Sub-picosecond to Sub-nanosecond Vibrational Energy Transfer Dynamics in Pentaerythritol Tetranitrate
| Autor: | Mitchell Wood, Robert Knepper, Neil C. Cole-Filipiak, Krupa Ramasesha |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Phonon Detonation Pentaerythritol tetranitrate 02 engineering and technology Nanosecond 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Chemical physics Picosecond Intramolecular force General Materials Science Density functional theory Physical and Theoretical Chemistry 0210 nano-technology Spectroscopy |
| Zdroj: | The journal of physical chemistry letters. 11(16) |
| ISSN: | 1948-7185 |
| Popis: | The time scale associated with shock-induced detonation is a key property of energetic materials that remains poorly understood. Herein, we test aspects of one potential mechanism, the phonon up-pumping mechanism, where shock compression excites lattice phonon modes, transferring energy to intramolecular vibrations leading to chemical bond cleavage and reaction. Using ultrafast infrared pump–probe spectroscopy on pentaerythritol tetranitrate (PETN), we reveal sub-picosecond vibrational energy transfer (VET) from the photoexcited band at 1660 cm–1 into every other infrared-active mode in the probed frequency range 800–1800 cm–1. Energy transfer processes remain incomplete at 150 ps. Computational predictions from density functional theory are used in tandem to elucidate VET pathways in PETN. |
| Databáze: | OpenAIRE |
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