlepeer-review

Abstract

A novel technique which uses a microfabricated shock target array assembly is described, where the passage of a shock front through a thin (0.5 μm) polycrystalline layer and the subsequent unloading process is monitored in real time with ultrafast coherent Raman spectroscopy. Using a high repetition rate laser shock generation technique, high resolution, coherent Raman spectra are obtained in shocked anthracene and in a high explosive material, NTO, with time resolution of ∼ 50 ps. Spectroscopic measurements are presented which yield the shock pressure (up to 5 GPa), the shock velocity (∼ 4 km/s), the shock front rise-time (tr < 25 ps), and the temperature (∼ 400°C). A brief discussion is presented, how this new technique can be used to determine the Hugoniot, the equation of state, the entropy increase across the shock front, and monitor shock induced chemical reactions in real time.

Original languageEnglish (US)
Pages (from-to)135-145
Number of pages11
JournalShock Waves
Volume7
Issue number3
DOIs
StatePublished - Jan 1 1997

Keywords

  • Laser-driven shock
  • Picosecond spectroscopy
  • Polycrystalline solids
  • Vibrational spectroscopy

ASJC Scopus subject areas

  • Computational Mechanics
  • Mechanics of Materials

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