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Raman spectroscopy of poly (methyl methacrylate) under laser shock and static compression
Author(s) -
Chaurasia S.,
Rao Usha,
Mishra Ajay K.,
Sijoy C.D.,
Mishra V.
Publication year - 2020
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.5839
Subject(s) - raman spectroscopy , shock (circulatory) , materials science , compression (physics) , laser , methyl methacrylate , nanosecond , molecular physics , molecular vibration , analytical chemistry (journal) , spectroscopy , optics , chemistry , composite material , organic chemistry , physics , polymerization , medicine , polymer , quantum mechanics
Time‐resolved Raman spectroscopy for visualizing molecular fingerprint snapshots at nanosecond time scale is a useful tool for detailed understanding of in situ shock behaviour of materials. This technique was applied to study the changes in molecular vibrations of poly (methyl methacrylate) (PMMA) under laser driven shock compression up to ~1.9 GPa in a confinement geometry. A layered target configuration is used to enhance the shock pressure. The vibrational modes are measured as a function of dynamic shock and static compression. The Grüneisen parameters and bond anharmonicities in PMMA are determined using compression behaviour of Raman modes. The deduced shock velocity (~3.5 ± 0.4 km/s) in PMMA based on the time evolution of shocked Raman mode at 1.9 GPa is in agreement with the one calculated (~3.7 km/s) from 1‐D radiation hydrodynamic simulations. A comparative study on shock experiment and static high pressure Raman spectroscopic measurements is done. Static pressure measurement up to ~16 GPa show rapid blue shifting of C–H stretching modes.