Abstract
Vibrational spectra up to 8GPa and 600°C were obtained for self-assembled monolayers (SAMs) on noble metal surfaces of the energetic material simulant 4-nitrobenzenethiol (NBT). The high-pressure measurements used a surface-enhanced Raman sensor. The high-temperature measurements used femtosecond laser flash-heating and nonlinear coherent vibrational spectroscopy. The SAM nitro stretching transition νNO2s is insensitive to flash-heating where there is no time for chemical reactivity or thermal expansion. A large pressure broadening in νNO2s of the SAM but not in solid NBT was associated with surface adlayer rearrangement. The implications for time-resolved measurements of shock-compressed energetic materials are discussed.
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