Raman spectroscopy of laser shocked polystyrene. (13th October 2016)

• Record Type: Journal Article
• Authors: Rastogi, Vinay; Chaurasia, S.; Rao, Usha; Sijoy, C. D.; Mishra, V.; Kumar, Manmohan; Deo, M. N.; Chaturvedi, S.; Sharma, Surinder M.
• Is Part Of: Journal of Raman spectroscopy. Volume 48:Number 3(2017)
• Page Start: 458
• Page End: 464
• Publication Date: 2016-10-13
• Subjects: polystyrene -- Raman spectroscopy -- laser shock -- Grüneisen parameter -- hydrodynamic simulations; Raman spectroscopy -- Periodicals; 535.846
• DOI: 10.1002/jrs.5046
• Languages: English
• ISSNs: 0377-0486

Abstract

Abstract : We have carried out Raman spectroscopic measurements on atactic polystyrene (aPS) under shock compression up to 2 GPa. Observed wavenumber shifts of Raman active modes have been used to determine their Grüneisen parameters and bond anharmonicities. Raman mode at 798 cm −1 displays maximum blue shift of 4.95 cm −1 /GPa. Our observed wavenumber shifts under shock compression are found to be consistent with the earlier results obtained under hydrostatic pressure. We have also evaluated pressure through 1D radiation hydrodynamic simulations, and the results are found to be in good agreement with the experimental values. The pressure induced wavenumber shifts and line width changes of the present study can be utilized as a gauge for pressure measurement because of laser induced shock front. Copyright © 2016 John Wiley & Sons, Ltd. Abstract : This manuscript reports a Raman study of the dynamic shock compression of polystyrene in confined geometry up to 2 GPa to characterize the various normal modes, Grüneisen parameter and bond anharmonicities. A significant peak shift is observed for 798 cm −1 Raman mode which can be used as a pressure gauge in shock loading and high pressure experiments. The results are found in good agreement with the numerical simulations.