DOI: 10.1177/0003702817726542 1 Time-Resolved Vibrational Spectroscopy of Polytetrafluoroethylene Under Laser-Shock Compression Vinay Rastogi 1, 2 , Usha Rao 1 , S. Chaurasia 1, 2 *, C. D. Sijoy 3 , Vinaya Mishra 3 , Shashank Chaturvedi 4 , M. N. Deo 1, 2 1 High Pressure and Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, Mumbai-400085, India 2 Homi Bhabha National Institute, Mumbai-400094, India 3 Computational Analysis Division, Bhabha Atomic Research Centre, Visakhapatnam, India 4 Institute for Plasma Research, Gandhinagar, Gujarat -382428, India Correponding author: S. Chaurasia, High Pressure and Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, Mumbai-400085, India. Email: shibu@barc.gov.in Abstract Shock-wave-induced high pressure and nanosecond time-resolved Raman spectroscopic experiments were performed to examine the dynamic response of polytetrafluoroethylene (PTFE) in confinement geometry targets. The time-resolved Raman spectroscopy was used to observe the pressure induced molecular and chemical changes on nanosecond time scale. Raman spectra were measured as a function of shock pressure in the 1.2 to 2.4 GPa range. Furthermore, the symmetric stretching mode at 729 cm –1 of CF 2 was compared to corresponding static high pressure measurements carried out in a diamond anvil cell, to see if any general trend can be established. Symmetric stretching mode of CF 2 at 729 cm –1 is the most intense Raman transition in PTFE and found very sensitive to change in pressure. Therefore, it can also be utilized as a